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 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Pretax          
Total other comprehensive income (loss), pretax $ 81,712,000 $ 79,488,000 $ (123,209,000) $ 138,000,000  
Tax (Expense) Benefit          
Total other comprehensive income (loss), tax (expense) benefit (28,743,000) (28,053,000) 43,259,000 (48,779,000)  
After-tax          
Transisition obligation 1,934,000 6,059,000 9,742,000 10,123,000  
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale 4,594,000 36,739,000 (77,449,000) 57,301,000  
Net change in unrealized gains (losses) on derivatives used in cash flow hedging relationships, after tax 15,332,000 5,394,000 (54,048,000) 12,068,000  
Change in pension and post-retirement benefit plan assets and liabilities, after-tax 31,109,000 3,243,000 41,805,000 9,729,000  
Total other comprehensive income (loss) 52,969,000 51,435,000 (79,950,000) 89,221,000  
Activity in accumulated other comprehensive income, net of tax          
Beginning Balance     (150,817,000)    
Period change     (79,950,000)    
OCI before reclassifications     (65,302,000)    
Amounts reclassified from accumulated OCI     (14,648,000)    
Ending Balance (230,767,000)   (230,767,000)    
Other Comprehensive Income (Textual) [Abstract]          
Unrealized losses transferred from the available for sale securities portfolio to the held to maturity securities 0   0   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 2,975,000 9,322,000 14,987,000 15,574,000  
Unrealized holding gains (losses) on debt (equity) securities available for sale arising during the period, pretax 4,388,000 61,074,000 (123,647,000) 92,436,000  
Less: Reclassification adjustment for net losses (gains) losses included in net income, pretax 3,023,000 (4,169,000) 4,254,000 (3,906,000)  
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale, pretax 10,386,000 66,227,000 (104,406,000) 104,104,000  
Tax (Expense) Benefit          
Non-credit-related impairment losses (recoveries) on debt (equity) securities not expected to be sold, tax (expense) benefit (1,041,000) (3,263,000) (5,245,000) (5,451,000)  
Unrealized holding gains (losses) on debt (equity) securities available for sale arising during the period, tax (expense) benefit (1,683,000) (21,608,000) 43,413,000 (32,831,000)  
Less: Reclassification adjustment for net losses (gains) losses included in net income, tax (expense) benefit (1,058,000) 1,459,000 (1,489,000) 1,367,000  
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale, tax (expense) benefit (3,782,000) (23,412,000) (36,679,000) 36,915,000  
After-tax          
Transisition obligation 1,934,000 6,059,000 9,742,000 10,123,000  
Unrealized holding gains (losses) on debt (equity) securities available for sale arising during the period, after-tax 2,705,000 39,466,000 (80,234,000) 59,605,000  
Less: Reclassification adjustment for net losses (gains) losses included in net income, after-tax 1,965,000 (2,710,000) 2,765,000 (2,539,000)  
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale 6,604,000 42,815,000 (67,727,000) 67,189,000  
Activity in accumulated other comprehensive income, net of tax          
Beginning Balance     38,304,000    
Period change     (67,727,000)    
OCI before reclassifications     (70,492,000)    
Amounts reclassified from accumulated OCI     2,765,000    
Ending Balance (29,423,000)   (29,423,000)    
Unrealized gains and losses on equity securities [Member]
         
Pretax          
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale, pretax (121,000) (26,000) 32,000 361,000  
Tax (Expense) Benefit          
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale, tax (expense) benefit 45,000 9,000 12,000 126,000  
After-tax          
Net change in unrealized holding gains (losses) on debt (equity) securities available for sale (76,000) (17,000) 20,000 235,000  
Activity in accumulated other comprehensive income, net of tax          
Beginning Balance     194,000    
Period change     20,000    
OCI before reclassifications     20,000    
Amounts reclassified from accumulated OCI     0    
Ending Balance 214,000   214,000    
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 26,672,000 21,595,000 (71,579,000) 5,139,000  
Less: Reclassification adjustment for net losses (gains) losses included in net income, pretax (3,085,000) (13,298,000) (11,571,000) 13,428,000  
Net change in unrealized gains (losses) on derivatives used in cash flow hedging relationships, pretax 23,587,000 8,297,000 (83,150,000) 18,567,000  
Tax (Expense) Benefit          
Unrealized gains and losses on derivatives used in cash flow hedging relationships arising during the period, tax (expense) benefit (9,335,000) (7,568,000) 25,053,000 (1,810,000)  
Less: Reclassification adjustment for net losses (gains) losses included in net income, tax (expense) benefit 1,080,000 4,665,000 4,049,000 (4,689,000)  
Net change in unrealized gains (losses) on derivatives used in cash flow hedging relationships (8,255,000) (2,903,000) 29,102,000 (6,499,000)  
After-tax          
Unrealized gains and losses on derivatives used in cash flow hedging relationships arising during the period, after-tax 17,337,000 14,027,000 (46,526,000) 3,329,000  
Less: Reclassification adjustment for net losses (gains) losses included in net income, after-tax (2,005,000) (8,633,000) (7,522,000) 8,739,000  
Net change in unrealized gains (losses) on derivatives used in cash flow hedging relationships, after tax 15,332,000 5,394,000 (54,048,000) 12,068,000  
Activity in accumulated other comprehensive income, net of tax          
Beginning Balance     47,084,000    
Period change     (54,048,000)    
OCI before reclassifications     (46,526,000)    
Amounts reclassified from accumulated OCI     (7,522,000)    
Ending Balance (6,964,000)   (6,964,000)    
Accumulated Unrealized Losses for Pension and Other Post-retirement obligations [Member]
         
Pretax          
Re-measurement obligation, pre-tax 79,532,000   79,532,000    
Defined benefit pension items, pre-tax (31,672,000)   (15,217,000)    
Curtailment 32,864,000   32,864,000    
Change in pension and post-retirement benefit plan assets and liabilities, pretax 47,860,000   64,315,000    
Tax (Expense) Benefit          
Re-measurement obligation, tax (expense) benefit (27,836,000)   (27,836,000)    
Defined benefit pension items, tax (expense) benefit 11,085,000   5,326,000    
Change in pension and post-retirement benefit plan assets and liabilities, tax (expense) benefit (16,751,000)   (22,510,000)    
After-tax          
Re-measurement obligation, after tax 51,696,000   51,696,000    
Defined benefit pension items, after tax (20,587,000)   (9,891,000)    
Change in pension and post-retirement benefit plan assets and liabilities, after-tax 31,109,000   41,805,000    
Activity in accumulated other comprehensive income, net of tax          
Beginning Balance     (236,399,000)    
Period change     41,805,000    
OCI before reclassifications     51,696,000    
Amounts reclassified from accumulated OCI     (9,891,000)    
Ending Balance $ (194,594,000)   $ (194,594,000)