CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Interest and fees on loans
Taxable	$ 150,295	$ 124,830	$ 110,097
Tax exempt	729	462	464
Interest and dividends on securities
Taxable	9,218	9,421	8,564
Tax exempt	5,102	3,885	3,355
Interest on short-term investments	354	353	59
Total interest income	165,698	138,951	122,539
Interest on deposits	27,026	18,944	15,415
Interest on borrowings
Short-term	1,446	352	188
Long-term	1,334	1,174	1,009
Total interest expense	29,806	20,470	16,612
NET INTEREST INCOME	135,892	118,481	105,927
Provision for loan losses	3,000	1,150	0
NET INTEREST INCOME AFTER PROVISION FOR LOAN LOSSES	132,892	117,331	105,927
NONINTEREST INCOME
Wealth advisory fees	5,481	4,805	4,531
Investment brokerage fees	1,273	1,010	1,507
Service charges on deposit accounts	13,696	12,013	10,608
Loan and service fees	7,900	7,681	7,460
Merchant and interchange fee income	2,279	2,098	1,843
Bank owned life insurance income	1,768	1,392	1,338
Other income	2,598	2,213	2,974
Mortgage banking income	982	1,586	1,176
Net securities gains	32	66	42
Total noninterest income	36,009	32,864	31,479
NONINTEREST EXPENSE
Salaries and employee benefits	45,510	41,934	38,923
Net occupancy expense	4,595	4,266	3,820
Equipment costs	4,629	3,850	3,598
Data processing fees and supplies	8,233	8,148	7,592
Corporate and business development	4,744	3,328	3,173
FDIC insurance and other regulatory fees	1,798	2,001	2,044
Professional fees	3,574	3,208	2,794
Other expense	6,184	6,243	6,262
Total noninterest expense	79,267	72,978	68,206
INCOME BEFORE INCOME TAX EXPENSE	89,634	77,217	69,200
Income tax expense	32,304	25,133	22,833
NET INCOME	$ 57,330	$ 52,084	$ 46,367
BASIC WEIGHTED AVERAGE COMMON SHARES	25,181,208	25,056,095	24,926,354
BASIC EARNINGS PER COMMON SHARE	$ 2.28	$ 2.08	$ 1.86
DILUTED WEIGHTED AVERAGE COMMON SHARES	25,663,381	25,460,727	25,245,569
DILUTED EARNINGS PER COMMON SHARE	$ 2.23	$ 2.05	$ 1.84