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 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended 9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Equity Securities [Member]
Sep. 30, 2010
Equity Securities [Member]
Sep. 30, 2011
Equity Securities [Member]
Sep. 30, 2010
Equity Securities [Member]
Sep. 30, 2011
Debt Securities [Member]
Sep. 30, 2010
Debt Securities [Member]
Sep. 30, 2011
Debt Securities [Member]
Sep. 30, 2010
Debt Securities [Member]
Sep. 30, 2010
Unrealized gains and losses on debt securities [Member]
Dec. 31, 2010
Unrealized gains and losses on debt securities [Member]
Sep. 30, 2010
Unrealized gains and losses on equity securities [Member]
Dec. 31, 2010
Unrealized gains and losses on equity securities [Member]
Sep. 30, 2010
Unrealized gains and losses on cash flow hedging derivatives [Member]
Dec. 31, 2010
Unrealized gains and losses on cash flow hedging derivatives [Member]
Sep. 30, 2010
Accumulated Unrealized Losses for Pension and Other Post-retirement obligations [Member]
Dec. 31, 2010
Accumulated Unrealized Losses for Pension and Other Post-retirement obligations [Member]
Pretax                                        
Cumulative effect of change in accounting principle for consolidation of variable interest entities pretax                       $ (6,365,000)                
Non-credit-related impairment losses (recoveries) on debt (equity) securities not expected to be sold, pretax                 4,362,000 30,492,000 11,079,000 36,570,000                
Unrealized holding gains (losses) on debt (equity) securities available for sale arising during the period, pretax                 42,832,000 28,767,000 132,575,000 137,051,000                
Less: Reclassification adjustment for net losses (gains) losses included in net income, pretax                 1,350,000 296,000 (197,000) 171,000                
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale, pretax         (197,000) (53,000) (145,000) (241,000) 39,820,000 59,555,000 143,457,000 173,792,000                
Unrealized gains and losses on derivatives used in cash flow hedging relationships arising during the period, pretax 21,494,000 25,180,000 24,897,000 26,371,000                                
Change in pension and post-retirement benefit plan assets and liabilities, pretax 4,003,000 1,794,000 12,003,000 5,382,000                                
Total other comprehensive income (loss), pretax 65,120,000 86,476,000 180,212,000 198,939,000                                
Tax (Expense) Benefit                                        
Cumulative effect of change in accounting principle for consolidation of variable interest entities, tax (expense) benefit                       2,116,000                
Non-credit-related impairment losses (recoveries) on debt (equity) securities not expected to be sold, tax (expense) benefit                 1,527,000 (10,672,000) (3,878,000) (12,799,000)                
Unrealized holding gains (losses) on debt (equity) securities available for sale arising during the period, tax (expense) benefit                 (15,180,000) (10,276,000) (46,446,000) (48,578,000)                
Less: Reclassification adjustment for net losses (gains) losses included in net income, tax (expense) benefit                 (473,000) (104,000) 69,000 (60,000)                
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale, tax (expense) benefit         69,000 19,000 50,000 85,000 (14,126,000) (21,052,000) (50,255,000) (61,437,000)                
Unrealized gains and losses on derivatives used in cash flow hedging relationships arising during the period, tax (expense) benefit (7,523,000) (8,813,000) (8,714,000) (9,230,000)                                
Change in pension and post-retirement benefit plan assets and liabilities, tax (expense) benefit (1,401,000) (628,000) (4,201,000) (1,884,000)                                
Total other comprehensive income (loss), tax (expense) benefit (22,981,000) (30,474,000) (63,120,000) (70,350,000)                                
After-tax                                        
Cumulative effect of change in accounting principle for consolidation of variable interest entities, after-tax       (4,249,000)               (4,249,000) (4,249,000)   0   0   0  
Non-credit-related impairment losses (recoveries) on debt (equity) securities not expected to be sold, after-tax                 (2,835,000) 19,820,000 7,201,000 23,771,000                
Unrealized holding gains (losses) on debt (equity) securities available for sale arising during the period, after-tax                 27,652,000 18,491,000 86,129,000 88,473,000                
Less: Reclassification adjustment for net losses (gains) losses included in net income, after-tax                 877,000 192,000 (128,000) 111,000                
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale, after-tax     85,906,000 88,428,000 (128,000) (34,000) (95,000) (156,000) 25,694,000 38,503,000 93,202,000 112,355,000                
Unrealized gains and losses on derivatives used in cash flow hedging relationships arising during the period, after-tax 13,971,000 16,367,000 16,183,000 17,141,000                                
Change in pension and post-retirement benefit plan assets and liabilities, after-tax 2,602,000 1,166,000 7,802,000 3,498,000                                
Total other comprehensive income (loss), after-tax 42,139,000 56,002,000 117,092,000 128,589,000                                
Activity in accumulated other comprehensive income, net of tax                                        
Beginning Balance     (197,496,000) (156,985,000)                 (103,060,000) (101,290,000) (322,000) (427,000) 58,865,000 35,710,000 (112,468,000) (131,489,000)
Cumulative effect of change in accounting principle for consolidation of variable interest entities       (4,249,000)               (4,249,000) (4,249,000)   0   0   0  
Period change       132,838,000                 112,355,000   (156,000)   17,141,000   3,498,000  
Ending Balance (80,404,000) (28,396,000) (80,404,000) (28,396,000)                 5,046,000 (101,290,000) (478,000) (427,000) 76,006,000 35,710,000 (108,970,000) (131,489,000)
Other Comprehensive Income (Textual) [Abstract]                                        
Unrealized losses transferred from the available for sale securities portfolio to the held to maturity securities $ 400,000   $ 400,000