Noninterest Income and Expense - Summary of Noninterest Income and Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Noninterest income
Brokerage commissions and fees	$ 541	$ 461	$ 977	$ 820
Marine finance fees	201	446	563	1,019
Interchange income	3,405	3,076	6,806	6,018
BOLI income	927	1,066	1,842	2,122
SBA gains	691	748	1,327	1,482
Other income	2,503	1,923	4,769	3,562
Noninterest income, gross	14,043	12,769	26,888	25,167
Securities losses, net	(466)	(48)	(475)	(150)
Total	13,577	12,721	26,413	25,017
Noninterest expense
Salaries and wages	19,420	16,429	37,926	31,810
Employee benefits	3,195	3,034	7,401	6,115
Outsourced data processing costs	3,876	3,393	7,721	7,072
Telephone/data lines	893	643	1,704	1,255
Occupancy	3,741	3,316	7,548	6,433
Furniture and equipment	1,544	1,468	3,301	2,925
Marketing	1,211	1,344	2,343	2,596
Legal and professional fees	2,033	2,301	4,880	4,274
FDIC assessments	337	595	825	1,193
Amortization of intangibles	1,456	1,004	2,914	1,993
Foreclosed property expense and net (gain)/loss on sale	(174)	405	(214)	597
Other	3,468	4,314	7,750	9,147
Total	41,000	38,246	84,099	75,410
Service charges on deposit accounts
Noninterest income
Revenue from contracts with customers	2,894	2,674	5,591	5,346
Trust fees
Noninterest income
Revenue from contracts with customers	1,147	1,039	2,164	2,060
Mortgage banking fees
Noninterest income
Revenue from contracts with customers	$ 1,734	$ 1,336	$ 2,849	$ 2,738