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Securities - Additional Information (Details) $ in Thousands | Mar. 31, 2019 USD ($) security | Dec. 31, 2018 USD ($) security | Mar. 31, 2018 USD ($) | Jan. 01, 2018 USD ($)
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Debt Securities, Available-for-sale [Line Items] |  |  |  |
Number of debt securities in unrealized loss position | security | 54 | 65 |  |
Securities pledged for regulatory and legal requirements | $ 214,100 | $ 236,000 |  |
ASU No. 2016-01 | Retained Earnings |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Reclassification of net unrealized gains on equity securities |  |  | $ 862 | $ 900
ASU No. 2016-01 | AOCI Attributable to Parent |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Reclassification of net unrealized gains on equity securities |  |  | $ (862) | $ (900)

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