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Borrowed Funds - Subordinated Debt (Details) - USD ($)
1 Months Ended 3 Months Ended 12 Months Ended
Jun. 30, 2014
Mar. 31, 2007
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Subordinated Debt          
Balance at end of period     $ 33,524,000   $ 33,524,000
Interest expense on borrowed funds     551,000 $ 552,000  
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     6.57%   6.64%
Weighted-average rate at end of period     6.64%   6.63%
Interest expense on borrowed funds     $ 600,000 $ 600,000  
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%