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Business Combinations - Additional Information (Detail) - Salin Bancshares, Inc [Member] - USD ($) $ / shares in Units, $ in Millions | Oct. 29, 2018 | Oct. 26, 2018 | Sep. 30, 2018
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Business Acquisition [Line Items] |  |  |
Total assets |  |  | $ 918.4
Total deposits |  |  | 752.1
Total loans |  |  | $ 595.7
Subsequent Event [Member] |  |  |
Business Acquisition [Line Items] |  |  |
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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