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
Mar. 31, 2013
Mar. 31, 2012
Pretax    
Total other comprehensive income (loss), pretax $ (14,007,000) $ 24,821,000
Tax (Expense) Benefit    
Total other comprehensive income (loss), tax (expense) benefit 4,869,000 (8,874,000)
After-tax    
Non-credit-related impairment losses (recoveries) on debt (equity) securities not expected to be sold, after-tax 3,831,000 4,527,000
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale (5,347,000) 17,846,000
Net change in unrealized gains (losses) on derivatives used in cash flow hedging relationships, after tax (12,970,000) (9,669,000)
Change in pension and post-retirement benefit plan assets and liabilities, after-tax 5,348,000 3,243,000
Total other comprehensive income (loss) (9,138,000) 15,947,000
Activity in accumulated other comprehensive income, net of tax    
Beginning Balance (150,817,000) (173,763,000)
Period change (9,138,000) 15,947,000
OCI before reclassifications (12,165,000)  
Amounts reclassified from accumulated OCI 3,027,000  
Ending Balance (159,955,000) (157,816,000)
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 5,894,000 6,964,000
Unrealized holding gains (losses) on debt (equity) securities available for sale arising during the period, pretax (8,847,000) 26,788,000
Less: Reclassification adjustment for net losses (gains) losses included in net income, pretax 454,000 613,000
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale, pretax (2,499,000) 34,365,000
Tax (Expense) Benefit    
Non-credit-related impairment losses (recoveries) on debt (equity) securities not expected to be sold, tax (expense) benefit (2,063,000) (2,437,000)
Unrealized holding gains (losses) on debt (equity) securities available for sale arising during the period, tax (expense) benefit 3,062,000 (9,563,000)
Less: Reclassification adjustment for net losses (gains) losses included in net income, tax (expense) benefit (159,000) (215,000)
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale, tax (expense) benefit 840,000 (12,215,000)
After-tax    
Non-credit-related impairment losses (recoveries) on debt (equity) securities not expected to be sold, after-tax 3,831,000 4,527,000
Unrealized holding gains (losses) on debt (equity) securities available for sale arising during the period, after-tax (5,785,000) 17,225,000
Less: Reclassification adjustment for net losses (gains) losses included in net income, after-tax 295,000 398,000
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale (1,659,000) 22,150,000
Activity in accumulated other comprehensive income, net of tax    
Beginning Balance 38,304,000 (29,267,000)
Period change (1,659,000) 22,150,000
OCI before reclassifications (1,954,000)  
Amounts reclassified from accumulated OCI 295,000  
Ending Balance 36,645,000 (7,117,000)
Unrealized gains and losses on equity securities [Member]
    
Pretax    
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale, pretax 220,000 343,000
Tax (Expense) Benefit    
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale, tax (expense) benefit (77,000) (120,000)
After-tax    
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale 143,000 223,000
Activity in accumulated other comprehensive income, net of tax    
Beginning Balance 194,000 (30,000)
Period change 143,000 223,000
OCI before reclassifications 143,000  
Amounts reclassified from accumulated OCI 0  
Ending Balance 337,000 193,000
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 (15,929,000) (39,669,000)
Less: Reclassification adjustment for net losses (gains) losses included in net income, pretax (4,026,000) 24,793,000
Net change in unrealized gains (losses) on derivatives used in cash flow hedging relationships, pretax (19,955,000) (14,876,000)
Tax (Expense) Benefit    
Unrealized gains and losses on derivatives used in cash flow hedging relationships arising during the period, tax (expense) benefit 5,575,000 13,877,000
Less: Reclassification adjustment for net losses (gains) losses included in net income, tax (expense) benefit 1,410,000 (8,670,000)
Net change in unrealized gains (losses) on derivatives used in cash flow hedging relationships 6,985,000 5,207,000
After-tax    
Unrealized gains and losses on derivatives used in cash flow hedging relationships arising during the period, after-tax (10,354,000) (25,792,000)
Less: Reclassification adjustment for net losses (gains) losses included in net income, after-tax (2,616,000) 16,123,000
Net change in unrealized gains (losses) on derivatives used in cash flow hedging relationships, after tax (12,970,000) (9,669,000)
Activity in accumulated other comprehensive income, net of tax    
Beginning Balance 47,084,000 40,898,000
Period change (12,970,000) (9,669,000)
OCI before reclassifications (10,354,000)  
Amounts reclassified from accumulated OCI (2,616,000)  
Ending Balance 34,114,000 31,229,000
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 4,989,000
Tax (Expense) Benefit    
Amortization of net actuarial loss and prior service cost included in income, tax (expense) benefit (2,879,000) (1,746,000)
After-tax    
Amortization of net actuarial loss and prior service cost included in income, net of tax 5,348,000 3,243,000
Activity in accumulated other comprehensive income, net of tax    
Beginning Balance (236,399,000) (185,364,000)
Period change 5,348,000 3,243,000
OCI before reclassifications 0  
Amounts reclassified from accumulated OCI 5,348,000  
Ending Balance $ (231,051,000) $ (182,121,000)