Commitments and Credit Risk (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Loss Contingencies [Line Items]
Total commitments	$ 1,459,984	$ 1,546,495
Commitments to originate loans
Loss Contingencies [Line Items]
Total commitments	113,439	134,652
Standby letters of credit
Loss Contingencies [Line Items]
Total commitments	38,342	39,035
Lines of credit
Loss Contingencies [Line Items]
Total commitments	1,290,998	1,351,873
Future lease commitments
Loss Contingencies [Line Items]
Total commitments	$ 17,205	$ 20,935