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Consolidation Statements of Comprehensive Income (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Dec. 31, 2013
Sep. 30, 2013
Jun. 30, 2013
Mar. 31, 2013
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Net income $ 25,335 $ 32,653 $ 27,122 $ 21,308 $ 1,308 $ 18,274 $ 288 $ 18,093 $ 106,418 $ 37,963 $ 22,033
Unrealized holding (losses) gains arising during period                 (54,557) 30,937 45,592
Non-credit portion of other-than-temporary impairments recognized in other comprehensive income                 50 1,660 772
Amount reclassified into net income: Held-to-maturity securities                 (1,025) (1,581) (1,484)
Realized gains on available for sale securities                 (15,301) (6,118) (1,821)
Total unrealized (losses) gains on investment securities                 (70,824) 25,080 43,380
Amount reclassified into net income: Net actuarial loss                 2,843 3,837 2,712
Amount reclassified into net income: Prior service cost                 6 97 97
Amount reclassified into net income: Curtailment expense                 11 0 0
Total defined benefit pension and post-retirement plans                 41,635 (13,334) (8,110)
Other comprehensive (loss) income 7,768 (2,195) (62,643) 27,881 (30,971) 26,507 5,520 10,690      
Comprehensive income 33,103 30,458 (35,521) 49,189 (29,663) 44,781 5,808 28,783 77,229 49,709 57,303
Accumulated Other-than-Temporary Impairment [Member]
                      
Amounts reclassified into net income: Non-credit other-than-temporary impairment                 9 182 321
Other comprehensive (loss) income                 59 1,842  
Accumulated Defined Benefit Plans Adjustment [Member]
                      
Net actuarial gain (loss)                 38,775 (17,268) (10,919)
Total defined benefit pension and post-retirement plans                 2,860 3,934  
Accumulated other comprehensive income (loss) [Member]
                      
Amounts reclassified into net income: Non-credit other-than-temporary impairment                 (13,457) (3,583)  
Other comprehensive (loss) income                 $ (29,189) $ 11,746 $ 35,270