CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Cumulative Effect, Period of Adoption, Adjustment	Cumulative Effect, Period of Adoption, Adjusted Balance	Common Stock	Common Stock Cumulative Effect, Period of Adoption, Adjusted Balance	Capital Surplus	Capital Surplus Cumulative Effect, Period of Adoption, Adjusted Balance	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Retained Earnings Cumulative Effect, Period of Adoption, Adjusted Balance	Accumulated Other Comprehensive Income (Loss)	Accumulated Other Comprehensive Income (Loss) Cumulative Effect, Period of Adoption, Adjusted Balance
Balance at Dec. 31, 2019	$ 709,865	$ (5,508)	$ 704,357	$ 291	$ 291	$ 541,299	$ 541,299	$ 163,375	$ (5,508)	$ 157,867	$ 4,900	$ 4,900
Balance (in shares) at Dec. 31, 2019				29,110,572	29,110,572
Net income	45,534							45,534
Other comprehensive income (loss)	29,531										29,531
Cash dividends declared	(8,165)							(8,165)
Common stock issued in connection with the exercise of stock options, restricted stock awards and the ESPP (in shares)				288,508
Common stock issued in connection with the exercise of stock options, restricted stock awards and the ESPP	2,569			$ 3		2,566
Repurchase of common stock (in shares)				(736,004)
Repurchase of common stock	(18,582)			$ (7)		(18,575)
Stock based compensation expense	3,425					3,425
Balance at Dec. 31, 2020	758,669			$ 287		528,715		195,236			34,431
Balance (in shares) at Dec. 31, 2020				28,663,076
Net income	81,553							81,553
Other comprehensive income (loss)	(16,189)										(16,189)
Cash dividends declared	(9,697)							(9,697)
Common stock issued in connection with the exercise of stock options, restricted stock awards and the ESPP (in shares)				411,482
Common stock issued in connection with the exercise of stock options, restricted stock awards and the ESPP	3,812			$ 4		3,808
Repurchase of common stock (in shares)				(228,655)
Repurchase of common stock	(5,659)			$ (2)		(5,657)
Stock based compensation expense	3,979					3,979
Balance at Dec. 31, 2021	816,468			$ 289		530,845		267,092			18,242
Balance (in shares) at Dec. 31, 2021				28,845,903
Net income	51,432							51,432
Other comprehensive income (loss)	(161,503)										(161,503)
Cash dividends declared	(15,378)							(15,378)
Common stock issued in connection with the exercise of stock options, restricted stock awards and the ESPP (in shares)				925,721
Common stock issued in connection with the exercise of stock options, restricted stock awards and the ESPP	77			$ 9		68
Repurchase of common stock (in shares)				(831,911)
Repurchase of common stock	(23,605)			$ (8)		(23,597)
Stock based compensation expense	9,042					9,042
Impact of merger wit CBTX (in shares)				24,015,272
Impact of merger with CBTX	706,643			$ 240		706,403
Balance at Dec. 31, 2022	$ 1,383,176			$ 530		$ 1,222,761		$ 303,146			$ (143,261)
Balance (in shares) at Dec. 31, 2022				52,954,985