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	$ 415,965	$ 465,677	$ 393,166
Interest and dividends on securities:
Taxable	50,401	53,594	65,648
Tax-exempt	16,161	16,999	20,006
Total interest and dividends on securities	66,562	70,593	85,654
Other interest income	2,440	5,007	5,433
Total interest and dividend income	484,967	541,277	484,253
INTEREST EXPENSE
Interest bearing demand deposits	3,669	7,069	16,805
Money market deposits	1,803	4,616	8,024
Savings deposits	1,031	1,802	2,995
Certificates of deposit	7,623	13,562	15,631
Total interest expense on deposits	14,126	27,049	43,455
Federal Home Loan Bank borrowings	6,167	24,701	26,548
Other short-term borrowings	227	1,729	5,401
Subordinated debt and junior subordinated debt	6,514	8,318	8,945
Total interest expense	27,034	61,797	84,349
NET INTEREST INCOME	457,933	479,480	399,904
Provision for credit losses	(64,274)	107,741	11,198
Net interest income after provision for credit losses	522,207	371,739	388,706
NON-INTEREST INCOME
Trust fees	29,511	26,335	26,579
Service charges on deposits	22,412	21,943	26,974
Electronic banking fees	19,318	17,524	22,634
Net securities brokerage revenue	6,896	6,189	6,990
Bank-owned life insurance	8,936	7,359	5,913
Mortgage banking income	19,528	22,736	8,219
Net securities gains	1,113	4,268	4,320
Net gains on other real estate owned and other assets	4,816	103	732
Other income	20,255	21,728	14,355
Total non-interest income	132,785	128,185	116,716
NON-INTEREST EXPENSE
Salaries and wages	154,242	153,166	132,485
Employee benefits	41,033	41,723	39,313
Net occupancy	26,843	27,580	22,505
Equipment and software	30,006	24,801	20,494
Marketing	8,634	5,957	6,062
FDIC insurance	4,150	7,734	1,956
Amortization of intangible assets	11,457	13,411	10,340
Restructuring and merger-related expense	6,717	9,725	16,397
Other operating expenses	70,061	70,748	62,656
Total non-interest expense	353,143	354,845	312,208
Income before provision for income taxes	301,849	145,079	193,214
Provision for income taxes	59,589	23,035	34,341
Net income	242,260	122,044	158,873
Preferred stock dividends	10,125	2,644
Net income available to common shareholders	$ 232,135	$ 119,400	$ 158,873
EARNINGS PER COMMON SHARE
Basic	$ 3.54	$ 1.78	$ 2.83
Diluted	$ 3.53	$ 1.77	$ 2.83
AVERAGE COMMON SHARES OUTSTANDING
Basic	65,520,527	67,260,796	56,108,084
Diluted	65,669,970	67,310,584	56,214,364
DIVIDENDS DECLARED PER COMMON SHARE	$ 1.32	$ 1.28	$ 1.24