Noninterest Income and Expenses - Summary of Noninterest Income and Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income
Interchange income	$ 13,711	$ 13,399	$ 12,335
Marine finance fees	690	1,054	1,398
SBA gains	685	2,472	2,474
BOLI income	3,561	3,674	4,291
Other income	10,056	10,545	8,352
Noninterest Income	60,335	55,515	50,645
Securities gains (losses), net	1,235	1,217	(623)
Total Noninterest Income	61,570	56,732	50,022
Noninterest Expenses
Salaries and wages	88,539	73,829	71,111
Employee benefits	15,544	13,697	12,945
Outsourced data processing costs	19,053	15,077	16,374
Telephone and data lines	2,984	2,958	2,481
Occupancy	14,150	14,284	13,394
Furniture and equipment	5,874	6,245	6,744
Marketing	4,833	4,161	5,085
Legal and professional fees	9,167	8,553	9,961
FDIC assessments	1,268	881	2,195
Amortization of intangibles	5,857	5,826	4,300
Foreclosed property expense and net loss on sale	2,263	51	461
Provision for credit losses on unfunded commitments	185	0	0
Other	15,835	15,177	17,222
Total Noninterest Expenses	185,552	160,739	162,273
Service charges on deposit accounts
Income
Revenues	9,429	11,529	11,198
Wealth management income
Income
Revenues	7,507	6,352	5,915
Mortgage banking fees
Income
Revenues	$ 14,696	$ 6,490	$ 4,682