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Other Comprehensive Income (Details) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Components of other comprehensive income and related tax effects      
Unrealized holding gains on available for sale securities $ 6,597 $ 22,457 $ 3,815
Less reclassification adjustment for gains recognized in earnings (1,379) (614) (1,660)
Net unrealized gains 5,218 21,843 2,155
Tax effect (1,826) (7,642) (755)
Net-of-tax amount 3,392 14,201 1,400
Unrealized holding gains (losses) on available for sale securities for which a portion of an other-than-temporary impairment has been recognized in earnings 260 (28) (466)
Less reclassification adjustment for impairment loss recognized in earnings    398 2,241
Net unrealized gains 260 370 1,775
Tax effect (91) (130) (621)
Net-of-tax amount 169 240 1,154
Actuarial loss on postemployment health care plan (578) (757) (380)
Net amortization of transition obligation and actuarial gain 41 11 3
Net unrealized loss on postemployment health care plan (537) (746) (377)
Tax effect 188 261 132
Net-of-tax amount (349) (485) (245)
Unrealized loss on interest rate swap (465) (1,205) (566)
Less reclassification adjustment for losses recognized in earnings 390 402 401
Net unrealized gain (loss) (75) (803) (165)
Tax effect (26) (281) (58)
Net-of-tax amount (49) (522) (107)
Other comprehensive income $ 3,163 $ 13,434 $ 2,202