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Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Before-Tax Amount |  |  |
Unrealized losses on available-for-sale securities | $ (4,702) | $ 25,063 | $ (11,218)
Reclassification adjustment for gains realized in net income |  | (28,829) | (11,864)
Unrealized net holding gain on cash flow hedge | 846 | 788 | (151)
Changes in pension plan assets and benefit obligations recognized in other comprehensive income | (9,508) | (7,734) | (3,734)
Other comprehensive loss | (13,364) | (10,712) | (26,967)
Tax Effect |  |  |
Unrealized losses on available-for-sale securities | (1,645) | 8,772 | (3,926)
Reclassification adjustment for gains realized in net income |  | (10,090) | (4,152)
Unrealized net holding gain on cash flow hedge | 296 | 276 | (53)
Changes in pension plan assets and benefit obligations recognized in other comprehensive income | (3,328) | (2,707) | (1,307)
Other comprehensive loss | (4,677) | (3,749) | (9,438)
Net-of-Tax Amount |  |  |
Unrealized losses on available-for-sale securities | (3,057) | 16,291 | (7,292)
Reclassification adjustment for gains realized in net income |  | (18,739) | (7,712)
Unrealized net holding gain on cash flow hedge | 550 | 512 | (98)
Changes in pension plan assets and benefit obligations recognized in other comprehensive income | (6,180) | (5,027) | (2,427)
Other comprehensive loss | $ (8,687) | $ (6,963) | $ (17,529)

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