Noninterest Income and Expense - Summary of Noninterest Income and Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Noninterest income
Service charges on deposit accounts	$ 2,672	$ 2,422
Trust fees	1,021	880
Mortgage banking fees	1,402	1,552
Brokerage commissions and fees	359	377
Marine finance fees	573	134
Interchange income	2,942	2,494
BOLI income	1,056	733
Other income	2,373	1,313
Noninterest Income	12,398	9,905
Securities losses, net	(102)	0
TOTAL	12,296	9,905
Noninterest expense
Salaries and wages	15,381	15,369
Employee benefits	3,081	3,068
Outsourced data processing costs	3,679	3,269
Telephone/data lines	612	532
Occupancy	3,117	3,157
Furniture and equipment	1,457	1,391
Marketing	1,252	922
Legal and professional fees	1,973	2,132
FDIC assessments	598	570
Amortization of intangibles	989	719
Net losses (gains) and disposition expense on other real estate owned	192	(293)
Other	4,833	3,910
TOTAL	$ 37,164	$ 34,746