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Consolidated Statement of Comprehensive Income (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013
Statement of Comprehensive Income [Abstract] |  |
Net income | $ 22,366 | $ 55,585
Unrealized gains on securities: |  |
Change in unrealized securities gains arising during period | 11,899 | (1,476)
Tax effect | (4,643) | 565
Total change in unrealized gains on securities, net of tax | 7,256 | (911)
Change in fair value of cash flow hedges: |  |
Change in unrecognized loss on cash flow hedges | 719 | 815
Tax effect | (278) | (322)
Total change in unrecognized loss on cash flow hedges, net of tax | 441 | 493
Change in pension obligation: |  |
Reclassification adjustment for losses included in income before income taxes | 1,599 | 4,304
Tax effect | (622) | (1,685)
Total change in pension obligation, net of tax | 977 | 2,619
Net current period other comprehensive income | 8,674 | 2,201
Total comprehensive income | $ 31,040 | $ 57,786

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