Subordinated Debentures (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Subordinated Borrowing [Line Items]
Purchase discount on subordinated debt	$ 8,300		$ 8,300
Less: unamortized debt issuance costs	(1,363)		(1,363)		$ (1,115)
Subordinated notes	33,637		33,637		33,885
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net	1,363		1,363		1,115
Proceeds from issuance of subordinated notes, net			32,800
Subordinated Debt Owed to Trusts	22,200		$ 22,200
Period of callable debentures			5 years
Interest expense on subordinated debentures	1,051	$ 243	$ 2,092	$ 480
Accrued interest payable on subordinated debentures	2,203		2,203		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			1.299%
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%