Condensed Consolidated Statement of Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income
Beginning balances at Dec. 31, 2020	$ 692,216	$ 0	$ 0	$ 362,945	$ 301,419	$ 27,852
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	42,595				42,595
Other comprehensive loss, net of tax	(9,214)					(9,214)
Amortization of unearned compensation	784			784
Exercise of stock options	769			769
Stock option expense	42			42
Net settlement of share awards	(1,347)			(1,347)
Stock retirement plans	(3,966)			(3,966)
Cash dividends on common stock	(11,505)				(11,505)
Ending balances at Jun. 30, 2021	710,374	0	0	359,227	332,509	18,638
Beginning balances at Mar. 31, 2021	689,379	0	0	362,613	316,080	10,686
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	22,173				22,173
Other comprehensive loss, net of tax	7,952					7,952
Amortization of unearned compensation	449			449
Exercise of stock options	116			116
Stock option expense	15			15
Stock retirement plans	(3,966)			(3,966)
Cash dividends on common stock	(5,744)				(5,744)
Ending balances at Jun. 30, 2021	710,374	0	0	359,227	332,509	18,638
Beginning balances at Dec. 31, 2021	723,209	0	0	352,122	363,742	7,345
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	48,422				48,422
Other comprehensive loss, net of tax	(100,409)					(100,409)
Amortization of unearned compensation	1,143			1,143
Exercise of stock options	94			94
Stock option expense	13			13
Net settlement of share awards	(1,696)			(1,696)
Stock retirement plans	736			736
Cash dividends on common stock	(13,647)				(13,647)
Ending balances at Jun. 30, 2022	657,865	0	0	352,412	398,517	(93,064)
Beginning balances at Mar. 31, 2022	677,450	0	0	351,522	380,700	(54,772)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	24,859				24,859
Other comprehensive loss, net of tax	(38,292)					(38,292)
Amortization of unearned compensation	627			627
Net settlement of share awards	(25)			(25)
Stock retirement plans	288			288
Cash dividends on common stock	(7,042)				(7,042)
Ending balances at Jun. 30, 2022	$ 657,865	$ 0	$ 0	$ 352,412	$ 398,517	$ (93,064)