CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Treasury Stock [Member]	Parent [Member]	Noncontrolling Interest [Member]
Balance at Dec. 31, 2017	$ 468,667	$ 108,862	$ 363,794	$ (670)	$ (3,408)	$ 468,578	$ 89
Balance (in shares) at Dec. 31, 2017		25,025,933
Adoption of ASU | Accounting Standards Update 2018-02 [Member]	0		173	(173)		0
Adoption of ASU | Accounting Standards Update 2014-09 [Member]	24		24			24
Adoption of ASU | Accounting Standards Update 2016-01 [Member]	0		68	(68)		0
Net income	18,336		18,336			18,336
Other comprehensive income (loss), net of tax	(7,077)			(7,077)		(7,077)
Cash dividends declared	(5,545)		(5,545)			(5,545)
Treasury shares purchased under deferred directors' plan	0	$ 185			(185)	0
Treasury shares purchased under deferred directors' plan (in shares)		(3,807)
Treasury shares sold and distributed under deferred directors' plan	0	$ (115)			115	0
Treasury shares sold and distributed under deferred directors' plan (in shares)		5,636
Stock activity under equity incentive plans	(2,483)	$ (2,483)				(2,483)
Stock activity under equity incentive plans (in shares)		96,679
Stock based compensation expense	1,411	$ 1,411				1,411
Balance at Mar. 31, 2018	473,333	$ 107,860	376,850	(7,988)	(3,478)	473,244	89
Balance (in shares) at Mar. 31, 2018		25,124,441
Balance at Dec. 31, 2018	521,615	$ 112,383	419,179	(6,191)	(3,756)	521,615	89
Balance (in shares) at Dec. 31, 2018		25,128,773
Adoption of ASU	(1,327)		(1,327)			(1,327)
Net income	21,682		21,682			21,682
Other comprehensive income (loss), net of tax	8,678			8,678		8,678
Cashless exercise of warrants (in shares)		224,066
Cashless exercise of warrants	0	$ 0				0
Cash dividends declared	(6,581)		(6,581)			(6,581)
Treasury shares purchased under deferred directors' plan	0	$ 195			(195)	0
Treasury shares purchased under deferred directors' plan (in shares)		(4,578)
Treasury shares sold and distributed under deferred directors' plan	0	$ (118)			118	0
Treasury shares sold and distributed under deferred directors' plan (in shares)		5,699
Stock activity under equity incentive plans	(2,089)	$ (2,089)				(2,089)
Stock activity under equity incentive plans (in shares)		88,867
Stock based compensation expense	1,200	$ 1,200				1,200
Balance at Mar. 31, 2019	$ 543,178	$ 111,571	$ 432,953	$ 2,487	$ (3,833)	$ 543,178	$ 89
Balance (in shares) at Mar. 31, 2019		25,442,827