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Summary of Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Millions | Jun. 30, 2019 | Jan. 01, 2019
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Summary Of Significant Accounting Policies [Line Items] |  |
Capitalized right of use asset and lease liabilities to be regcognize upon adoption of ASU | $ 20.0 |
Municipal Debt Securities [Member] | Accounting Standards Update 2017-12 [Member] |  |
Summary Of Significant Accounting Policies [Line Items] |  |
Reclassification of callable held-to-maturity securities |  | $ 67.3

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- Definition Capitalized right of use asset and lease liabilities to be regcognize upon adoption of ASU. + References No definition available. + Details
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- Definition Reclassification of callable held -to- maturity securities + References No definition available. + Details
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- Details
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- Details
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