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Business Combinations - Additional Information (Detail) - Central National Bank & Trust [Member] - USD ($) $ in Millions | Jul. 12, 2016 | Mar. 31, 2016 | Jun. 30, 2016
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Business Acquisition [Line Items] |  |  |
Cash consideration received as special dividend |  | $ 6.7 |
Payments received as cash consideration |  | $ 5.3 |
Reported total assets of acquiree |  |  | $ 56.4
Subsequent Event [Member] |  |  |
Business Acquisition [Line Items] |  |  |
Percentage of cash consideration received as capital in excess of assets | 8.00% |  |
Percentage of cash consideration received from parent as percentage of remaining capital | 120.00% |  |

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