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General (Details) - USD ($)
$ in Thousands
Jan. 01, 2020
Sep. 30, 2020
Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
  Loans   $ 9,243,833 $ 8,459,310
Estimated | One-time cumulative-effect adjustment      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Life of loan portfolio 4 years    
Reserve for potential losses from unfunded commitments $ 18,000    
Estimated | One-time cumulative-effect adjustment | Minimum      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Increase in allowance 55.00%    
Estimated | One-time cumulative-effect adjustment | Maximum      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
Increase in allowance 65.00%    
Remaining in deferral      
New Accounting Pronouncements or Change in Accounting Principle [Line Items]      
  Loans   $ 176,000