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Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Securities gains $ 68 $ 144
Tax expense 4,686 4,984
Net income 11,602 10,938
Unrealized Gains (Losses) on AFS Securities [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]    
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]    
Securities gains 68 144
Tax expense 24 50
Net income $ 44 $ 94