Consolidated Statements of Income and Comprehensive Income (unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Interest income
Interest and fees on loans	$ 271,964	$ 177,566
Interest on taxable securities	14,300	4,239
Interest on nontaxable securities	339	186
Interest on deposits in other banks and federal funds sold	9,113	1,383
Total interest income	295,716	183,374
Interest expense
Interest on deposits	53,182	4,092
Interest on other borrowings	30,882	6,738
Total interest expense	84,064	10,830
Net interest income	211,652	172,544
Provision for loan losses	49,376	(2,734)
Provision for unfunded commitments	346	9,009
Provision for other credit losses	7	(44)
Provision for credit losses	49,729	6,231
Net interest income after provision for credit losses	161,923	166,313
Noninterest income
Service charges on deposit accounts	10,936	11,058
Mortgage banking activity	31,392	62,938
Other service charges, commissions and fees	971	939
Net gain (loss) on securities	6	(27)
Other noninterest income	12,745	12,003
Total noninterest income	56,050	86,911
Noninterest expense
Salaries and employee benefits	80,910	84,281
Occupancy and equipment	12,986	12,727
Data processing and communications expenses	13,034	12,572
Credit resolution-related expenses	435	(965)
Advertising and marketing	3,532	1,988
Amortization of intangible assets	4,706	5,181
Merger and conversion charges	0	977
Loan servicing expense	8,331	8,919
Other noninterest expenses	15,487	18,140
Total noninterest expense	139,421	143,820
Income before income tax expense	78,552	109,404
Income tax expense	18,131	27,706
Net income	60,421	81,698
Other comprehensive loss
Net unrealized holding gains (losses) arising during period on debt securities available-for-sale, net of tax expense (benefit) of $3,719 and $(4,633)	10,926	(17,431)
Total other comprehensive loss	10,926	(17,431)
Comprehensive income	$ 71,347	$ 64,267
Basic earnings per common share (in dollars per share)	$ 0.87	$ 1.18
Diluted earnings per common share (in dollars per share)	$ 0.87	$ 1.17
Weighted average common shares outstanding
Basic (in shares)	69,172	69,346
Diluted (in shares)	69,323	69,661