Subordinated Debentures (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Subordinated Borrowing [Line Items]
Purchase discount on subordinated debt	$ 8,200		$ 8,200
Less: unamortized debt issuance costs	(1,327)		(1,327)		$ (1,115)
Subordinated notes	33,673		33,673		33,885
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	1,327		1,327		1,115
Proceeds utilized			32,800
Subordinated Debt Owed to Trusts	22,200		$ 22,200
Period of callable debentures			5 years
Interest expense on subordinated debentures	1,059	$ 246	$ 3,151	$ 726
Accrued interest payable on subordinated debentures	3,261		3,261		2,387
Subordinated Notes, Fixed to Floating 8.50% pa
Subordinated Borrowing [Line Items]
Subordinated notes	$ 35,000		$ 35,000		$ 35,000
Interest rate					8.50%
Subordinated Notes, Fixed to Floating 8.50% pa | After December 15, 2021
Subordinated Borrowing [Line Items]
Interest rate	6.685%		6.685%
Trust Preferred Securities Subject to Mandatory Redemption [Member]
Subordinated Borrowing [Line Items]
Interest rate spread on variable rate			1.334%
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		$ 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 2, 2007 - maturity - September 15, 2037
Subordinated Borrowing [Line Items]
Trust Preferred Securities Outstanding			$ 16,500
Subordinated Debt Owed to Trusts	$ 17,011		$ 17,011
Patriot Bancshares Capital Trust II - issuance August 2, 2007 - maturity - September 15, 2037 | Maximum
Subordinated Borrowing [Line Items]
Interest rate spread on variable rate			11.90%