Other Real Estate Owned (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Real Estate Properties [Line Items]
Mortgage Loans in Process of Foreclosure, Amount	$ 30,600		$ 26,900
Total
Beginning balance	51,097	$ 61,231
Additions	6,582	5,822
Sales	(8,380)	(8,845)
Write-downs	(1,210)	(1,717)
Ending balance	48,089	$ 56,491
Mortgage
Total
Beginning balance	19,800
Ending balance	$ 16,500