Condensed Consolidated Statement of Stockholders' Equity - USD ($) $ in Thousands	Total	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income
Beginning Balances at Dec. 31, 2018	$ 491,992	$ 276,101	$ 224,035	$ (8,144)
Net income	27,458		27,458
Other comprehensive income (loss), net of tax	12,351			12,351
Amortization of unearned compensation	301	301
Exercise of stock options	155	155
Stock option expense	115	115
Stock issued stock plans	514	1,341
Stock issued in Salin acquisition	0	102,722
Cash dividends on common stock	(9,974)		(9,974)
Ending Balances at Jun. 30, 2019	$ 626,461	380,735	241,519	4,207
Cash dividends on common stock, per share	$ 0.22
Beginning Balances at Mar. 31, 2019	$ 609,468	378,963	230,327	178
Net income	16,642		16,642
Other comprehensive income (loss), net of tax	4,029			4,029
Amortization of unearned compensation	210	210
Exercise of stock options	38	38
Stock option expense	58	58
Stock issued stock plans	1,466	1,466
Cash dividends on common stock	(5,450)		(5,450)
Ending Balances at Jun. 30, 2019	$ 626,461	380,735	241,519	4,207
Cash dividends on common stock, per share	$ 0.12
Impact of adoption of ASU No. 2016-13	$ (15,635)		(15,635)
Beginning Balances at Dec. 31, 2019	656,023	379,853	269,738	6,432
Net income	26,294		26,294
Other comprehensive income (loss), net of tax	14,838			14,838
Amortization of unearned compensation	122	122
Exercise of stock options	157	157
Stock option expense	77	77
Stock issued stock plans	514	514
Repurchase of outstanding stock	(19,636)	(19,636)
Cash dividends on common stock	(10,548)		(10,548)
Ending Balances at Jun. 30, 2020	$ 652,206	361,087	269,849	21,270
Cash dividends on common stock, per share	$ 0.24
Beginning Balances at Mar. 31, 2020	$ 630,842	361,019	260,501	9,322
Net income	14,639		14,639
Other comprehensive income (loss), net of tax	11,948			11,948
Amortization of unearned compensation	(79)	(79)
Exercise of stock options	(98)	(98)
Stock option expense	27	27
Stock issued stock plans	218	218
Cash dividends on common stock	(5,291)		(5,291)
Ending Balances at Jun. 30, 2020	$ 652,206	$ 361,087	$ 269,849	$ 21,270
Cash dividends on common stock, per share	$ 0.12