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Credit Quality and Allowance for Loan Losses - Allowance for Loan Losses and Recorded Investment in Loans (Parenthetical) (Detail) - USD ($) $ in Millions | Sep. 30, 2017 | Dec. 31, 2016
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GS Financial Corp [Member] | Britton & Koontz [Member] | Acquired Loans [Member] | ASC 310-30 [Member] |  |
Financing Receivable, Allowance for Credit Losses [Line Items] |  |
Acquired loans | $ 9.3 | $ 13.1

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- Definition The recorded balance, net of any applicable reductions (for example, unamortized accretable yield and allowance for loan losses). This relates to loans not accounted for debt securities with evidence of deterioration of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82894903&loc=d3e15032-111544 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 30 -Section 15 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82894507&loc=d3e13503-111538 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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