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Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]        
Tax expense (benefit) $ 4,376 $ 5,619 $ 9,360 $ 10,088
Net income 12,402 12,195 23,340 22,335
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 (losses) (14) (51) 130 (111)
Tax expense (benefit) (5) (18) 45 (39)
Net income $ (9) $ (33) $ 85 $ (72)