CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Interest and fees on loans
Taxable	$ 196,733	$ 181,451	$ 150,295
Tax exempt	951	814	729
Interest and dividends on securities
Taxable	8,909	9,717	9,218
Tax exempt	7,127	6,079	5,102
Interest on short-term investments	1,490	909	354
Total interest income	215,210	198,970	165,698
Interest on deposits	57,148	44,913	27,026
Interest on borrowings
Short-term	1,311	1,143	1,446
Long-term	1,704	1,643	1,334
Total interest expense	60,163	47,699	29,806
NET INTEREST INCOME	155,047	151,271	135,892
Provision for loan losses	3,235	6,400	3,000
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES	151,812	144,871	132,892
NONINTEREST INCOME
Wealth advisory fees	6,835	6,344	5,481
Investment brokerage fees	1,687	1,458	1,273
Service charges on deposit accounts	15,717	15,831	13,696
Loan and service fees	9,911	9,291	7,900
Merchant and interchange fee income	2,641	2,461	2,279
Bank owned life insurance income	1,890	1,244	1,768
Mortgage banking income	1,626	1,150	982
Net securities gains (losses)	142	(50)	32
Other income	4,548	2,573	2,629
Total noninterest income	44,997	40,302	36,040
NONINTEREST EXPENSE
Salaries and employee benefits	49,434	48,353	45,306
Net occupancy expense	5,295	5,149	4,595
Equipment costs	5,521	5,243	4,629
Data processing fees and supplies	10,407	9,685	8,233
Corporate and business development	4,371	5,066	4,744
FDIC insurance and other regulatory fees	638	1,701	1,798
Professional fees	4,644	3,798	3,574
Other expense	9,114	7,234	6,419
Total noninterest expense	89,424	86,229	79,298
INCOME BEFORE INCOME TAX EXPENSE	107,385	98,944	89,634
Income tax expense	20,338	18,533	32,304
NET INCOME	$ 87,047	$ 80,411	$ 57,330
BASIC WEIGHTED AVERAGE COMMON SHARES	25,588,404	25,288,533	25,181,208
BASIC EARNINGS PER COMMON SHARE	$ 3.40	$ 3.18	$ 2.28
DILUTED WEIGHTED AVERAGE COMMON SHARES	25,758,893	25,727,831	25,663,381
DILUTED EARNINGS PER COMMON SHARE	$ 3.38	$ 3.13	$ 2.23