Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Interest and dividend income:
Loans, including fees	$ 242,269	$ 233,721	$ 223,750
Investments:
Taxable securities	29,361	27,627	39,810
Tax exempt securities	3,568	3,566	4,002
Dividends	991	1,032	1,285
Interest bearing cash at Federal Reserve and other banks	858	1,238	3,597
Total interest and dividend income	277,047	267,184	272,444
Interest expense:
Deposits	3,318	6,885	11,716
Other borrowings	22	17	387
Junior subordinated debt	2,168	2,555	3,272
Total interest expense	5,508	9,457	15,375
Net interest income	271,539	257,727	257,069
Provision for (benefit from) credit losses	(6,775)	42,813	(1,690)
Net interest income after provision for (benefit from) credit losses	278,314	214,914	258,759
Noninterest income:
Service charges and fees	43,948	37,981	40,417
Commissions on sale of non-deposit investment products	3,668	2,989	2,877
Increase in cash value of life insurance	2,775	2,949	3,029
Gain on sale of loans	9,580	9,122	3,282
Gain on sale of investment securities	0	7	110
Other	3,693	2,146	3,805
Total noninterest income	63,664	55,194	53,520
Noninterest expense:
Salaries and related benefits	106,351	112,121	106,065
Other	71,924	70,637	79,392
Total noninterest expense	178,275	182,758	185,457
Income before income taxes	163,703	87,350	126,822
Provision for income taxes	46,048	22,536	34,750
Net income	$ 117,655	$ 64,814	$ 92,072
Earnings per share:
Basic (in USD per share)	$ 3.96	$ 2.17	$ 3.02
Diluted (in USD per share)	$ 3.94	$ 2.16	$ 3.00