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Borrowed Funds - Subordinated Debt (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2014
Mar. 31, 2007
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Subordinated Debt              
Balance at end of period     $ 33,524,000   $ 33,524,000   $ 33,524,000
Interest expense on borrowed funds     565,000 $ 559,000 1,674,000 $ 1,664,000  
Subordinated Debt              
Subordinated Debt              
Balance at end of period     $ 33,524,000   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         6.74%   6.64%
Weighted-average rate at end of period     6.67%   6.67%   6.63%
Interest expense on borrowed funds         $ 1,700,000 $ 1,700,000  
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%