Other Noninterest Expense (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Other Income and Expenses [Abstract]
Outside processing	$ 38,151,000	$ 20,574,000	$ 20,473,000
Loan and lease expense	31,216,000	13,649,000	22,149,000
Advertising and marketing	28,220,000	28,120,000	26,927,000
Professional fees	26,863,000	21,529,000	33,070,000
Card processing and issuance costs	21,235,000	17,461,000	18,325,000
FDIC insurance	18,298,000	15,056,000	16,049,000
CFPB and OCC settlement charge	0	32,000,000	0
Goodwill impairment	0	0	73,041,000
Other	139,733,000	107,097,000	115,712,000
Total other noninterest expense	$ 303,716,000	$ 255,486,000	$ 325,746,000