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Accumulated Other Comprehensive Income (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Mar. 31, 2018
Jun. 30, 2019
Jun. 30, 2018
Amounts Reclassified from AOCI [Abstract]            
Securities gains $ 204   $ 2   $ 560 $ (286)
Tax expense (1,638)   2,921   2,303 5,381
Net income 18,324 $ 14,939 11,599 $ 15,814 33,263 27,413
Unrealized Gains on AFS Securities [Member] | Reclassification Out of Accumulated Other Comprehensive Income [Member]            
Amounts Reclassified from AOCI [Abstract]            
Securities gains 5   2   6 151
Tax expense 1   0   2 32
Net income $ 4   $ 2   $ 4 $ 119