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 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Components of other comprehensive income        
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale, after-tax     $ 57,504,000 $ 69,779,000
Unrealized gains and losses on derivatives used in cash flow hedging relationships arising during the period, pretax 25,590,000 (3,883,000) 3,404,000 1,190,000
Unrealized gains and losses on derivatives used in cash flow hedging relationships arising during the period, tax (expense) benefit (8,956,000) 1,359,000 (1,192,000) (416,000)
Unrealized gains and losses on derivatives used in cash flow hedging relationships arising during the period, after-tax 16,634,000 (2,524,000) 2,212,000 774,000
Change in pension and post-retirement benefit plan assets and liabilities, pretax 4,000,000 1,794,000 8,000,000 3,588,000
Change in pension and post-retirement benefit plan assets and liabilities, tax (expense) benefit (1,400,000) (628,000) (2,800,000) (1,256,000)
Change in pension and post-retirement benefit plan assets and liabilities, after-tax 2,600,000 1,166,000 5,200,000 2,332,000
Total other comprehensive income (loss), pretax 124,933,000 75,920,000 115,093,000 112,462,000
Total other comprehensive income (loss), tax (expense) benefit (43,555,000) (26,845,000) (40,140,000) (39,875,000)
Total other comprehensive income (loss), after-tax 81,378,000 49,075,000 74,953,000 72,587,000
Cumulative effect of change in accounting principle for consolidation of variable interest entities, after-tax       (4,249,000)
Activity in accumulated other comprehensive income, net of tax        
Beginning Balance     (197,496,000) (156,985,000)
Cumulative effect of change in accounting principle for consolidation of variable interest entities       (4,249,000)
Period change     74,953,000 76,836,000
Ending Balance (122,543,000) (84,398,000) (122,543,000) (84,398,000)
Other Comprehensive Income (Textual) [Abstract]        
Unrealized losses transferred from the available for sale securities portfolio to the held to maturity securities 500,000   500,000  
Equity Securities [Member]
        
Components of other comprehensive income        
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale, pretax (18,000) (206,000) 52,000 (185,000)
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale, tax (expense) benefit 6,000 72,000 (19,000) 65,000
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale, after-tax (12,000) (134,000) 33,000 (120,000)
Debt Securities [Member]
        
Components of other comprehensive income        
Non-credit-related impairment losses (recoveries) on debt (equity) securities not expected to be sold, pretax 1,400,000 8,017,000 15,441,000 6,078,000
Non-credit-related impairment losses (recoveries) on debt (equity) securities not expected to be sold, tax (expense) benefit (490,000) (2,806,000) (5,404,000) (2,127,000)
Non-credit-related impairment losses (recoveries) on debt (equity) securities not expected to be sold, after-tax 910,000 5,211,000 10,037,000 3,951,000
Unrealized holding gains (losses) on debt (equity) securities available for sale arising during the period, pretax 95,468,000 70,354,000 89,743,000 108,281,000
Unrealized holding gains (losses) on debt (equity) securities available for sale arising during the period, tax (expense) benefit (33,242,000) (24,897,000) (31,266,000) (38,301,000)
Unrealized holding gains (losses) on debt (equity) securities available for sale arising during the period, after-tax 62,226,000 45,457,000 58,477,000 69,980,000
Less: Reclassification adjustment for net losses (gains) losses included in net income, pretax (1,507,000) (156,000) (1,547,000) (125,000)
Less: Reclassification adjustment for net losses (gains) losses included in net income, tax (expense) benefit 527,000 55,000 541,000 44,000
Less: Reclassification adjustment for net losses (gains) losses included in net income, after-tax (980,000) (101,000) (1,006,000) (81,000)
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale, pretax 95,361,000 78,215,000 103,637,000 114,234,000
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale, tax (expense) benefit (33,205,000) (27,648,000) (36,129,000) (40,384,000)
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale, after-tax 62,156,000 50,567,000 67,508,000 73,850,000
Cumulative effect of change in accounting principle for consolidation of variable interest entities pretax       (6,365,000)
Cumulative effect of change in accounting principle for consolidation of variable interest entities, after-tax       (4,249,000)
Cumulative effect of change in accounting principle for consolidation of variable interest entities, tax (expense) benefit       2,116,000
Activity in accumulated other comprehensive income, net of tax        
Cumulative effect of change in accounting principle for consolidation of variable interest entities       (4,249,000)
Unrealized gains and losses on debt securities [Member]
        
Components of other comprehensive income        
Cumulative effect of change in accounting principle for consolidation of variable interest entities, after-tax       (4,249,000)
Activity in accumulated other comprehensive income, net of tax        
Beginning Balance     (101,290,000) (103,060,000)
Cumulative effect of change in accounting principle for consolidation of variable interest entities       (4,249,000)
Period change     67,508,000 73,850,000
Ending Balance (33,782,000) (33,459,000) (33,782,000) (33,459,000)
Unrealized gains and losses on equity securities [Member]
        
Activity in accumulated other comprehensive income, net of tax        
Beginning Balance     (427,000) (322,000)
Period change     33,000 (120,000)
Ending Balance (394,000) (442,000) (394,000) (442,000)
Unrealized gains and losses on cash flow hedging derivatives [Member]
        
Activity in accumulated other comprehensive income, net of tax        
Beginning Balance     35,710,000 58,865,000
Period change     2,212,000 774,000
Ending Balance 37,922,000 59,639,000 37,922,000 59,639,000
Accumulated Unrealized Losses for Pension and Other Post-retirement obligations [Member]
        
Activity in accumulated other comprehensive income, net of tax        
Beginning Balance     (131,489,000) (112,468,000)
Period change     5,200,000 2,332,000
Ending Balance $ (126,289,000) $ (110,136,000) $ (126,289,000) $ (110,136,000)