Subordinated Debentures (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Dec. 31, 2016
Subordinated Borrowing [Line Items]
Less: unamortized debt issuance costs	$ (1,408)		$ (1,115)
Subordinated notes	33,592		33,885
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	1,408		1,115
Purchase discount on subordinated debt	8,500
Interest expense on subordinated debentures	1,041	$ 237
Accrued interest payable on subordinated debentures	2,727		2,387
Subordinated Notes, Fixed to Floating 8.50% pa
Subordinated Borrowing [Line Items]
Subordinated notes	$ 35,000		$ 35,000
Trust Preferred Securities Subject to Mandatory Redemption [Member]
Subordinated Borrowing [Line Items]
Interest rate spread on variable rate	1.15%
Patriot Bancshares Capital Trust I - issuance March 31, 2006 - maturity - April 7, 2036
Subordinated Borrowing [Line Items]
Trust Preferred Securities Outstanding	$ 5,000
Subordinated Debt Owed to Trusts	$ 5,155
Patriot Bancshares Capital Trust I - issuance March 31, 2006 - maturity - April 7, 2036 | Maximum
Subordinated Borrowing [Line Items]
Interest rate spread on variable rate	11.90%
Patriot Bancshares Capital Trust II - issuance August 8, 2007 - maturity - September 15, 2037
Subordinated Borrowing [Line Items]
Trust Preferred Securities Outstanding	$ 16,500
Subordinated Debt Owed to Trusts	$ 17,011
Patriot Bancshares Capital Trust II - issuance August 8, 2007 - maturity - September 15, 2037 | Maximum
Subordinated Borrowing [Line Items]
Interest rate spread on variable rate	11.90%