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Securities - Additional Information (Details) $ in Thousands | Jun. 30, 2018 USD ($) security | Jan. 01, 2018 USD ($) | Dec. 31, 2017 USD ($) security
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Debt Securities, Available-for-sale [Line Items] |  |  |  |
Number of debt securities in unrealized loss position | security | 73 |  | 51 |
Securities pledged for regulatory and legal requirements | $ 231,000 |  | $ 249,000 |
ASU No. 2016-01 | AOCI |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Reclassification of net unrealized gains on equity securities (from) AOCI to Retained Earnings |  | $ (900) | (862) | [1]
ASU No. 2016-01 | Retained Earnings |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Reclassification of net unrealized gains on equity securities (from) AOCI to Retained Earnings |  | $ 900 | $ 862 | [1]
[1] | Reclassification due to the adoption of ASU No. 2016-01.

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