Other Real Estate Owned (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Real Estate Properties [Line Items]
Mortgage Loans in Process of Foreclosure, Amount	$ 22,000	$ 26,900
Total
Beginning balance	51,097	61,231
Additions	24,997	34,980
Sales	(28,128)	(40,709)
Write-downs	(4,390)	(4,460)
Ending balance	48,030	51,097
Guaranty Bank
Total
Additions		55
HomeBancorp
Total
Additions	2,135
Palmetto Heritage Bancshares
Total
Additions	2,319
Mortgage
Total
Beginning balance	19,800
Ending balance	$ 17,200	$ 19,800