Other Noninterest Expense - Summary of Other Noninterest Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Other Income and Expenses [Abstract]
Lending and other client related processing costs	$ 7,516	$ 9,158
Correspondent bank fees	4,301	3,986
Investment banking activities	6,730	3,030
Trade order execution costs	2,988	2,745
Data processing services	4,606	3,454
Telephone	1,872	2,227
Dues and publications	1,103	1,130
Postage and supplies	570	856
Other	15,770	14,117
Total other noninterest expense	$ 45,456	$ 40,703