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Condensed Consolidated Statements of Comprehensive Income (Unaudited) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2014 | Mar. 31, 2013
Statement Of Income And Comprehensive Income [Abstract] |  |
Net income | $ 3,417 | $ 5,311
Change in fair value of derivative instruments: |  |
Change in fair value of derivative instruments for the period | (225) | 439
Income tax effect | 79 | (154)
Changes from derivative instruments | (146) | 285
Change in securities available-for-sale: |  |
Unrealized appreciation (depreciation) for the period | 4,426 | (1,704)
Reclassification adjustment for securities gains realized in income |  | (368)
Income tax effect | (1,550) | 726
Unrealized gains (losses) on available-for-sale securities | 2,876 | (1,346)
Other Comprehensive Income (Loss), Net of Tax | 2,730 | (1,061)
Comprehensive Income | $ 6,147 | $ 4,250

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