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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 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]        
Net income, Gross $ (692) $ (99) $ 22,499 $ 26,059
Unrealized holding gains during the period, Gross 7,849 30,099 27,653 29,166
Non Credit Portion Of Other Than Temporary Impairment Losses Recognized In Other Comprehensive Income Gross 114 418 481 598
Amortization of net unrealized gains on HTM securities, Gross (682) (1,258) (1,476) (2,433)
Reclassification adjustment for gains included in net income, Gross (218) (2,144) (4,577) (7,893)
Net unrealized gains, Gross 7,063 27,115 22,081 19,438
Reversal of amortization of net actuarial loss, Gross 1,391 1,104 2,781 2,209
Reversal of amortization of prior service cost, Gross 37 38 75 75
Defined benefit plans, Gross 1,428 1,142 2,856 2,284
Comprehensive income, Gross 7,799 28,158 47,436 47,781
Net income, Tax (980) (1,566) 4,118 4,092
Unrealized holding gains during the period, Tax 2,748 10,536 9,679 10,209
Portion of OTTI recognized in OCI, Tax 39 146 168 209
Amortization of net unrealized gains on HTM securities, Tax (239) (441) (517) (852)
Reclassification adjustment for gains included in net income, Tax (76) (751) (1,602) (2,763)
Net unrealized gains, Tax 2,472 9,490 7,728 6,803
Reversal of amortization of net actuarial loss, Tax 486 386 973 773
Reversal of amortization of prior service cost, Tax 13 13 26 26
Defined benefit pension and post-retirement plans, Tax 499 399 999 799
Comprehensive income, Tax 1,991 8,323 12,845 11,694
Net income 288 1,467 18,381 21,967
Unrealized holding gains during the period, Net 5,101 19,563 17,974 18,957
Non-credit portion of other-than-temporary impairments recognized in other comprehensive income 75 272 313 389
Amortization of net unrealized gains on held-to-maturity securiites (443) (817) (959) (1,581)
Less: reclassification adjustment for gains included in net income (142) (1,393) (2,975) (5,130)
Total unrealized gains on investment securities 4,591 17,625 14,353 12,635
Amortization of net actuarial loss included in net income 905 718 1,808 1,436
Reversal of amortization of prior service cost, Net 24 25 49 49
Total defined benefit pension plans 929 743 1,857 1,485
Comprehensive income $ 5,808 $ 19,835 $ 34,591 $ 36,087