Lease Commitments - Supplemental Balance Sheet and Cash Flow Information Related to Operating Leases (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease right-of-use assets	$ 25,538	$ 26,165
Operating lease liabilities	28,959	30,098
Cash paid for amounts included in the measurement of operating lease liabilities	6,035	5,936
Right-of-use assets obtained in exchange for new operating lease obligations	2,095	1,224
Right-of-use assets obtained through bank acquisition	$ 2,343	$ 0
Weighted average remaining lease term for operating leases	8 years 6 months	8 years 6 months
Weighted average discount rate for operating leases	4.62%	4.70%
Operating Lease, Liability, Statement of Financial Position [Extensible List]	us-gaap:OtherLiabilities	us-gaap:OtherLiabilities