Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Interest income:
Interest and fees on loans	$ 352,993	$ 293,546	$ 296,611
Interest and dividends on investment securities:
Taxable	12,712	4,413	6,456
Tax-exempt	3,893	2,403	2,797
Dividends	1,655	971	1,642
Interest on federal funds sold and other short-term investments	2,493	405	694
Total interest income	373,746	301,738	308,200
Interest expense:
Deposits	50,561	24,768	52,386
Borrowings	21,066	14,092	17,823
Total interest expense	71,627	38,860	70,209
Net interest income	302,119	262,878	237,991
Provision for (reversal of) credit losses	17,750	(5,500)	41,000
Net interest income after provision for credit losses	284,369	268,378	196,991
Noninterest income:
Deposit, loan and other income	7,472	6,617	7,077
Income on bank owned life insurance	5,597	4,771	5,007
Net gains on sale of loans held-for-sale	1,695	3,807	2,085
Gain on sale of branches	0	674	0
Net (losses) gains on equity securities	(1,521)	(373)	202
Net gains on sale/redemption of investment securities	0	195	29
Total noninterest income	13,243	15,691	14,400
Noninterest expense:
Salaries and employee benefits	81,289	64,341	58,877
Occupancy and equipment	9,865	11,638	13,882
FDIC insurance	2,881	2,665	4,002
Professional and consulting	8,053	8,286	7,383
Marketing and advertising	1,692	1,318	1,200
Information technology and communications	11,108	11,267	6,008
Merger expenses	0	0	14,640
Amortization of core deposit intangible	1,685	1,981	2,559
Net periodic pension income	(572)	(269)	(119)
Increase in value of acquisition price	1,516	0	2,333
Other expenses	8,871	7,784	10,236
Total noninterest expenses	126,388	109,011	121,001
Income before income tax expense	171,224	175,058	90,390
Income tax expense	46,013	44,705	19,101
Net income	125,211	130,353	71,289
Preferred dividends	6,037	1,717	0
Net income available to common stockholders	$ 119,174	$ 128,636	$ 71,289
Earnings per common share:
Basic (in dollars per share)	$ 3.03	$ 3.24	$ 1.80
Diluted (in dollars per share)	$ 3.01	$ 3.22	$ 1.79