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Business Combinations - Additional Information (Detail) - Salin Banc shares Inc [Member] - USD ($) $ / shares in Units, $ in Millions | Oct. 29, 2018 | Dec. 31, 2018 | Oct. 26, 2018
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Business Acquisition [Line Items] |  |  |
Total assets |  | $ 929.4 |
Total deposits |  | 749.5 |
Total loans |  | $ 593.7 |
Exchange ratio per share | 23907.50% |  |
Cash paid for each share | $ 84,417.17 |  |
Market closing price per share |  |  | $ 16.95
Estimated transaction value |  |  | $ 135.3

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