CONSOLIDATED STATEMENTS OF NET INCOME - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
INTEREST AND DIVIDEND INCOME
Loans, including fees		$ 270,460	$ 300,960	$ 300,625
Investment securities:
Taxable		15,706	14,918	14,733
Tax-exempt		2,593	3,497	3,302
Dividends		503	1,089	1,824
Total Interest and Dividend Income		289,262	320,464	320,484
INTEREST EXPENSE
Deposits		10,757	35,986	63,026
Borrowings and junior subordinated debt securities		2,393	5,090	10,667
Total Interest Expense		13,150	41,076	73,693
NET INTEREST INCOME		276,112	279,388	246,791
Provision for credit losses	[1]	16,215	131,424	14,873
Net Interest Income After Provision for Credit Losses		259,897	147,964	231,918
NONINTEREST INCOME
Net gain (loss) on sale of securities		29	142	(26)
Mortgage banking		9,734	10,923	2,491
Commercial loan swap income		1,146	4,740	5,503
Other		7,820	5,267	9,246
Total Noninterest Income		64,610	59,719	52,558
NONINTEREST EXPENSE
Salaries and employee benefits		100,214	90,115	83,986
Data processing and information technology		16,681	15,499	14,468
Occupancy		14,544	14,529	12,103
Furniture, equipment and software		10,684	11,050	8,958
Other taxes		6,644	6,622	3,364
Professional services and legal		6,368	6,394	4,244
Marketing		4,553	5,996	4,631
FDIC insurance		4,224	5,089	758
Merger related expenses		0	2,342	11,350
Other		24,927	29,008	23,254
Total Noninterest Expense		188,839	186,644	167,116
Income Before Taxes		135,668	21,039	117,360
Income taxes (benefit) expense		25,325	(1)	19,126
Net Income		$ 110,343	$ 21,040	$ 98,234
Earnings per common share—basic (in dollars per share)		$ 2.81	$ 0.54	$ 2.84
Earnings per common share—diluted (in dollars per share)		2.81	0.53	2.82
Dividends declared per common share (in dollars per share)		$ 1.13	$ 1.12	$ 1.09
Debit and credit card
NONINTEREST INCOME
Revenue from contract with customer		$ 17,952	$ 15,093	$ 13,405
Service charges on deposit accounts
NONINTEREST INCOME
Revenue from contract with customer		15,040	13,597	13,316
Wealth management
NONINTEREST INCOME
Revenue from contract with customer		$ 12,889	$ 9,957	$ 8,623

[1] (1)Beginning January 1, 2020, provision for credit losses is based on current expected credit loss methodology due to the adoption of CECL. Prior to January 1, 2020, it was based on incurred loss methodology.