Premises and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Property, Plant and Equipment [Abstract]
Depreciation and amortization expense	$ 4,200	$ 3,100	$ 3,100
Lease liabilities	18,000	16,400
Right-of-use assets	$ 16,159	$ 15,137
Lease term for operating leases	6 years	7 years 2 months 12 days
Weighted average discount rate	2.90%	3.00%
Lease costs	$ 4,300	$ 3,100