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Commitments and Contingent Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Loss Contingencies [Line Items]    
Maximum potential obligations to extend credit for loan commitments $ 980,173 $ 997,048
Rate lock agreements 1,800  
Commitments to sell mortgages to unrelated investors on a loan-by-loan basis 807  
Loan commitments    
Loss Contingencies [Line Items]    
Maximum potential obligations to extend credit for loan commitments 149,397 156,111
Standby letters of credit    
Loss Contingencies [Line Items]    
Maximum potential obligations to extend credit for loan commitments 30,460 21,685
Undisbursed portion of lines of credit    
Loss Contingencies [Line Items]    
Maximum potential obligations to extend credit for loan commitments $ 800,316 $ 819,252