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Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Basic Net Income per Common Share Available to Common Stockholders [Abstract]
Net income									$ 47,943	$ 36,600	$ 26,684
Net income available to common stockholders	$ 11,976	$ 11,670	$ 10,981	$ 13,316	$ 9,939	$ 8,234	$ 10,037	$ 8,390	$ 47,943	$ 36,600	$ 26,684
Weighted average common shares outstanding									16,675,269	14,487,126	12,531,659
Basic earnings per common share	$ 0.72	$ 0.70	$ 0.66	$ 0.80	$ 0.62	$ 0.54	$ 0.72	$ 0.66	$ 2.88	$ 2.53	$ 2.13
Diluted Net Income per Common Share Available to Common Stockholders [Abstract]
Net income available to common stockholders	$ 11,976	$ 11,670	$ 10,981	$ 13,316	$ 9,939	$ 8,234	$ 10,037	$ 8,390	$ 47,943	$ 36,600	$ 26,684
Weighted average common shares outstanding									16,675,269	14,487,126	12,531,659
Dilutive potential common shares [Abstract]
Assumed conversion of stock options									0	209	4,875
Restricted stock awarded									34,207	13,250	0
Dilutive potential common shares									34,207	13,459	4,875
Diluted weighted average common shares outstanding									16,709,476	14,500,585	12,536,534
Diluted earnings per common share	$ 0.72	$ 0.70	$ 0.66	$ 0.80	$ 0.62	$ 0.54	$ 0.72	$ 0.66	$ 2.87	$ 2.52	$ 2.13

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