Right-Of-Use Lease Assets and Lease Liabilities - Lease Expense and Supplemental Information (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Leases [Abstract]
Right-of-use lease assets	$ 27,835	$ 31,348
Lease liabilities	$ 27,897	$ 31,433
Weighted average remaining lease term	7 years 3 months	6 years 6 months 18 days
Weighted average discount rate	2.89%	3.09%
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Premises and equipment	Premises and equipment
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List]	Accrued interest and other liabilities	Accrued interest and other liabilities