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Commitments and Contingent Liabilities (Details) - USD ($)
6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Loss Contingencies [Line Items]    
Expiry period of standby letter of credit, maximum 2 years  
Accrual for inherent risks associated with commitments $ 2,900,000 $ 3,100,000
Commitments    
Loss Contingencies [Line Items]    
Amount of commitment 6,320,000,000  
Home Equity Line of Credit [Member]    
Loss Contingencies [Line Items]    
Amount of commitment 926,792,000  
Standby letter of credit    
Loss Contingencies [Line Items]    
Amount of commitment $ 175,900,000