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Consolidation Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Net income $ 17,974 $ 21,308
Unrealized holding gains arising during period 21,426 2,394
Non-credit portion of other-than-temporary impairments recognized in other comprehensive income 0 20
Amount reclassified into net income: Held-to-maturity Securities (296) (466)
Realized gains on available for sale securities (4,699) (3,884)
Total unrealized gains (losses) on investment securities 16,431 (1,932)
Amount reclassified into Net Income: Net actuarial loss 247 1,196
Amount reclassified into Net Income: Prior service cost 0 6
Amount reclassified into Net Income: Curtailment expense 0 11
Total defined benefit pension and post-retirement plans 247 29,813
Comprehensive income 34,652 49,189
Accumulated Defined Benefit Plans Adjustment [Member]
    
Net actuarial gain 0 28,600
Total defined benefit pension and post-retirement plans 247  
Accumulated Other-than-Temporary Impairment [Member]
    
Amounts reclassified into Net Income: Non-credit other-than-temporary impairment 0 4
Other comprehensive income 0  
Accumulated other comprehensive income [Member]
    
Amounts reclassified into Net Income: Non-credit other-than-temporary impairment (4,748)  
Other comprehensive income $ 16,678 $ 27,881