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Income Taxes (Schedule of Effective Tax Rate Reconciliation) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Income Taxes [Abstract]      
Tax provision at statutory rate $ 14,405 $ 13,486 $ 11,473
Increase (decrease) in income taxes resulting from:      
Tax-exempt interest income (930) (832) (818)
Low income housing tax credits (191) (179) (150)
Non-deductible interest expense 11 11 15
State income taxes, net of federal benefit 1,152 1,375 1,366
Change in valuation allowance (58) 16 (3)
Other, net (263) (342) 198
Income tax expense $ 14,126 $ 13,535 $ 12,081