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Consolidation Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Net income $ 32,653 $ 18,274 $ 81,083 $ 36,655
Unrealized holding gains (losses) during period 6,383 23,803 (50,576) 41,777
Non-credit portion of other-than-temporary impairments recognized in other comprehensive income 0 1,315 50 1,457
HTM Securities (307) (219) (1,172) (1,236)
Realized (gains) losses on available for sale securities (8,785) 674 (16,107) (2,243)
Total unrealized (losses) gains on Investment Securities (2,708) 25,579 (67,796) 39,932
Amount reclassified into Net Income: Net actuarial loss 513 904 2,222 2,712
Amount reclassified into Net Income: Prior service cost 0 24 6 73
Amount reclassified into Net Income: Curtailment expense 0 0 11 0
Total defined benefit pension and post-retirement plans 513 928 30,839 2,785
Comprehensive income 30,458 44,781 44,126 79,372
Accumulated Defined Benefit Plans Adjustment [Member]
        
Net actuarial gain 0 0 28,600 0
Total defined benefit pension and post-retirement plans     2,239  
Accumulated Other-than-Temporary Impairment [Member]
        
Amounts reclassified into Net Income: Non-credit other-than-temporary impairment 1 6 9 177
Other comprehensive (loss) income     59  
Accumulated other comprehensive income [Member]
        
Amounts reclassified into Net Income: Non-credit other-than-temporary impairment     (15,031)  
Other comprehensive (loss) income $ (2,195) $ 26,507 $ (36,957) $ 42,717