CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Interest and fees on loans
Taxable	$ 176,538	$ 196,733	$ 181,451
Tax exempt	647	951	814
Interest and dividends on securities
Taxable	6,973	8,909	9,717
Tax exempt	8,577	7,127	6,079
Interest on short-term investments	368	1,490	909
Total interest income	193,103	215,210	198,970
Interest on deposits	29,342	57,148	44,913
Interest on borrowings
Short-term	506	1,311	1,143
Long-term	247	1,704	1,643
Total interest expense	30,095	60,163	47,699
NET INTEREST INCOME	163,008	155,047	151,271
Provision for loan losses	14,770	3,235	6,400
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES	148,238	151,812	144,871
NONINTEREST INCOME
Wealth advisory fees	7,468	6,835	6,344
Investment brokerage fees	1,670	1,687	1,458
Service charges on deposit accounts	10,110	15,717	15,831
Loan and service fees	10,085	9,911	9,291
Merchant and interchange fee income	2,408	2,641	2,461
Bank owned life insurance income	2,105	1,890	1,244
Interest rate swap fee income	5,089	1,691	475
Mortgage banking income	3,911	1,626	1,150
Net securities gains (losses)	433	142	(50)
Other income	3,564	2,857	2,098
Total noninterest income	46,843	44,997	40,302
NONINTEREST EXPENSE
Salaries and employee benefits	49,413	48,742	47,645
Net occupancy expense	5,851	5,295	5,149
Equipment costs	5,766	5,521	5,243
Data processing fees and supplies	11,864	10,407	9,685
Corporate and business development	3,093	4,371	5,066
FDIC insurance and other regulatory fees	1,707	638	1,701
Professional fees	5,314	4,644	3,798
Other expense	8,197	9,806	7,942
Total noninterest expense	91,205	89,424	86,229
INCOME BEFORE INCOME TAX EXPENSE	103,876	107,385	98,944
Income tax expense	19,539	20,338	18,533
NET INCOME	$ 84,337	$ 87,047	$ 80,411
BASIC WEIGHTED AVERAGE COMMON SHARES	25,469,242	25,588,404	25,288,533
BASIC EARNINGS PER COMMON SHARE	$ 3.31	$ 3.40	$ 3.18
DILUTED WEIGHTED AVERAGE COMMON SHARES	25,573,941	25,758,893	25,727,831
DILUTED EARNINGS PER COMMON SHARE	$ 3.30	$ 3.38	$ 3.13
Wealth advisory fees
NONINTEREST INCOME
Wealth advisory fees	$ 7,468	$ 6,835	$ 6,344