Summary of Significant Accounting Policies - Narrative (Details) - USD ($) |
12 Months Ended | |
|---|---|---|
Dec. 31, 2015 |
Dec. 31, 2014 |
|
| Accounting Policies [Abstract] | ||
| Federal reserve bank minimum reserve required | $ 434,000 | $ 171,000 |
| Number of days delinquent at which accrual of interest on loan is discontinued | 90 days | |
| Federal home loan bank stock, par value (usd per share) | $ 100 |