CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Common Stock	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock	Total Stockholders' Equity	Noncontrolling Interest	Total
Balance at Dec. 31, 2018	$ 112,383	$ 419,179	$ (6,191)	$ (3,756)	$ 521,615	$ 89	$ 521,704
Balance (in shares) at Dec. 31, 2018	25,128,773
Increase (Decrease) in Stockholders' Equity
Adoption of ASU | Accounting Standards Update 2017-08		(1,327)			(1,327)		(1,327)
Net income		21,682			21,682		21,682
Other comprehensive income, net of tax			8,678		8,678		8,678
Cash dividends declared		(6,581)			(6,581)		(6,581)
Cashless exercise of warrants	$ 0				0		0
Cashless exercise of warrants (in shares)	224,066
Treasury shares purchased under deferred directors' plan	$ 195			(195)	0		0
Treasury shares purchased under deferred directors' plan (in shares)	(4,578)
Treasury shares sold and distributed under deferred directors' plan	$ (118)			118	0		0
Treasury shares sold and distributed under deferred directors' plan (in shares)	5,699
Stock activity under equity compensation plans	$ 2,089				2,089		2,089
Stock activity under equity compensation plans (in shares)	88,867
Stock based compensation expense	$ 1,200				1,200		1,200
Balance at Mar. 31, 2019	$ 111,571	432,953	2,487	(3,833)	543,178	89	543,267
Balance (in shares) at Mar. 31, 2019	25,442,827
Balance at Dec. 31, 2019	$ 114,858	475,247	12,059	(4,153)	598,011	89	$ 598,100
Balance (in shares) at Dec. 31, 2019	25,444,275						25,444,275
Increase (Decrease) in Stockholders' Equity
Net income		17,299			17,299		$ 17,299
Other comprehensive income, net of tax			10,491		10,491		10,491
Cash dividends declared		(7,689)			(7,689)		(7,689)
Treasury shares purchased under share repurchase plan				(10,012)	(10,012)		(10,012)
Treasury shares purchased under share repurchase plan (in shares)	(289,101)
Treasury shares purchased under deferred directors' plan	$ 215			(215)	0		0
Treasury shares purchased under deferred directors' plan (in shares)	4,449
Treasury shares sold and distributed under deferred directors' plan	$ (119)			119	0		0
Treasury shares sold and distributed under deferred directors' plan (in shares)	5,748
Stock activity under equity compensation plans	$ (2,030)				(2,030)		(2,030)
Stock activity under equity compensation plans (in shares)	78,099
Stock based compensation expense	$ 413				413		413
Balance at Mar. 31, 2020	$ 113,337	$ 484,857	$ 22,550	$ (14,261)	$ 606,483	$ 89	$ 606,572
Balance (in shares) at Mar. 31, 2020	25,234,572						25,234,572