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Borrowed Funds - Subordinated Debt (Details) - USD ($)
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Mar. 31, 2007
Subordinated Debentures            
Borrowed funds $ 33,524,000   $ 33,524,000   $ 33,524,000  
Interest expense on borrowed funds $ 556,000 $ 544,000 $ 1,648,000 $ 589,000    
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%