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Credit Quality and Allowance for Loan Losses - Additional Information (Detail) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2017 USD ($) TDRs | Dec. 31, 2016 USD ($)
Financing Receivable, Impaired [Line Items] |  |
Financing receivable, recorded investment, 90 days past due and still accruing | $ 0 | $ 0
Maximum period of non-covered loans past due and accruing | 90 days | 90 days
Performing TDR not defaulted subsequent to restructuring or to the date financial statements available | TDRs | 0 |
Troubled debt restructuring performed | $ 0 |
GS Financial Corp [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Date of acquisition | Jul. 15, 2011 |
Britton & Koontz Capital Corporation [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Date of acquisition | Feb. 14, 2014 |
Louisiana Bancorp, Inc [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Date of acquisition | Sep. 15, 2015 |

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