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Short and Long-Term Borrowings-Narrative (Details) - USD ($)
3 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2015
Dec. 31, 2018
Debt Instrument      
Trust preferred securities qualify as Tier1 capital $ 29,300,000   $ 28,900,000
Aggregate amount of subordinated notes $ 38,249,000    
FHLB advances      
Debt Instrument      
FHLB weighted average interest rate 1.95%   1.72%
Repayment of puttable FHLB advance $ 20,000,000    
Subordinated notes      
Debt Instrument      
Aggregate amount of subordinated notes   $ 12,000,000  
Note term   10 years  
Stated interest rate   5.00%