Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
INTEREST AND DIVIDEND INCOME
Loans, including fees	$ 109,358	$ 119,503
Interest and dividends on securities:
Taxable	11,127	16,986
Tax-exempt	3,910	4,456
Total interest and dividends on securities	15,037	21,442
Other interest income	659	1,503
Total interest and dividend income	125,054	142,448
INTEREST EXPENSE
Interest bearing demand deposits	1,043	3,394
Money market deposits	578	2,352
Savings deposits	264	923
Certificates of deposit	2,370	4,054
Total interest expense on deposits	4,255	10,723
Federal Home Loan Bank borrowings	2,414	8,232
Other short-term borrowings	118	870
Subordinated debt and junior subordinated debt	1,789	2,461
Total interest expense	8,576	22,286
NET INTEREST INCOME	116,478	120,162
Provision for credit losses	(27,958)	29,821
Net interest income after provision for credit losses	144,436	90,341
NON-INTEREST INCOME
Electronic banking fees	4,365	4,254
Net securities brokerage revenue	1,524	1,679
Bank-owned life insurance	1,709	1,769
Mortgage banking income	4,264	1,276
Net securities gains	279	1,491
Net gain on other real estate owned and other assets	175	169
Other income	8,367	3,802
Total non-interest income	33,208	28,009
NON-INTEREST EXPENSE
Salaries and wages	36,890	38,910
Employee benefits	10,266	10,373
Net occupancy	7,177	7,084
Equipment and software	6,765	6,039
Marketing	2,384	1,138
FDIC insurance	1,282	2,113
Amortization of intangible assets	2,896	3,374
Restructuring and merger-related expense	851	5,164
Other operating expenses	17,816	17,138
Total non-interest expense	86,327	91,333
Income before provision for income taxes	91,317	27,017
Provision for income taxes	18,202	3,621
Net income	73,115	23,396
Preferred stock dividends	2,531
Net income available to common shareholders	$ 70,584	$ 23,396
EARNINGS PER COMMON SHARE
Basic	$ 1.05	$ 0.35
Diluted	$ 1.05	$ 0.35
AVERAGE COMMON SHARES OUTSTANDING
Basic	67,263,714	67,486,550
Diluted	67,355,418	67,587,446
DIVIDENDS DECLARED PER COMMON SHARE	$ 0.33	$ 0.32
COMPREHENSIVE INCOME	$ 51,559	$ 63,336
Total Trust Fees [Member]
NON-INTEREST INCOME
NON-INTEREST INCOME	7,631	6,952
Service Charges on Deposits [Member]
NON-INTEREST INCOME
NON-INTEREST INCOME	$ 4,894	$ 6,617