Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Retained Earnings		Treasury Stock	Accumulated Other Comprehensive Income
Balance at beginning of period at Dec. 31, 2019	$ 725,263	$ 560,263	$ 162,752	[1]	$ 0	$ 2,248
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	24,243		24,243	[1]
Other comprehensive income, net of tax	9,169					9,169
Purchase of treasury stock, 131,035 shares	(1,452)				(1,452)
Issuance of stock	1,461	1,461
Retirement of restricted stock	(467)	(467)
Cash dividends on common stock	(12,728)		(12,728)	[1]
Balance at end of period at Jun. 30, 2020	745,489	561,257	174,267	[1],[2]	(1,452)	11,417
Balance at beginning of period at Mar. 31, 2020	736,922	560,653	168,780	[2]	(1,452)	8,941
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	11,851		11,851	[2]
Other comprehensive income, net of tax	2,476					2,476
Issuance of stock	614	614
Retirement of restricted stock	(10)	(10)
Cash dividends on common stock	(6,364)		(6,364)	[2]
Balance at end of period at Jun. 30, 2020	745,489	561,257	174,267	[1],[2]	(1,452)	11,417
Balance at beginning of period at Dec. 31, 2020	763,784	562,421	191,418	[1]	(1,452)	11,397
Balance at end of period at Mar. 31, 2021	768,065	562,984	208,224	[2]	(1,452)	(1,691)
Balance at beginning of period at Dec. 31, 2020	763,784	562,421	191,418	[1]	(1,452)	11,397
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	50,582		50,582	[1]
Other comprehensive income, net of tax	(6,052)					(6,052)
Issuance of stock	2,196	2,196
Retirement of restricted stock	(656)	(656)
Exercise of stock options	19	19
Cash dividends on common stock	(13,197)		(13,197)	[1]
Balance at end of period at Jun. 30, 2021	796,676	563,980	228,803	[1],[2]	(1,452)	5,345
Balance at beginning of period at Mar. 31, 2021	768,065	562,984	208,224	[2]	(1,452)	(1,691)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	27,407		27,407	[2]
Other comprehensive income, net of tax	7,036					7,036
Issuance of stock	990	990
Exercise of stock options	6	6
Cash dividends on common stock	(6,828)		(6,828)	[2]
Balance at end of period at Jun. 30, 2021	$ 796,676	$ 563,980	$ 228,803	[1],[2]	$ (1,452)	$ 5,345

[1] The Company adopted ASU 2016-13 at December 31, 2020, effective January 1, 2020, adjusting Retained Earnings by a negative $3,395. Retained earnings for the six months ended June 30, 2020 have not been restated.

[2] The Company adopted ASU 2016-13 at December 31, 2020, effective January 1, 2020, adjusting Retained Earnings by a negative $3,395. Prior year periods have not been restated.