Shareholders' Equity - Earnings Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Equity [Abstract]
Net income	$ 20,347	$ 21,443	$ 21,289
Income available to common shareholders	$ 20,347	$ 21,443	$ 21,289
Weighted average shares outstanding	12,534,078	13,415,118	13,699,823
Net income per common share (in dollars per share)	$ 1.62	$ 1.60	$ 1.55
Effect of dilutive stock options and warrants	42,241	98,489	125,185
Weighted average shares of common stock and common stock equivalents	12,576,319	13,513,607	13,825,008
Net income per diluted common share (in dollars per share)	$ 1.62	$ 1.59	$ 1.54
Antidilutive options and warrants excluded from computation of earnings per share	0	0	0