Real Estate Owned (Details) - USD ($) $ in Thousands |
3 Months Ended | |||
|---|---|---|---|---|
Mar. 31, 2018 |
Mar. 31, 2017 |
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| Real Estate [Line Items] | ||||
| Real estate owned, net | $ 3,374 | $ 5,070 | $ 4,558 | $ 6,118 |
| Transferred from loans receivable | 238 | 416 | ||
| Sales | (1,165) | (1,009) | ||
| Write downs | (257) | (455) | ||
| Other | 0 | $ 0 | ||
| Mortgage loans in process of foreclosure | 2,100 | 2,300 | ||
| One-to-Four Family [Member] | ||||
| Real Estate [Line Items] | ||||
| Real estate owned, net | 1,062 | 1,330 | ||
| Multi Family [Member] | ||||
| Real Estate [Line Items] | ||||
| Real estate owned, net | 0 | 0 | ||
| Construction and Land [Member] | ||||
| Real Estate [Line Items] | ||||
| Real estate owned, net | 3,663 | 4,582 | ||
| Commercial Real Estate [Member] | ||||
| Real Estate [Line Items] | ||||
| Real estate owned, net | 300 | 300 | ||
| Real Estate Owned Prior To Valuation Allowance [Member] | ||||
| Real Estate [Line Items] | ||||
| Real estate owned, net | 5,025 | 6,212 | ||
| Valuation Allowance, Real Estate Owned [Member] | ||||
| Real Estate [Line Items] | ||||
| Valuation allowance at end of period | $ (1,651) | $ (1,654) | ||