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
Mar. 31, 2012
Mar. 31, 2011
Pretax    
Total other comprehensive income (loss), pretax $ 24,821,000 $ (9,842,000)
Tax (Expense) Benefit    
Total other comprehensive income (loss), tax (expense) benefit (8,874,000) 3,417,000
After-tax    
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale 17,846,000 (3,730,000)
Change in pension and post-retirement benefit plan assets and liabilities, after-tax 3,243,000 2,600,000
Total other comprehensive income (loss) 15,947,000 (6,425,000)
Activity in accumulated other comprehensive income, net of tax    
Beginning Balance (173,763,000) (197,496,000)
Period change   (6,425,000)
Ending Balance (157,816,000) (203,921,000)
Other Comprehensive Income (Textual) [Abstract]    
Unrealized losses transferred from the available for sale securities portfolio to the held to maturity securities 300,000  
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 6,964,000 14,041,000
Unrealized holding gains (losses) on debt (equity) securities available for sale arising during the period, pretax 26,788,000 (5,725,000)
Less: Reclassification adjustment for net losses (gains) losses included in net income, pretax 613,000 (40,000)
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale, pretax 34,365,000 8,276,000
Tax (Expense) Benefit    
Non-credit-related impairment losses (recoveries) on debt (equity) securities not expected to be sold, tax (expense) benefit (2,437,000) (4,914,000)
Unrealized holding gains (losses) on debt (equity) securities available for sale arising during the period, tax (expense) benefit (9,563,000) 1,975,000
Less: Reclassification adjustment for net losses (gains) losses included in net income, tax (expense) benefit (215,000) 14,000
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale, tax (expense) benefit (12,215,000) (2,925,000)
After-tax    
Non-credit-related impairment losses (recoveries) on debt (equity) securities not expected to be sold, after-tax 4,527,000 9,127,000
Unrealized holding gains (losses) on debt (equity) securities available for sale arising during the period, after-tax 17,225,000 (3,750,000)
Less: Reclassification adjustment for net losses (gains) losses included in net income, after-tax 398,000 (26,000)
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale 22,150,000 5,351,000
Activity in accumulated other comprehensive income, net of tax    
Beginning Balance (29,267,000) (101,290,000)
Period change   5,351,000
Ending Balance   (95,939,000)
Unrealized gains and losses on equity securities [Member]
    
Pretax    
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale, pretax 343,000 70,000
Tax (Expense) Benefit    
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale, tax (expense) benefit (120,000) (24,000)
After-tax    
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale 223,000 46,000
Activity in accumulated other comprehensive income, net of tax    
Beginning Balance (30,000) (427,000)
Period change   46,000
Ending Balance   (381,000)
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 (14,876,000) (22,188,000)
Tax (Expense) Benefit    
Unrealized gains and losses on derivatives used in cash flow hedging relationships arising during the period, tax (expense) benefit 5,207,000 7,766,000
After-tax    
Unrealized gains and losses on derivatives used in cash flow hedging relationships arising during the period, after-tax (9,669,000) (14,422,000)
Activity in accumulated other comprehensive income, net of tax    
Beginning Balance 40,898,000 35,710,000
Period change   (14,422,000)
Ending Balance   21,288,000
Accumulated Unrealized Losses for Pension and Other Post-retirement obligations [Member]
    
Pretax    
Change in pension and post-retirement benefit plan assets and liabilities, pretax 4,989,000 4,000,000
Tax (Expense) Benefit    
Change in pension and post-retirement benefit plan assets and liabilities, tax (expense) benefit (1,746,000) (1,400,000)
After-tax    
Change in pension and post-retirement benefit plan assets and liabilities, after-tax 3,243,000 2,600,000
Activity in accumulated other comprehensive income, net of tax    
Beginning Balance (185,364,000) (131,489,000)
Period change   2,600,000
Ending Balance   $ (128,889,000)