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Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]        
Securities gains $ 458 $ 12 $ 522 $ 142
Tax expense 5,223 3,724 14,106 13,084
Net income 12,312 11,222 35,480 34,562
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 458 12 522 142
Tax expense 160 4 183 50
Net income $ 298 $ 8 $ 339 $ 92