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Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Statement of Income and Comprehensive Income [Abstract]        
Net income $ 4,078 $ 5,728 $ 10,079 $ 11,479
Available-for-sale securities:        
Unrealized gains on securities available-for-sale with other-than-temporary impairment (314) (964) (105) (21)
Unrealized gain on securities available-for-sale without other-than-temporary impairment 5,326 6,387 5,821 12,479
Less: reclassification adjustment for gains realized in net income 9 (3,224) (42) (5,060)
Less: reclassification adjustment for credit related other-than-temporary impairments recognized in net income         527
Unrealized gains on available-for-sale securities in OCI 5,021 2,199 5,674 7,925
Defined benefit plans:        
Less: reclassification adjustment for amortization in net prior service cost 106   150  
Unrealized gains on benefit plans 106   150  
Derivative securities:        
Unrealized gains on derivative securities         30
Other comprehensive income (loss), before tax 5,127 2,199 5,823 7,955
Income tax expense related to items of other comprehensive income (1,938) (819) (2,201) (2,963)
Other comprehensive income, net of tax 3,189 1,380 3,622 4,992
Total comprehensive income $ 7,267 $ 7,108 $ 13,701 $ 16,471