Other Noninterest Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Income and Expenses [Abstract]
Lending and other client related processing costs	$ 28,491	$ 24,237	$ 23,768
Correspondent bank fees	14,503	13,713	12,976
Investment banking activities	13,733	0	0
Trade order execution costs	10,813	0	0
Telephone	9,861	9,404	10,647
Data processing services	12,536	10,811	10,251
Dues and publications	4,603	4,605	3,263
Postage and supplies	3,198	2,799	2,797
Other	54,841	21,682	21,419
Total other noninterest expense	$ 152,579	$ 87,251	$ 85,121