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Loans and Allowance for Loan Losses Loans and Allowance for Loan Losses, Purchased Credit Impaired Loans (Details) - Financial Asset Acquired with Credit Deterioration - USD ($)
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Loans and Allowance for Loan Losses - Purchase Credit Impaired [Line Items]      
Purchased Loans Contractually Required Principal And Interest $ 0 $ 94,312,000 $ 1,359,000
Purchased Loans Cash Flows Expected To Be Collected 0 48,498,000 547,000
Purchased Credit Impaired Loans Acquisition Date Fair Value $ 0 $ 48,302,000 $ 547,000