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Commitments and Contingent Liabilities (Details) - USD ($)
$ in Millions
6 Months Ended 12 Months Ended
Jun. 30, 2019
Dec. 31, 2018
Loss Contingencies [Line Items]    
Expiry period of standby letter of credit, maximum 2 years  
Accrual for inherent risks associated with commitments $ 2.4 $ 2.9
Commitments    
Loss Contingencies [Line Items]    
Amount of commitment 7,600.0  
Home Equity Line of Credit    
Loss Contingencies [Line Items]    
Amount of commitment 1,000.0  
Standby letter of credit    
Loss Contingencies [Line Items]    
Amount of commitment $ 198.9