Quarterly report pursuant to Section 13 or 15(d)

Other Comprehensive Income (Details)

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Other Comprehensive Income (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Pretax        
Total other comprehensive income (loss), pretax $ 79,488,000 $ 65,120,000 $ 138,000,000 $ 180,212,000
Tax (Expense) Benefit        
Total other comprehensive income (loss), tax (expense) benefit (28,053,000) (22,981,000) (48,779,000) (63,120,000)
After-tax        
Non-credit-related impairment losses (recoveries) on debt (equity) securities not expected to be sold, after-tax 6,059,000 (2,835,000) 10,123,000 7,201,000
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale 36,739,000 28,401,000 57,301,000 85,906,000
Net change in unrealized gains (losses) on derivatives used in cash flow hedging relationships, after tax 5,394,000 13,971,000 12,068,000 16,183,000
Change in pension and post-retirement benefit plan assets and liabilities, after-tax 3,243,000 2,602,000 9,729,000 7,802,000
Total other comprehensive income (loss) 51,435,000 42,139,000 89,221,000 117,092,000
Activity in accumulated other comprehensive income, net of tax        
Beginning Balance     (173,763,000) (197,496,000)
Period change     89,221,000 117,092,000
Ending Balance (84,542,000) (80,404,000) (84,542,000) (80,404,000)
Other Comprehensive Income (Textual) [Abstract]        
Unrealized losses transferred from the available for sale securities portfolio to the held to maturity securities 200,000   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, pretax 9,322,000 (4,362,000) 15,574,000 11,079,000
Unrealized holding gains (losses) on debt (equity) securities available for sale arising during the period, pretax 61,074,000 42,832,000 92,436,000 132,575,000
Less: Reclassification adjustment for net losses (gains) losses included in net income, pretax (4,169,000) 1,350,000 (3,906,000) (197,000)
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale, pretax 66,227,000 39,820,000 104,104,000 143,457,000
Tax (Expense) Benefit        
Non-credit-related impairment losses (recoveries) on debt (equity) securities not expected to be sold, tax (expense) benefit (3,263,000) 1,527,000 (5,451,000) (3,878,000)
Unrealized holding gains (losses) on debt (equity) securities available for sale arising during the period, tax (expense) benefit (21,608,000) (15,180,000) (32,831,000) (46,446,000)
Less: Reclassification adjustment for net losses (gains) losses included in net income, tax (expense) benefit 1,459,000 (473,000) 1,367,000 69,000
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale, tax (expense) benefit (23,412,000) (14,126,000) (36,915,000) (50,255,000)
After-tax        
Non-credit-related impairment losses (recoveries) on debt (equity) securities not expected to be sold, after-tax 6,059,000 (2,835,000) 10,123,000 7,201,000
Unrealized holding gains (losses) on debt (equity) securities available for sale arising during the period, after-tax 39,466,000 27,652,000 59,605,000 86,129,000
Less: Reclassification adjustment for net losses (gains) losses included in net income, after-tax (2,710,000) 877,000 (2,539,000) (128,000)
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale 42,815,000 25,694,000 67,189,000 93,202,000
Activity in accumulated other comprehensive income, net of tax        
Beginning Balance     (29,267,000) (101,290,000)
Period change     67,189,000 93,202,000
Ending Balance 37,922,000 (8,088,000) 37,922,000 (8,088,000)
Unrealized gains and losses on equity securities [Member]
        
Pretax        
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale, pretax (26,000) (197,000) 361,000 (145,000)
Tax (Expense) Benefit        
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale, tax (expense) benefit 9,000 69,000 (126,000) 50,000
After-tax        
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale (17,000) (128,000) 235,000 (95,000)
Activity in accumulated other comprehensive income, net of tax        
Beginning Balance     (30,000) (427,000)
Period change     235,000 (95,000)
Ending Balance 205,000 (522,000) 205,000 (522,000)
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 21,595,000 25,338,000 5,139,000 21,102,000
Less: Reclassification adjustment for net losses (gains) losses included in net income, pretax (13,298,000) (3,844,000) 13,428,000 3,795,000
Net change in unrealized gains (losses) on derivatives used in cash flow hedging relationships, pretax 8,297,000 21,494,000 18,567,000 24,897,000
Tax (Expense) Benefit        
Unrealized gains and losses on derivatives used in cash flow hedging relationships arising during the period, tax (expense) benefit (7,568,000) (8,868,000) (1,810,000) (7,374,000)
Less: Reclassification adjustment for net losses (gains) losses included in net income, tax (expense) benefit 4,665,000 1,345,000 (4,689,000) (1,340,000)
Net change in unrealized gains (losses) on derivatives used in cash flow hedging relationships, tax (expense) benefit (2,903,000) (7,523,000) (6,499,000) (8,714,000)
After-tax        
Unrealized gains and losses on derivatives used in cash flow hedging relationships arising during the period, after-tax 14,027,000 16,470,000 3,329,000 13,728,000
Less: Reclassification adjustment for net losses (gains) losses included in net income, after tax (8,633,000) (2,499,000) 8,739,000 2,455,000
Net change in unrealized gains (losses) on derivatives used in cash flow hedging relationships, after tax 5,394,000 13,971,000 12,068,000 16,183,000
Activity in accumulated other comprehensive income, net of tax        
Beginning Balance     40,898,000 35,710,000
Period change     12,068,000 16,183,000
Ending Balance 52,966,000 51,893,000 52,966,000 51,893,000
Accumulated Unrealized Losses for Pension and Other Post-retirement obligations [Member]
        
Pretax        
Change in pension and post-retirement benefit plan assets and liabilities, pretax 4,990,000 4,003,000 14,968,000 12,003,000
Tax (Expense) Benefit        
Change in pension and post-retirement benefit plan assets and liabilities, tax (expense) benefit (1,747,000) (1,401,000) (5,239,000) (4,201,000)
After-tax        
Change in pension and post-retirement benefit plan assets and liabilities, after-tax 3,243,000 2,602,000 9,729,000 7,802,000
Activity in accumulated other comprehensive income, net of tax        
Beginning Balance     (185,364,000) (131,489,000)
Period change     9,729,000 7,802,000
Ending Balance $ (175,635,000) $ (123,687,000) $ (175,635,000) $ (123,687,000)