Income Taxes - Reconciliation Between The Amount Of Reported Total Income Tax Expense And The Amount Computed By Multiplying The Applicable Statutory Income Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Income Tax Disclosure [Abstract]
Tax expense at statutory rate	$ 10,439	$ 18,111	$ 13,928
Increase (decrease) in taxes resulting from:
State tax, net of federal income tax	1,448	1,674	460
Impact of 2017 federal tax reform	0	10,453	0
Bank owned life insurance	(778)	(1,885)	(1,399)
ESOP fair market value adjustment	196	404	352
Incentive stock options	146	247	299
Uncertain tax position	0	132	178
Merger related costs	0	0	74
Excess tax benefits from employee share based payments	(1,939)	(2,309)	0
Other, net	120	151	(227)
Income tax expense	$ 9,632	$ 26,978	$ 13,665