Other Real Estate Owned (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Dec. 31, 2017
Real Estate Properties [Line Items]
Mortgage Loans in Process of Foreclosure, Amount	$ 25,300		$ 26,900
Total
Beginning balance	51,097	$ 61,231
Additions	11,868	21,891
Sales	(15,769)	(20,236)
Write-downs	(2,698)	(2,160)
Ending balance	46,633	60,781
Mortgage
Total
Beginning balance	19,800
Ending balance	15,100
HomeBancorp Inc.
Total
Additions	$ 2,135
Guaranty Bank
Total
Additions		$ 55