Investment Securities - Pledged Securities (Details) - USD ($) $ in Thousands |
Dec. 31, 2018 |
Dec. 31, 2017 |
|---|---|---|
| Amortized Cost | ||
| Assets Sold under Agreements to Repurchase [Line Items] | ||
| Securities pledged | $ 22,745 | $ 21,838 |
| Fair Value | ||
| Assets Sold under Agreements to Repurchase [Line Items] | ||
| Securities pledged | 22,524 | 21,929 |
| Securities sold under agreements to repurchase | Amortized Cost | ||
| Assets Sold under Agreements to Repurchase [Line Items] | ||
| Securities pledged | 16,032 | 14,405 |
| Securities sold under agreements to repurchase | Fair Value | ||
| Assets Sold under Agreements to Repurchase [Line Items] | ||
| Securities pledged | 15,862 | 14,475 |
| Federal Home Loan Bank advances | Amortized Cost | ||
| Assets Sold under Agreements to Repurchase [Line Items] | ||
| Securities pledged | 6,713 | 7,433 |
| Federal Home Loan Bank advances | Fair Value | ||
| Assets Sold under Agreements to Repurchase [Line Items] | ||
| Securities pledged | $ 6,662 | $ 7,454 |