Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]
Balance, shares at Dec. 31, 2019	22,206,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation (shares)	48,000
Balance, shares at Mar. 31, 2020	22,254,000
Balance at Dec. 31, 2019	$ 405,880	$ 222	$ 229,229	$ 162,911	$ 13,518
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock under stock-based compensation plan	702	1	701
Adoption of new accounting standard for credit losses, net | Accounting Standards Update 2016-13 [Member]	78			78
Stock-based compensation	812		812
Dividends declared	(2,001)			(2,001)
Other comprehensive loss	(9,223)				(9,223)
Net income	5,086			5,086
Balance at Mar. 31, 2020	$ 401,334	223	230,742	166,074	4,295
Balance, shares at Dec. 31, 2020	22,757,251
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Stock-based compensation (shares)	55,000
Balance, shares at Mar. 31, 2021	22,811,929
Balance at Dec. 31, 2020	$ 576,238	228	291,315	243,315	41,380
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of stock under stock-based compensation plan	339	0	339
Stock-based compensation	1,036		1,036
Dividends declared	(2,504)			(2,504)
Other comprehensive loss	(19,622)				(19,622)
Net income	32,079			32,079
Balance at Mar. 31, 2021	$ 587,566	$ 228	$ 292,690	$ 272,890	$ 21,758