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Commitments and Contingent Liabilities (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Jan. 01, 2020
Loss Contingencies [Line Items]      
Expiry period of standby letter of credit, maximum 2 years    
Accrual for inherent risks associated with commitments $ 16,300 $ 2,400  
Off-Balance Sheet, Credit Loss, Liability     $ 8,800
Commitments      
Loss Contingencies [Line Items]      
Amount of commitment 8,000,000    
Home Equity Line of Credit      
Loss Contingencies [Line Items]      
Amount of commitment 1,100,000    
Standby letter of credit      
Loss Contingencies [Line Items]      
Amount of commitment $ 200,400