Quarterly report pursuant to Section 13 or 15(d)

Other Comprehensive Income (Activity/Rollforward) (Details)

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Other Comprehensive Income (Activity/Rollforward) (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Pretax          
Total other comprehensive income (loss), pretax $ (190,920,000) $ 33,689,000 $ (204,924,000) $ 58,511,000  
Tax (Expense) Benefit          
Total other comprehensive income (loss), tax (expense) benefit 67,139,000 (11,850,000) 72,005,000 (20,725,000)  
After-tax          
Non-credit-related impairment losses (recoveries) on debt (equity) securities not expected to be sold, after-tax 3,945,000 (463,000) 7,754,000 4,064,000  
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale (76,664,000) 2,716,000 (81,989,000) 20,562,000  
Net change in unrealized gains (losses) on derivatives used in cash flow hedging relationships, after tax (56,410,000) 16,343,000 (69,380,000) 6,674,000  
Change in pension and post-retirement benefit plan assets and liabilities, after-tax 5,348,000 3,243,000 10,696,000 6,486,000  
Total other comprehensive income (loss) (123,781,000) 21,839,000 (132,919,000) 37,786,000  
Activity in accumulated other comprehensive income, net of tax          
Beginning Balance     (150,817,000)    
Period change     (132,919,000)    
OCI before reclassifications     (138,896,000)    
Amounts reclassified from accumulated OCI     5,977,000    
Ending Balance (283,736,000)   (283,736,000)    
Other Comprehensive Income (Textual) [Abstract]          
Unrealized losses transferred from the available for sale securities portfolio to the held to maturity securities 100,000   100,000   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, before-tax 6,102,000 (713,000) 11,996,000 6,252,000  
Unrealized holding gains (losses) on debt (equity) securities available for sale arising during the period, pretax (119,321,000) 4,575,000 (128,019,000) 31,362,000  
Less: Reclassification adjustment for net losses (gains) losses included in net income, pretax 926,000 (350,000) 1,231,000 263,000  
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale, pretax (112,293,000) 3,512,000 (114,792,000) 37,877,000  
Tax (Expense) Benefit          
Non-credit-related impairment losses (recoveries) on debt (equity) securities not expected to be sold, tax (expense) benefit (2,157,000) 250,000 (4,242,000) (2,188,000)  
Unrealized holding gains (losses) on debt (equity) securities available for sale arising during the period, tax (expense) benefit 42,105,000 (1,661,000) 45,138,000 (11,223,000)  
Less: Reclassification adjustment for net losses (gains) losses included in net income, tax (expense) benefit (327,000) 123,000 435,000 92,000  
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale, tax (expense) benefit 39,621,000 (1,288,000) (40,461,000) 13,503,000  
After-tax          
Non-credit-related impairment losses (recoveries) on debt (equity) securities not expected to be sold, after-tax 3,945,000 (463,000) 7,754,000 4,064,000  
Unrealized holding gains (losses) on debt (equity) securities available for sale arising during the period, after-tax (77,216,000) 2,914,000 (82,881,000) 20,139,000  
Less: Reclassification adjustment for net losses (gains) losses included in net income, after-tax 599,000 (227,000) 796,000 171,000  
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale (72,672,000) 2,224,000 (74,331,000) 24,374,000  
Activity in accumulated other comprehensive income, net of tax          
Beginning Balance     38,304,000    
Period change     (74,331,000)    
OCI before reclassifications     (75,127,000)    
Amounts reclassified from accumulated OCI     796,000    
Ending Balance (36,027,000)   (36,027,000)    
Unrealized gains and losses on equity securities [Member]
          
Pretax          
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale, pretax (68,000) 44,000 152,000 387,000  
Tax (Expense) Benefit          
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale, tax (expense) benefit 21,000 (15,000) 56,000 135,000  
After-tax          
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale (47,000) 29,000 96,000 252,000  
Activity in accumulated other comprehensive income, net of tax          
Beginning Balance     194,000    
Period change     96,000    
OCI before reclassifications     96,000    
Amounts reclassified from accumulated OCI     0    
Ending Balance 290,000   290,000    
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 (82,327,000) 23,211,000 (98,254,000) (16,457,000)  
Less: Reclassification adjustment for net losses (gains) losses included in net income, pretax (4,459,000) 1,932,000 (8,485,000) 26,725,000  
Net change in unrealized gains (losses) on derivatives used in cash flow hedging relationships, pretax (86,786,000) 25,143,000 (106,739,000) 10,268,000  
Tax (Expense) Benefit          
Unrealized gains and losses on derivatives used in cash flow hedging relationships arising during the period, tax (expense) benefit 28,815,000 (8,117,000) 34,389,000 5,759,000  
Less: Reclassification adjustment for net losses (gains) losses included in net income, tax (expense) benefit 1,561,000 (683,000) 2,970,000 (9,353,000)  
Net change in unrealized gains (losses) on derivatives used in cash flow hedging relationships 30,376,000 (8,800,000) 37,359,000 (3,594,000)  
After-tax          
Unrealized gains and losses on derivatives used in cash flow hedging relationships arising during the period, after-tax (53,512,000) 15,094,000 (63,865,000) (10,698,000)  
Less: Reclassification adjustment for net losses (gains) losses included in net income, after-tax (2,898,000) 1,249,000 (5,515,000) 17,372,000  
Net change in unrealized gains (losses) on derivatives used in cash flow hedging relationships, after tax (56,410,000) 16,343,000 (69,380,000) 6,674,000  
Activity in accumulated other comprehensive income, net of tax          
Beginning Balance     47,084,000    
Period change     (69,380,000)    
OCI before reclassifications     (63,865,000)    
Amounts reclassified from accumulated OCI     (5,515,000)    
Ending Balance (22,296,000)   (22,296,000)    
Accumulated Unrealized Losses for Pension and Other Post-retirement obligations [Member]
          
Pretax          
Amortization of net actuarial loss and prior service cost included in income, pretax 8,227,000 4,990,000 16,455,000 9,979,000  
Tax (Expense) Benefit          
Amortization of net actuarial loss and prior service cost included in income, tax (expense) benefit (2,879,000) (1,747,000) (5,759,000) (3,493,000)  
After-tax          
Amortization of net actuarial loss and prior service cost included in income, net of tax 5,348,000 3,243,000 10,696,000 6,486,000  
Activity in accumulated other comprehensive income, net of tax          
Beginning Balance     (236,399,000)    
Period change     10,696,000    
OCI before reclassifications     0    
Amounts reclassified from accumulated OCI     10,696,000    
Ending Balance $ (225,703,000)   $ (225,703,000)