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Borrowed Funds - Subordinated Debt (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Dec. 28, 2017
Jun. 30, 2014
Mar. 31, 2007
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Subordinated Debt            
Balance at end of period       $ 33,524,000   $ 33,524,000
Interest expense on borrowed funds       558,000 $ 551,000  
Subordinated Debt            
Subordinated Debt            
Balance at end of period       33,524,000   33,524,000
Average balance during the period       33,524,000   33,524,000
Maximum month-end balance       $ 33,524,000   $ 33,524,000
Weighted-average rate during the year       6.66%   6.69%
Weighted-average rate at end of period       6.77%   6.70%
Interest expense on borrowed funds       $ 558,000 $ 551,000  
Subordinated Debt | Subordinated Debentures            
Subordinated Debt            
Face amount of debt issued     $ 4,000,000      
Subordinated Debt | Subordinated Debentures | LIBOR            
Subordinated Debt            
Variable rate basis spread     1.62%      
Subordinated Debt | Convertible Subordinated Promissory Notes Due 2024            
Subordinated Debt            
Face amount of debt issued   $ 29,400,000        
Debt instrument, increment amounts   100,000        
Debt instrument, minimum investment amount   $ 1,000,000        
Term of debt instrument   10 years        
Debt instrument, maximum interest rate after fifth anniversary   9.00%        
Debt instrument, minimum period from issuance that principal may be prepaid   5 years        
Debt instrument, threshold consecutive trading days for conversion after first, second, third, fourth, and fifth anniversaries of the issuance   30 days        
Debt instrument, conversion price (in dollars per share) $ 16          
Debt instrument, notice period of intent to prepay 20 days          
Debt instrument, issuance threshold amount requiring consent of holders $ 15,000,000          
Debt instrument, redemption price percentage 100.00%          
Debt instrument, required period before redemption 5 years          
Subordinated Debt | Convertible Subordinated Promissory Notes Due 2024 | LIBOR            
Subordinated Debt            
Debt instrument, basis spread on variable rate after fifth anniversary   5.00%        
Subordinated Debt | Convertible Subordinated Promissory Notes Due 2024 | Debtholder Investments Less Than Three Million Dollars            
Subordinated Debt            
Debt instrument, investment amount of holder   $ 3,000,000        
Debt instrument, minimum ownership of common stock as percentage of principal acquired   30.00%        
Interest rate on debt security   7.00%        
Subordinated Debt | Convertible Subordinated Promissory Notes Due 2024 | Debtholder Investments Of Three Million Dollars Or Greater            
Subordinated Debt            
Debt instrument, investment amount of holder   $ 3,000,000        
Debt instrument, minimum ownership of common stock as percentage of principal acquired   30.00%        
Interest rate on debt security   7.50%        
Subordinated Debt | Convertible Subordinated Promissory Notes Due 2024 | Debtholder Investments Of Ten Million Dollars Or Greater            
Subordinated Debt            
Debt instrument, investment amount of holder   $ 10,000,000        
Interest rate on debt security   7.00%