Consolidated Statements of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
INTEREST AND DIVIDEND INCOME
Loans, including fees	$ 105,968	$ 115,068	$ 215,327	$ 234,571
Interest and dividends on securities:
Taxable	12,900	14,047	24,027	31,034
Tax-exempt	3,952	4,302	7,862	8,758
Total interest and dividends on securities	16,852	18,349	31,889	39,792
Other interest income	507	1,277	1,166	2,779
Total interest and dividend income	123,327	134,694	248,382	277,142
INTEREST EXPENSE
Interest bearing demand deposits	1,009	1,350	2,052	4,745
Money market deposits	551	879	1,130	3,231
Savings deposits	261	297	525	1,220
Certificates of deposit	2,026	3,514	4,396	7,568
Total interest expense on deposits	3,847	6,040	8,103	16,764
Federal Home Loan Bank borrowings	1,781	7,293	4,195	15,525
Other short-term borrowings	40	279	159	1,149
Subordinated debt and junior subordinated debt	1,804	2,069	3,593	4,530
Total interest expense	7,472	15,681	16,050	37,968
NET INTEREST INCOME	115,855	119,013	232,332	239,174
Provision for credit losses	(21,025)	61,841	(48,984)	91,661
Net interest income after provision for credit losses	136,880	57,172	281,316	147,513
NON-INTEREST INCOME
Electronic banking fees	5,060	4,066	9,426	8,320
Net securities brokerage revenue	1,829	1,384	3,352	3,063
Bank-owned life insurance	1,707	1,752	3,416	3,521
Mortgage banking income	7,830	7,531	12,094	8,807
Net securities gains	477	1,299	756	2,790
Net gain (loss) on other real estate owned and other assets	4,014	(66)	4,189	103
Other income	3,171	6,369	11,537	10,171
Total non-interest income	36,112	32,860	69,320	60,869
NON-INTEREST EXPENSE
Salaries and wages	37,435	36,773	74,324	75,683
Employee benefits	9,268	10,138	19,534	20,511
Net occupancy	6,427	6,634	13,605	13,717
Equipment and software	7,281	5,722	14,045	11,761
Marketing	1,802	1,567	4,185	2,705
FDIC insurance	181	2,395	1,462	4,508
Amortization of intangible assets	2,873	3,365	5,769	6,739
Restructuring and merger-related expense	1,222	468	2,074	5,633
Other operating expenses	17,323	18,440	35,141	35,578
Total non-interest expense	83,812	85,502	170,139	176,835
Income before provision for income taxes	89,180	4,530	180,497	31,547
Provision for income taxes	18,592	42	36,793	3,663
Net income	70,588	4,488	143,704	27,884
Preferred stock dividends	2,531		5,063
Net income available to common shareholders	$ 68,057	$ 4,488	$ 138,641	$ 27,884
EARNINGS PER COMMON SHARE
Basic	$ 1.02	$ 0.07	$ 2.07	$ 0.41
Diluted	$ 1.01	$ 0.07	$ 2.06	$ 0.41
AVERAGE COMMON SHARES OUTSTANDING
Basic	66,894,398	67,104,628	67,078,036	67,295,589
Diluted	67,066,592	67,181,755	67,239,548	67,410,460
DIVIDENDS DECLARED PER COMMON SHARE	$ 0.33	$ 0.32	$ 0.66	$ 0.64
COMPREHENSIVE INCOME	$ 73,371	$ 3,863	$ 124,931	$ 67,199
Total Trust Fees [Member]
NON-INTEREST INCOME
NON-INTEREST INCOME	7,148	6,202	14,780	13,154
Service Charges on Deposits [Member]
NON-INTEREST INCOME
NON-INTEREST INCOME	$ 4,876	$ 4,323	$ 9,770	$ 10,940