Noninterest Income and Expense - Summary of Noninterest Income and Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Noninterest Income [Abstract]
Interchange income	$ 3,682	$ 3,206	$ 10,115	$ 10,012
Marine finance fees	242	152	545	715
SBA gains	252	569	572	1,896
BOLI income	899	928	2,672	2,770
Other income	2,370	3,198	7,869	7,967
Noninterest income, gross	16,942	14,790	45,387	41,678
Securities gains (losses), net	4	(847)	1,253	(1,322)
Total Noninterest Income (Note H)	16,946	13,943	46,640	40,356
Noninterest expense
Salaries and wages	23,125	18,640	67,049	56,566
Employee benefits	3,995	2,973	11,629	10,374
Outsourced data processing costs	6,128	3,711	14,820	11,432
Telephone/data lines	705	603	2,210	2,307
Occupancy	3,858	3,368	10,596	10,916
Furniture and equipment	1,576	1,528	4,557	4,829
Marketing	1,513	933	3,788	3,276
Legal and professional fees	3,018	1,648	8,658	6,528
FDIC assessments	474	56	740	881
Amortization of intangibles	1,497	1,456	4,436	4,370
Foreclosed property expense and net loss on sale	512	262	442	48
Provision for credit losses on unfunded commitments	756	0	980	0
Other	4,517	3,405	11,966	11,155
Total	51,674	38,583	141,871	122,682
Service charges on deposit accounts
Noninterest Income [Abstract]
Revenue from contracts with customers	2,242	2,978	7,006	8,569
Wealth management income
Noninterest Income [Abstract]
Revenue from contracts with customers	1,972	1,632	5,558	4,773
Mortgage banking fees
Noninterest Income [Abstract]
Revenue from contracts with customers	$ 5,283	$ 2,127	$ 11,050	$ 4,976