Noninterest Income and Expenses - Summary of Noninterest Income and Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Noninterest Income
Brokerage commissions and fees	$ 1,909	$ 1,732	$ 1,352
Marine finance fees	1,054	1,398	910
Interchange income	13,399	12,335	10,583
BOLI income	3,674	4,291	3,426
SBA gains	2,472	2,474	579
Other	10,545	8,352	6,177
Noninterest Income	55,515	50,645	43,230
Gain on sale of Visa stock	0	0	15,153
Securities gains (losses), net	1,217	(623)	86
Total Noninterest Income	56,732	50,022	58,469
Noninterest Expenses
Salaries and wages	73,829	71,111	65,692
Employee benefits	13,697	12,945	11,732
Outsourced data processing costs	15,077	16,374	14,116
Telephone and data lines	2,958	2,481	2,291
Occupancy	14,284	13,394	13,290
Furniture and equipment	6,245	6,744	6,067
Marketing	4,161	5,085	4,784
Legal and professional fees	8,553	9,961	11,022
FDIC assessments	881	2,195	2,326
Amortization of intangibles	5,826	4,300	3,361
Foreclosed property expense and net loss (gain) on sale	51	461	(300)
Other	15,177	17,222	15,535
Total Noninterest Expenses	160,739	162,273	149,916
Service charges on deposit accounts
Noninterest Income
Revenues	11,529	11,198	10,049
Trust fees
Noninterest Income
Revenues	4,443	4,183	3,705
Mortgage banking fees
Noninterest Income
Revenues	$ 6,490	$ 4,682	$ 6,449