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Loans and the Allowance for Loan Losses (Details) - Loans receivable on nonaccrual status - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]    
Financing Receivable, Recorded Investment, Nonaccrual Status $ 51,855 $ 65,613
Commercial Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Financing Receivable, Recorded Investment, Nonaccrual Status 29,340 47,363
Commercial Real Estate Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Financing Receivable, Recorded Investment, Nonaccrual Status 15,135 12,757
Construction Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Financing Receivable, Recorded Investment, Nonaccrual Status 2,934
Residential Portfolio Segment [Member]    
Financing Receivable, Impaired [Line Items]    
Financing Receivable, Recorded Investment, Nonaccrual Status $ 4,446 $ 5,493