Commitments and Contingent Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Loss Contingencies [Line Items]
Maximum potential obligations to extend credit for loan commitments	$ 1,006,964	$ 980,173
Rate lock agreements	400
Commitments to sell mortgages to unrelated investors on a loan-by-loan basis	4,400
Loan commitments
Loss Contingencies [Line Items]
Maximum potential obligations to extend credit for loan commitments	144,593	149,397
Standby letters of credit
Loss Contingencies [Line Items]
Maximum potential obligations to extend credit for loan commitments	31,441	30,460
Undisbursed portion of lines of credit
Loss Contingencies [Line Items]
Maximum potential obligations to extend credit for loan commitments	$ 830,930	$ 800,316