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Commitments and Contingent Liabilities (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
Loss Contingencies [Line Items]  
Concentration Risk, Credit Risk, Financial Instrument, Maximum Exposure $ 2,900
Commitments to Extend Credit  
Loss Contingencies [Line Items]  
Amount of commitment 6,922,000
Commitments to Extend Credit | Home equity  
Loss Contingencies [Line Items]  
Amount of commitment 974,000
Standby Letters of Credit  
Loss Contingencies [Line Items]  
Amount of commitment $ 177,500
Maximum  
Loss Contingencies [Line Items]  
Expiry period of standby letter of credit, maximum 2 years