Premises, Equipment, and Leases - Lease Expense and Other Information (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2019 USD ($)
Lease cost
Operating lease cost	$ 24,797
Finance lease cost:
Amortization of right-of-use assets	114
Interest on lease liabilities	135
Short-term lease cost	98
Sublease income	(366)
Total lease cost	24,778
Other information
(Gain)/loss on right-of-use asset impairment-Operating leases	2,551
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	23,053
Operating cash flows from finance leases	135
Finance Lease, Principal Payments	142
Right-of-use assets obtained in exchange for new lease obligations:
Operating leases	47,735
Finance leases	$ 1,475