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Loans and Allowance for Loan Losses - Allowance Allocation (Details) - USD ($)
Sep. 30, 2019
Dec. 31, 2018
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Allowance for Loan Losses $ 93,647,000 $ 83,575,000
Troubled debt restructurings performing as of restructure date 5,800,000 5,900,000
Troubled Debt Restructurings    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Allowance for Loan Losses $ 0 $ 0