CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
INTEREST INCOME:
Loans, including fees	$ 325,148	$ 221,075	$ 219,592
Taxable investment securities	19,260	11,384	7,450
Federal Home Loan Bank stock and other	11,655	11,725	1,364
Total interest income	356,063	244,184	228,406
INTEREST EXPENSE:
Deposits	51,481	6,757	5,039
Securities sold under agreements to repurchase and other short-term borrowings	574	397	63
Federal Home Loan Bank advances	15,230	339	57
Subordinated note			507
Total interest expense	67,285	7,493	5,666
NET INTEREST INCOME	288,778	236,691	222,740
Provision for expected credit loss expense for on-balance sheet exposures (loans and investment securities)	47,624	22,348	14,808
NET INTEREST INCOME AFTER PROVISION	241,154	214,343	207,932
NONINTEREST INCOME:
Mortgage banking income	3,542	6,196	19,994
Program fees	15,582	16,172	14,237
Increase in cash surrender value of bank owned life insurance	2,719	2,526	2,242
Death benefits in excess of cash surrender value of life insurance	1,728		979
Total noninterest income	71,457	89,810	86,575
NONINTEREST EXPENSE:
Salaries and employee benefits	115,869	111,240	110,088
Technology, equipment, and communication	29,107	28,954	29,351
Occupancy	13,967	13,014	13,193
Marketing and development	8,446	6,875	4,390
FDIC insurance expense	2,728	1,668	1,591
Interchange related expense	5,965	4,773	4,960
Legal and professional fees	3,204	4,024	4,924
Merger expense	2,160
Other	17,952	16,760	14,568
Total noninterest expense	199,398	187,308	183,065
INCOME BEFORE INCOME TAX EXPENSE	113,213	116,845	111,442
INCOME TAX EXPENSE	22,839	25,739	23,831
Net income	90,374	91,106	87,611
Service charges on deposit accounts
NONINTEREST INCOME:
Revenue under 606	13,855	13,426	12,553
Net refund transfer fees
NONINTEREST INCOME:
Revenue under 606	15,748	17,080	20,248
Interchange fee income
NONINTEREST INCOME:
Revenue under 606	13,057	13,125	13,062
Net losses on other real estate owned
NONINTEREST INCOME:
Revenue under 606	(211)	(211)	(160)
Contract termination fee
NONINTEREST INCOME:
Revenue under 606		5,000
Legal settlement
NONINTEREST INCOME:
Revenue under 606		13,000
Other
NONINTEREST INCOME:
Revenue under 606	$ 5,437	$ 3,496	$ 3,420
Class A Common Stock
BASIC EARNINGS PER SHARE:
Basic earnings per share (in dollars per share)	$ 4.64	$ 4.60	$ 4.29
DILUTED EARNINGS PER SHARE:
Diluted earnings per share (in dollars per share)	4.62	4.59	4.28
Class B Common Stock
BASIC EARNINGS PER SHARE:
Basic earnings per share (in dollars per share)	4.21	4.19	3.90
DILUTED EARNINGS PER SHARE:
Diluted earnings per share (in dollars per share)	$ 4.20	$ 4.17	$ 3.89