Troubled Debt Restructurings Loans By Class Of Financing Receivable Modified As TDRs (Details) $ in Thousands	3 Months Ended	6 Months Ended		12 Months Ended
	Jun. 30, 2017 USD ($) contract	Jun. 30, 2018 contract	Jun. 30, 2017 USD ($) contract	Dec. 31, 2017 contract
Troubled Debt Restructuring, Subsequent Periods [Line Items]
Number of contracts		20		21
Troubled Debt Restructurings Within Previous Twelve Months [Member]
Troubled Debt Restructuring, Subsequent Periods [Line Items]
Number of contracts	1		1
Recorded Investment \| $	$ 236		$ 236
Residential Single Family \| Troubled Debt Restructurings Within Previous Twelve Months [Member]
Troubled Debt Restructuring, Subsequent Periods [Line Items]
Number of contracts	1		1
Recorded Investment \| $	$ 236		$ 236