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Loans - Troubled Debt Restructurings (Details)
3 Months Ended
Mar. 31, 2019
USD ($)
loan
Mar. 31, 2018
USD ($)
loan
Loans    
Number of Loans | loan 0 0
TDR payment default period 12 months  
Period determining when a past due TDR becomes a subsequent default 90 days  
Recorded Investment, TDR payment defaults | $ $ 0 $ 0