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Loans and Allowance for Credit Losses - Aging Analysis of Past Due Loans (Parenthetical) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Accounts Notes And Loans Receivable [Line Items]    
Loans held for sale $ 24,398 $ 29,367
Residential Mortgage Loans [Member]    
Accounts Notes And Loans Receivable [Line Items]    
Loans held for sale $ 24,398 $ 29,367