Annual report pursuant to Section 13 and 15(d)

Other Comprehensive Income (Details)

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Other Comprehensive Income (Details) (USD $)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Pretax      
Total other comprehensive income (loss), pretax $ 36,110,000 $ 36,513,000 $ (55,703,000)
Tax (Expense) Benefit      
Total other comprehensive income (loss), tax (expense) benefit (13,164,000) (12,780,000) 19,441,000
After-tax      
Cumulative effect of change in accounting principle for OTTI debt securities, after-tax     (4,249,000)
Non-credit-related impairment losses (recoveries) on debt (equity) securities not expected to be sold, after-tax 12,490,000 7,499,000 15,320,000
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale 55,305,000 64,921,000 (9,406,000)
Net change in unrealized gains (losses) on derivatives used in cash flow hedging relationships, after tax 6,186,000 5,188,000 (23,155,000)
Change in pension and post-retirement benefit plan assets and liabilities, after-tax (51,035,000) (53,875,000) (19,021,000)
Total other comprehensive income (loss) 22,946,000 23,733,000 (36,262,000)
Activity in accumulated other comprehensive income, net of tax      
Beginning Balance (173,763,000) (197,496,000) (156,985,000)
Cumulative effect of change in accounting principle for OTTI debt securities, net of tax     (4,249,000)
Period change 22,946,000 23,733,000 (36,262,000)
Ending Balance (150,817,000) (173,763,000) (197,496,000)
Other Comprehensive Income (Textual) [Abstract]      
Unrealized losses transferred from the available for sale securities portfolio to the held to maturity securities 200,000    
Unrealized gains and losses on debt securities [Member]
     
Pretax      
Non-credit-related impairment losses (recoveries) on debt (equity) securities not expected to be sold, before-tax 19,215,000 11,537,000 23,569,000
Unrealized holding gains (losses) on debt (equity) securities available for sale arising during the period, pretax 90,318,000 95,586,000 (14,498,000)
Less: Reclassification adjustment for net losses (gains) losses included in net income, pretax (4,769,000) 3,681,000 274,000
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale, pretax 104,764,000 110,804,000 9,345,000
Tax (Expense) Benefit      
Non-credit-related impairment losses (recoveries) on debt (equity) securities not expected to be sold, tax (expense) benefit (6,725,000) (4,038,000) (8,249,000)
Unrealized holding gains (losses) on debt (equity) securities available for sale arising during the period, tax (expense) benefit (32,137,000) (33,455,000) 5,019,000
Less: Reclassification adjustment for net losses (gains) losses included in net income, tax (expense) benefit 1,669,000 (1,288,000) (96,000)
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale, tax (expense) benefit (37,193,000) (38,781,000) (3,326,000)
After-tax      
Cumulative effect of change in accounting principle for OTTI debt securities, after-tax     (4,249,000)
Non-credit-related impairment losses (recoveries) on debt (equity) securities not expected to be sold, after-tax 12,490,000 7,499,000 15,320,000
Unrealized holding gains (losses) on debt (equity) securities available for sale arising during the period, after-tax 58,181,000 62,131,000 (9,479,000)
Less: Reclassification adjustment for net losses (gains) losses included in net income, after-tax (3,100,000) 2,393,000 178,000
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale 67,571,000 72,023,000 6,019,000
Activity in accumulated other comprehensive income, net of tax      
Beginning Balance (29,267,000) (101,290,000) (103,060,000)
Cumulative effect of change in accounting principle for OTTI debt securities, net of tax     (4,249,000)
Period change 67,571,000 72,023,000 6,019,000
Ending Balance 38,304,000 (29,267,000) (101,290,000)
Unrealized gains and losses on equity securities [Member]
     
Pretax      
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale, pretax 344,000 612,000 (162,000)
Tax (Expense) Benefit      
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale, tax (expense) benefit (120,000) (215,000) 57,000
After-tax      
Cumulative effect of change in accounting principle for OTTI debt securities, after-tax     0
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale 224,000 397,000 (105,000)
Activity in accumulated other comprehensive income, net of tax      
Beginning Balance (30,000) (427,000) (322,000)
Cumulative effect of change in accounting principle for OTTI debt securities, net of tax     0
Period change 224,000 397,000 (105,000)
Ending Balance 194,000 (30,000) (427,000)
Unrealized gains and losses on cash flow hedging derivatives [Member]
     
Pretax      
Unrealized gains and losses on derivatives used in cash flow hedging relationships arising during the period, pretax (5,476,000) 4,875,000 80,069,000
Less: Reclassification adjustment for net losses (gains) losses included in net income, pretax 14,992,000 3,107,000 (115,692,000)
Net change in unrealized gains (losses) on derivatives used in cash flow hedging relationships, pretax 9,516,000 7,982,000 (35,623,000)
Tax (Expense) Benefit      
Unrealized gains and losses on derivatives used in cash flow hedging relationships arising during the period, tax (expense) benefit 1,907,000 (1,703,000) (28,126,000)
Less: Reclassification adjustment for net losses (gains) losses included in net income, tax (expense) benefit (5,237,000) (1,091,000) 40,594,000
Net change in unrealized gains (losses) on derivatives used in cash flow hedging relationships (3,330,000) (2,794,000) 12,468,000
After-tax      
Cumulative effect of change in accounting principle for OTTI debt securities, after-tax     0
Unrealized gains and losses on derivatives used in cash flow hedging relationships arising during the period, after-tax (3,569,000) 3,172,000 51,943,000
Less: Reclassification adjustment for net losses (gains) losses included in net income, after-tax 9,755,000 2,016,000 (75,098,000)
Net change in unrealized gains (losses) on derivatives used in cash flow hedging relationships, after tax 6,186,000 5,188,000 (23,155,000)
Activity in accumulated other comprehensive income, net of tax      
Beginning Balance 40,898,000 35,710,000 58,865,000
Cumulative effect of change in accounting principle for OTTI debt securities, net of tax     0
Period change 6,186,000 5,188,000 (23,155,000)
Ending Balance 47,084,000 40,898,000 35,710,000
Accumulated Unrealized Losses for Pension and Other Post-retirement obligations [Member]
     
Pretax      
Net actuarial gains (losses) arising during the year, pretax (105,527,000) (104,146,000) (45,804,000)
Amortization of net actuarial loss and prior service cost included in income, pretax 27,013,000 21,261,000 16,541,000
Change in pension and post-retirement benefit plan assets and liabilities, pretax (78,514,000) (82,885,000) (29,263,000)
Tax (Expense) Benefit      
Net actuarial gains (losses) arising during the year, tax (expense) benefit 36,934,000 36,451,000 16,031,000
Amortization of net actuarial loss and prior service cost included in income, tax (expense) benefit (9,455,000) (7,441,000) (5,789,000)
Change in pension and post-retirement benefit plan assets and liabilities, tax (expense) benefit 27,479,000 29,010,000 10,242,000
After-tax      
Cumulative effect of change in accounting principle for OTTI debt securities, after-tax     0
Net actuarial gains (losses) arising during the year, net of tax (68,593,000) (67,695,000) (29,773,000)
Amortization of net actuarial loss and prior service cost included in income, net of tax 17,558,000 13,820,000 10,752,000
Change in pension and post-retirement benefit plan assets and liabilities, after-tax (51,035,000) (53,875,000) (19,021,000)
Activity in accumulated other comprehensive income, net of tax      
Beginning Balance (185,364,000) (131,489,000) (112,468,000)
Cumulative effect of change in accounting principle for OTTI debt securities, net of tax     0
Period change (51,035,000) (53,875,000) (19,021,000)
Ending Balance $ (236,399,000) $ (185,364,000) $ (131,489,000)