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Short and Long-Term Borrowings - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Mar. 31, 2020
Dec. 31, 2019
Debt Instrument      
Short-term borrowings   $ 75,000,000 $ 0
Trust preferred securities qualify as Tier1 capital   $ 29,500,000 $ 29,400,000
FHLB advances      
Debt Instrument      
FHLB weighted average interest rate   1.11% 1.57%
Subordinated notes      
Debt Instrument      
Aggregate amount of subordinated notes $ 12,000,000    
Note term 10 years    
Interest rate 5.00%    
FHLB advances      
Debt Instrument      
Short-term borrowings   $ 75,000,000  
FHLB interest rate   0.61%