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Subordinated Debentures (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2016
Dec. 31, 2015
Subordinated Borrowing [Line Items]      
Subordinated debentures $ 13,397 $ 13,397 $ 13,187
Purchase discount on subordinated debt 8,800 $ 8,800  
Description of Variable Rate Basis   3 month LIBOR  
Interest expense on subordinated debentures 243 $ 480  
Accrued interest payable on subordinated debentures 2,202 $ 2,202 $ 1,870
Trust Preferred Securities Subject to Mandatory Redemption [Member]      
Subordinated Borrowing [Line Items]      
Interest rate   0.6541%  
Patriot Bancshares Capital Trust I - issuance March 31, 2006 - maturity - April 7, 2036      
Subordinated Borrowing [Line Items]      
Trust preferred securities oustanding   $ 5,000  
Subordinated Debt Owed to Trusts 5,155 $ 5,155  
Patriot Bancshares Capital Trust I - issuance March 31, 2006 - maturity - April 7, 2036 | Maximum      
Subordinated Borrowing [Line Items]      
Interest rate   11.90%  
Patriot Bancshares Capital Trust I - issuance March 31, 2006 - maturity - April 7, 2036 | Minimum      
Subordinated Borrowing [Line Items]      
Interest rate   1.85%  
Patriot Bancshares Capital Trust II - issuance August 8, 2007 - maturity - September 15, 2037      
Subordinated Borrowing [Line Items]      
Trust preferred securities oustanding   $ 16,500  
Subordinated Debt Owed to Trusts $ 17,011 $ 17,011  
Patriot Bancshares Capital Trust II - issuance August 8, 2007 - maturity - September 15, 2037 | Maximum      
Subordinated Borrowing [Line Items]      
Interest rate   11.90%  
Patriot Bancshares Capital Trust II - issuance August 8, 2007 - maturity - September 15, 2037 | Minimum      
Subordinated Borrowing [Line Items]      
Interest rate   1.80%