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Loans and the Allowance for Loan Losses, Acquired Loans (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Dec. 31, 2018
Certain Loans Acquired in Transfer Accounted for as Debt Securities [Abstract]    
Outstanding principal balance $ 29,254 $ 31,940
Carrying amount 28,864 31,497
Carrying amount 84 91
ASC 310-30 [Member]    
Certain Loans Acquired in Transfer Accounted for as Debt Securities [Abstract]    
Outstanding principal balance 241 246
Carrying amount 84 $ 91
Changes in Accretable Yield on Acquired Impaired Loans [Roll Forward]    
Balance at beginning of period 12  
Accretion (1)  
Balance at end of period $ 11