Noninterest Income and Expense - Summary of Noninterest Income and Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Noninterest income
Brokerage commissions and fees	$ 449	$ 444	$ 1,426	$ 1,264
Marine finance fees	152	194	715	1,213
Interchange income	3,206	3,119	10,012	9,137
BOLI income	928	1,078	2,770	3,200
SBA gains	569	473	1,896	1,955
Other income	3,198	1,980	7,967	5,542
Noninterest income, gross	14,790	12,339	41,678	37,506
Securities losses, net	(847)	(48)	(1,322)	(198)
Total	13,943	12,291	40,356	37,308
Noninterest expense
Salaries and wages	18,640	17,129	56,566	48,939
Employee benefits	2,973	3,205	10,374	9,320
Outsourced data processing costs	3,711	3,493	11,432	10,565
Telephone/data lines	603	624	2,307	1,879
Occupancy	3,368	3,214	10,916	9,647
Furniture and equipment	1,528	1,367	4,829	4,292
Marketing	933	1,139	3,276	3,735
Legal and professional fees	1,648	2,019	6,528	6,293
FDIC assessments	56	431	881	1,624
Amortization of intangibles	1,456	1,004	4,370	2,997
Foreclosed property expense and net (gain)/loss on sale	262	(136)	48	461
Other	3,405	3,910	11,155	13,057
Total	38,583	37,399	122,682	112,809
Service charges on deposit accounts
Noninterest income
Revenue from contracts with customers	2,978	2,833	8,569	8,179
Trust fees
Noninterest income
Revenue from contracts with customers	1,183	1,083	3,347	3,143
Mortgage banking fees
Noninterest income
Revenue from contracts with customers	$ 2,127	$ 1,135	$ 4,976	$ 3,873