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Consolidated Statements of Comprehensive Income (Loss) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Statement of Other Comprehensive Income [Abstract]        
Net income, Before-tax Amount $ 72,906 $ 37,347 $ 119,459 $ 73,262
Net income, Tax (Expense) Benefit (27,371) 2,105 (44,350) 2,182
Net income, Net of Tax Amount 45,535 39,452 75,109 75,444
Net unrealized gains/losses on cash flow hedges: Before-tax Amount        
Reclassification adjustment for losses (gains) realized in net income, Before-tax Amount 112 (405) 224 (1,218)
Net unrealized gains (losses) arising during the period, Before-tax Amount 0 (15) 0 (337)
Valuation allowance for the change in deferred taxes arising from unrealized gains/losses, Before-tax Amount 0 [1] 0 [1] 0 [1] 0 [1]
Net unrealized gains (losses), Before-tax Amount 112 (420) 224 (1,555)
Net unrealized gains/losses on cash flow hedges: Tax (Expense) Benefit        
Reclassification adjustment for losses (gains) realized in net income, Tax (Expense) Benefit (45) 156 (88) 474
Net unrealized gains (losses) arising during the period, Tax (Expense) Benefit 0 15 0 134
Valuation allowance for the change in deferred taxes arising from unrealized gains/losses, Tax (Expense) Benefit 0 [1] (171) [1] 0 [1] (608) [1]
Net unrealized gains (losses), Tax (Expense) Benefit (45) 0 (88) 0
Net unrealized gains/losses on cash flow hedges: Net of Tax Amount        
Reclassification adjustment for losses (gains) realized in net income, Net of Tax Amount 67 (249) 136 (744)
Net unrealized gains (losses) arising during the period, Net of Tax Amount 0 0 0 (203)
Valuation allowance for the change in deferred taxes arising from unrealized gains/losses, Net of Tax Amount 0 [1] (171) [1] 0 [1] (608) [1]
Net unrealized gains (losses), Net of Tax Amount 67 (420) 136 (1,555)
Net unrealized gains/losses on investment securities available for sale: Before-tax Amount        
Reclassification adjustment for (gains) losses realized in net income, Tax (Expense) Benefit (1,403) (4,170) (1,448) (24,253)
Net unrealized gains (losses) arising during the period, Before-tax Amount (57,850) 13,146 (60,014) 11,076
Valuation allowance for the change in deferred taxes arising from unrealized gains/losses, Before-tax Amount 0 [1] 0 [1] 0 [1] 0 [1]
Net unrealized gains (losses), Before-tax Amount (59,253) 8,976 (61,462) (13,177)
Net unrealized gains/losses on investment securities available for sale: Tax (Expense) Benefit        
Other Comprehensive Income (Loss), Reclassification Adjustment for Sale of Securities Included in Net Income, Tax 541 1,605 557 9,338
Net unrealized gains (losses) arising during the period, Tax (Expense) Benefit 22,272 (5,062) 23,105 (4,263)
Valuation allowance for the change in deferred taxes arising from unrealized gains/losses, Tax (Expense) Benefit 0 [1] 3,457 [1] 0 [1] (5,075) [1]
Net unrealized gains (losses), Tax (Expense) Benefit 22,813 0 23,662 0
Net unrealized gains/losses on investment securities available for sale: Net of Tax Amount        
Reclassification adjustment for (gains) losses realized in net income, Net of Tax Amount (862) (2,565) (891) (14,915)
Net unrealized gains (losses) arising during the period, Net of Tax Amount (35,578) 8,084 (36,909) 6,813
Valuation allowance for the change in deferred taxes arising from unrealized gains/losses, Net of Tax Amount 0 [1] 3,457 [1] 0 [1] (5,075) [1]
Net unrealized gains (losses), Net of Tax Amount (36,440) 8,976 (37,800) (13,177)
Post-retirement unfunded health benefit: Before-tax Amount        
Reclassification adjustment for (gains) losses realized in net income, Before-tax Amount 0 (36) (26) (36)
Amortization arising during the period, Before-tax Amount 844 678 830 678
Valuation allowance for the change in deferred taxes arising from amortization, Before-tax Amount 0 0 0 0
Net amortization, Before-tax Amount (844) (642) (804) (642)
Post-retirement unfunded health benefit: Tax (Expense) Benefit        
Reclassification adjustment for (gains) losses realized in net income, Tax (Expense) Benefit 7 14 10 14
Amortization arising during the period, Tax (Expense) Benefit (325) (261) (311) (261)
Valuation allowance for the change in deferred taxes arising from amortization, Tax (Expense) Benefit 0 247 0 247
Net amortization, Tax (Expense) Benefit 318 0 301 0
Post-retirement unfunded health benefit: Net of Tax Amount        
Reclassification adjustment for (gains) losses realized in net income, Net of Tax Amount 7 (22) (16) (22)
Amortization arising during the period, Net of Tax Amount 519 417 519 417
Valuation allowance for the change in deferred taxes arising from amortization, Net of Tax Amount 0 247 0 247
Net amortization, Net of Tax Amount (526) (642) (503) (642)
Other comprehensive (loss) income, Before-tax Amount (58,297) 9,198 (60,434) (14,090)
Other comprehensive (loss) income, Tax (Expense) Benefit 22,450 0 23,273 0
Other comprehensive (loss) income, Net of Tax Amount (35,847) 9,198 (37,161) (14,090)
Comprehensive income, Net of Tax Amount $ 9,688 $ 48,650 $ 37,948 $ 61,354
[1] In accordance with ASC 740-20-45-11(b), a deferred tax asset valuation allowance associated with unrealized gains and losses not recognized in income is charged directly to other comprehensive income (loss).