Consolidated Statements of Income - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Interest, fee and dividend income
Interest and fees on loans		$ 302,175	$ 307,859	$ 321,474
Securities available for sale		23,305	22,434	23,303
Securities held to maturity		12,551	15,283	19,105
Other		1,845	2,706	3,652
Total interest, fee and dividend income		339,876	348,282	367,534
Interest expense
Deposits		10,714	22,070	39,986
Short-term borrowings		158	3,408	9,693
Long-term debt		389	1,553	1,875
Subordinated debt		5,437	2,842	0
Junior subordinated debt		2,090	2,731	4,425
Total interest expense		18,788	32,604	55,979
Net interest income		321,088	315,678	311,555
Provision for loan losses	[1]	(8,257)	51,134	25,412
Net interest income after provision for loan losses		329,345	264,544	286,143
Noninterest income
Service charges on deposit accounts		13,348	13,201	17,151
ATM and debit card fees		31,301	25,960	23,893
Retirement plan administration fees		42,188	35,851	30,388
Wealth management		33,718	29,247	28,400
Insurance services		14,083	14,757	15,770
Bank owned life insurance income		6,217	5,743	5,355
Net securities gains (losses)		566	(388)	4,213
Other		16,373	21,905	18,853
Total noninterest income		157,794	146,276	144,023
Noninterest expense
Salaries and employee benefits		172,580	161,934	156,867
Occupancy		21,922	21,634	22,706
Data processing and communications		16,989	16,527	18,318
Professional fees and outside services		16,306	15,082	14,785
Equipment		21,854	19,889	18,583
Office supplies and postage		6,006	6,138	6,579
FDIC expense		3,041	2,688	1,946
Advertising		2,521	2,288	2,773
Amortization of intangible assets		2,808	3,395	3,579
Loan collection and other real estate owned, net		2,915	3,295	4,158
Other		20,339	24,863	24,440
Total noninterest expense		287,281	277,733	274,734
Income before income tax expense		199,858	133,087	155,432
Income tax expense		44,973	28,699	34,411
Net income		$ 154,885	$ 104,388	$ 121,021
Earnings per share
Basic (in dollars per share)		$ 3.57	$ 2.39	$ 2.76
Diluted (in dollars per share)		$ 3.54	$ 2.37	$ 2.74

[1] Beginning January 1, 2020, calculation is based on current expected loss methodology. Prior to January 1, 2020, calculation was based on incurred loss methodology.