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Borrowed Funds - Subordinated Debt (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Mar. 31, 2007
Subordinated Debentures            
Balance at end of year $ 33,524,000   $ 33,524,000   $ 33,524,000  
Interest expense on borrowed funds 553,000 $ 549,000 1,105,000 $ 1,092,000    
Subordinated Debt            
Balance at end of year 33,524,000   33,524,000   33,524,000  
Subordinated Debt            
Subordinated Debentures            
Balance at end of year 33,524,000   33,524,000   33,524,000  
Interest expense on borrowed funds         1,100,000  
Subordinated Debt            
Balance at end of year $ 33,524,000   33,524,000   33,524,000  
Average balance during the year     33,524,000   33,524,000  
Maximum month-end balance     $ 33,524,000   $ 33,524,000  
Weighted-average rate during the year     6.57%   6.55%  
Weighted-average rate end of period 6.59%   6.59%   6.57%  
Subordinated Debt | Subordinated Debentures            
Subordinated Debentures            
Face amount of debt issued           $ 4,000,000
Variable rate basis spread (as a percent)     1.62%      
Debt instrument interest rate description     three month LIBOR Rate      
Subordinated Debt | Convertible Subordinated Promissory Notes Due 2024            
Subordinated Debentures            
Face amount of debt issued   29,400,000   29,400,000    
Debt Instrument Face Amount Of Incremental Issue   100,000   100,000    
Debt Instrument Minimum Investment Required   $ 1,000,000   $ 1,000,000    
Term of debt instrument     10 years      
Debt Instrument Period From Issuance That Issuer May Prepay Debt     5 years      
Debt Instrument Convertible Threshold Consecutive Trading Days After First Second Third Fourth And Fifth Anniversaries Of Issuance Or Prepayment Notice     30 days      
Debt Instrument, Convertible, Conversion Price $ 16   $ 16      
Debt Instrument Convertible Notice Period Of Intent To Prepay     20 days      
Debt Instrument Threshold Amount Of New Senior Debt Issuance That Issuer Must Obtain Holder Consent $ 15,000,000   $ 15,000,000      
Debt Instrument, Redemption Price, Percentage     100.00%      
Debt Instrument Redemption Period From Issuance     5 years      
Subordinated Debt | Convertible Subordinated Promissory Notes Due 2024 | LIBOR            
Subordinated Debentures            
Debt Instrument Basis Spread On Variable Rate After Fifth Anniversary     5.00%      
Debt Instrument Maximum Interest Rate Stated Percentage After Fifth Anniversary 9.00%   9.00%      
Subordinated Debt | Convertible Subordinated Promissory Notes Due 2024 | Debtholder Investments Less Than Three Million Dollars [Member]            
Subordinated Debentures            
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 (as a percent) 7.00%   7.00%      
Subordinated Debt | Convertible Subordinated Promissory Notes Due 2024 | Debtholder Investments Of Three Million Dollars Or Greater [Member]            
Subordinated Debentures            
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 (as a percent) 7.50%   7.50%      
Subordinated Debt | Convertible Subordinated Promissory Notes Due 2024 | Debtholder Investments Of Ten Million Dollars Or Greater [Member]            
Subordinated Debentures            
Debt Instrument Investment Amount Of Holder $ 10,000,000   $ 10,000,000      
Interest rate on debt security (as a percent) 7.00%   7.00%