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Loans and Allowance for Loan Losses - Allowance Allocation (Details) - USD ($)
Mar. 31, 2018
Dec. 31, 2017
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Total Allowance for Loan Losses $ 70,204,000 $ 67,240,000
Troubled debt restructurings performing as of restructure date $ 6,100,000 $ 6,600,000