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Consolidation Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Net income $ 1,308 $ 18,274 $ 288 $ 18,093 $ 18,034 $ (17,968) $ 1,467 $ 20,500 $ 37,963 $ 22,033 $ 66,966
Unrealized holding gains arising during period                 30,937 45,592 29,018
Non-credit portion of other-than-temporary impairment losses recognized in other comprehensive income                 1,842 1,093 3,416
Amortization of net unrealized gains on held-to-maturity securiites                 (847) (2,013) (7,610)
Less: reclassification adjustment for gains included in net income                 (6,852) (1,292) (295)
Total unrealized gains on investment securities                 25,080 43,380 24,529
Net actuarial loss                 (17,268) (10,919) (7,829)
Amortization of net actuarial loss included in net income                 3,837 2,712 2,687
Amortization of prior service cost included in net income                 97 97 97
Total defined benefit pension plans                 (13,334) (8,110) (5,045)
Other comprehensive income (30,971) 26,507 5,520 10,690 10,130 11,020 18,368 (4,248) 11,746 35,270 19,484
Comprehensive income $ (29,663) $ 44,781 $ 5,808 $ 28,783 $ 28,164 $ (6,948) $ 19,835 $ 16,252 $ 49,709 $ 57,303 $ 86,450