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Borrowed Funds - Subordinated Debt (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2014
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Mar. 31, 2007
Subordinated Debt              
Balance at end of period   $ 33,524,000   $ 33,524,000   $ 33,524,000  
Interest expense on borrowed funds   559,000 $ 556,000 1,664,000 $ 1,648,000    
Subordinated Debt              
Subordinated Debt              
Balance at end of period   $ 33,524,000   33,524,000   33,524,000  
Average balance       33,524,000   33,524,000  
Maximum month-end balance       $ 33,524,000   $ 33,524,000  
Weighted-average rate       6.59%   6.55%  
Rate at end of period   6.61%   6.61%   6.57%  
Interest expense on borrowed funds       $ 1,700,000 $ 1,600,000    
Subordinated Debt | Subordinated Debentures              
Subordinated Debt              
Face amount of debt issued             $ 4,000,000
Debt instrument interest rate description       three month LIBOR Rate      
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, face amount of incremental issue 100,000            
Debt instrument, minimal investment required $ 1,000,000            
Term of debt instrument 10 years            
Debt instrument, maximum interest rate after fifth anniversary   9.00%   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   $ 16      
Debt instrument, notice period of intent to prepay       20 days      
Debt instrument, issuance threshold amount requiring consent of holders   $ 15,000,000   $ 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   $ 3,000,000      
Debt instrument, minimum ownership of common stock as percentage of principal acquired   30.00%   30.00%      
Interest rate on debt security   7.00%   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   $ 3,000,000      
Debt instrument, minimum ownership of common stock as percentage of principal acquired   30.00%   30.00%      
Interest rate on debt security   7.50%   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   $ 10,000,000      
Interest rate on debt security   7.00%   7.00%