Other Noninterest Expense - Summary of Other Noninterest Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Other Income and Expenses [Abstract]
Lending and other client related processing costs	$ 9,158	$ 5,177
Correspondent bank fees	3,986	3,744
Investment banking activities	3,030	4,185
Trade order execution costs	2,745	2,516
Data processing services	3,454	2,899
Telephone	2,227	2,741
Dues and publications	1,130	1,524
Postage and supplies	856	770
Other	14,117	9,980
Total other noninterest expense	$ 40,703	$ 33,536