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Comprehensive Income (Components of Comprehensive Income-Gross and Net of Tax) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Net income, Gross $ 25,084 $ 27,333
Unrealized holding gains during the period, Gross 32,964 3,684
Non-credit portion of other-than-temporary impairment losses recognized in other comprehensive income, Gross   30
HTM securties, Gross (456) (717)
Realized gains on AFS securities, Gross (7,229) (5,976)
Net unrealized gains (losses), Gross 25,279 (2,972)
Amount reclassified into Net Income: Net actuarial loss, Gross 380 1,840
Amount reclassified into Net Income: Prior service cost, Gross 0 10
Amount reclassified into Net Income: Curtailment expense, Gross   16
Defined pension and other post-retirement benefit plans, gross 380 45,866
Comprehensive income, Gross 50,743 70,227
Net income, Tax 7,110 6,025
Unrealized holding gains (losses) during the period, Tax 11,538 1,290
Non-credit portion of other-than-temporary impairment losses recognized in other comprehensive income, Tax   10
HTM securities, Tax (160) (251)
Realized gains on AFS securities, Tax (2,530) (2,092)
Net unrealized gains (losses), Tax 8,848 (1,040)
Amount reclassified into Net Income: Net actuarial loss, Tax 133 644
Amount reclassified into Net Income: Prior service cost, Tax 0 4
Amount reclassified into Net Income: Curtailment expense, tax   5
Defined pension and other post-retirement benefit plans, tax 133 16,053
Comprehensive income, Tax 16,091 21,038
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
HTM Securities (296) (466)
Realized gains on available for sale securities (4,699) (3,884)
Net 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 Other-than-Temporary Impairment [Member]
    
Non-credit OTTI, Gross   7
Non-credit OTTI, Tax   3
Amounts reclassified from AOCI 0 4
Other Comprehensive Income, Net of Tax 0  
Accumulated other comprehensive income [Member]
    
Other comprehensive loss, Gross 25,659 42,894
Other comprehensive income, Tax 8,981 15,013
Amounts reclassified from AOCI (4,748)  
Other Comprehensive Income, Net of Tax 16,678 27,881
Accumulated Defined Benefit Plans Adjustment [Member]
    
Net actuarial gain, Gross   44,000
Net actuarial gain, Tax   15,400
Net actuarial gain 0 28,600
Total defined benefit pension and post-retirement plans $ 247