CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Interest income:
Loans receivable	$ 407,828	$ 390,343	$ 410,907
Mortgage-backed securities	30,804	21,463	17,416
Taxable investment securities	3,070	2,616	1,985
Tax-free investment securities	2,767	2,485	2,060
FHLB stock dividends	730	407	981
Interest-earning deposits	3,599	1,194	719
Total interest income	448,798	418,508	434,068
Interest expense:
Deposits	14,120	19,122	35,896
Borrowed funds	13,997	8,124	6,444
Total interest expense	28,117	27,246	42,340
Net interest income	420,681	391,262	391,728
Current period provision	17,860	(11,883)	83,975
Net interest income after provision for credit losses	402,821	403,145	307,753
Noninterest income:
(Loss)/gain on sale of investments	(8)	(176)	236
Gain on sale of loans	0	0	1,302
Service charges and fees	55,188	51,837	55,613
Trust and other financial services income	27,765	27,921	20,922
Insurance commission income	0	3,633	9,132
Gain/(loss) on real estate owned, net	603	442	(106)
Income from bank-owned life insurance	7,129	6,050	5,190
Mortgage banking income	4,865	15,892	31,391
Gain on sale of insurance business	0	25,327	0
Other operating income	15,307	11,963	8,585
Total noninterest income	110,849	142,889	132,265
Noninterest expense:
Compensation and employee benefits	188,359	193,887	178,375
Premises and occupancy costs	29,618	31,073	30,622
Office operations	13,318	13,769	15,728
Collections expense	1,808	1,932	3,275
Processing expenses	52,496	55,763	50,050
Marketing expenses	9,095	8,237	7,695
Federal deposit insurance premiums	4,778	4,975	4,767
Professional services	14,703	17,621	12,482
Amortization of intangible assets	4,277	5,553	6,856
Real estate owned expense	223	298	359
Merger, asset disposition and restructuring expense	5,617	3,453	20,789
Other expenses	15,686	8,349	16,494
Total noninterest expense	339,978	344,910	347,492
Income before income taxes	173,692	201,124	92,526
Provision for income taxes:
Federal	30,910	35,306	14,896
State	9,116	11,495	2,776
Total provision for income taxes	40,026	46,801	17,672
Net income available to common shareholders	$ 133,666	$ 154,323	$ 74,854
Basic earnings per share (in dollars per share)	$ 1.05	$ 1.22	$ 0.62
Diluted earnings per share (in dollars per share)	$ 1.05	$ 1.21	$ 0.62