Accumulated Other Comprehensive Income (Loss) - Additional Information (Detail) - USD ($) $ in Thousands |
12 Months Ended | ||
|---|---|---|---|
Dec. 31, 2018 |
Dec. 31, 2017 |
Dec. 31, 2016 |
|
| Accumulated Other Comprehensive Income [Line Items] | |||
| Other Comprehensive Income (Loss), Securities, Available-for-sale, Adjustment, after Tax | $ 17 | ||
| Adjustments to accumulated other comprehensive income, tax | 546 | ||
| Net (loss) gain on sales of securities | (341) | $ 1,748 | $ 46 |
| Net unrealized gains (losses) recognized in earnings resulting from the redemption of investment securities | (413) | 1,300 | 314 |
| Unrealized Gains and Losses on Available-for-Sale Securities | |||
| Accumulated Other Comprehensive Income [Line Items] | |||
| Adjustments to accumulated other comprehensive income, before tax | 529 | ||
| Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains and Losses on Available-for-Sale Securities | |||
| Accumulated Other Comprehensive Income [Line Items] | |||
| Net (loss) gain on sales of securities | $ 87 | $ 1,700 | $ 46 |
| X | ||||||||||
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
|
| X | ||||||||||
- Definition Amount of unrealized and realized gain (loss) on investment in debt and equity securities. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount after tax, before reclassification adjustments, of unrealized holding gain (loss) on available-for-sale securities and unrealized holding gain (loss) related to transfers of securities into the available-for-sale classification and out of the held-to-maturity classification. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount before tax, after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount after tax and reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Definition Amount of tax expense (benefit), after reclassification adjustments, of appreciation (loss) in value of unsold available-for-sale securities. Excludes amounts related to other than temporary impairment (OTTI) loss. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
|
| X | ||||||||||
- Details
|
| X | ||||||||||
- Details
|