CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Interest Income:
Interest and fees on loans	$ 150,868	$ 135,170	$ 123,369
Interest on loans held for sale	387	544	312
Interest on deposits with banks	213	98	85
Interest and dividends on investment securities:
Taxable	11,500	14,440	15,377
Exempt from federal income taxes	7,583	8,059	9,222
Interest on federal funds sold	5	1	1
Total interest income	170,556	158,312	148,366
Interest Expense:
Interest on deposits	8,161	5,878	4,791
Interest on retail repurchase agreements and federal funds purchased	290	255	164
Interest on advances from FHLB	11,610	13,081	12,982
Interest on subordinated debt	943	899	881
Total interest expense	21,004	20,113	18,818
Net interest income	149,552	138,199	129,548
Provision (credit) for loan losses	5,546	5,371	(163)
Net interest income after provision (credit) for loan losses	144,006	132,828	129,711
Non-interest Income:
Investment securities gains	1,932	36	5
Service charges on deposit accounts	7,953	7,607	8,422
Mortgage banking activities	4,049	3,114	1,994
Wealth management income	17,805	19,931	19,086
Insurance agency commissions	5,408	5,176	4,996
Income from bank owned life insurance	2,462	2,571	2,444
Visa check fees	4,674	4,652	4,439
Other income	6,759	6,814	5,485
Total non-interest income	51,042	49,901	46,871
Non-interest Expenses:
Salaries and employee benefits	71,354	71,003	66,387
Occupancy expense of premises	12,960	12,809	13,692
Equipment expenses	6,883	6,071	5,188
Marketing	2,851	2,896	2,926
Outside data services	5,377	5,023	4,947
FDIC insurance	2,741	2,491	2,302
Amortization of intangible assets	130	372	821
Litigation Expense	0	(3,869)	6,519
Other Expense	20,762	18,551	18,018
Total non-interest expenses	123,058	115,347	120,800
Income before income taxes	71,990	67,382	55,782
Income tax expense	23,740	22,027	17,582
Net income	$ 48,250	$ 45,355	$ 38,200
Net Income Per Share Amounts:
Basic net income per share	$ 2	$ 1.84	$ 1.53
Diluted net income per share	2	1.84	1.52
Dividends declared per share	$ 0.98	$ 0.9	$ 0.76