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Loans and Allowance for Credit Losses - Troubled Debt Restructurings Identified During Period (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 USD ($) Contract | Sep. 30, 2015 USD ($) Contract | Sep. 30, 2016 USD ($) Contract | Sep. 30, 2015 USD ($) Contract
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | Contract | 17 | 11 | 57 | 37
Total Pre-Modification Outstanding Recorded Investment | $ 4,463 | $ 1,016 | $ 12,186 | $ 4,217
Post- Modification Outstanding Recorded Investment | $ 4,424 | $ 996 | $ 11,262 | $ 3,963
Financing Receivable, Modifications, Determination of Allowance for Credit Losses | 1612000 | 0 | 1680000 | 52000
Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | Contract | 1 | 1 | 5 | 4
Total Pre-Modification Outstanding Recorded Investment | $ 3,853 | $ 543 | $ 7,955 | $ 2,403
Post- Modification Outstanding Recorded Investment | $ 3,853 | $ 525 | $ 7,281 | $ 2,314
Financing Receivable, Modifications, Determination of Allowance for Credit Losses | 1612 | 0 | 1612 | 52
Residential real estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | Contract | 11 | 8 | 35 | 24
Total Pre-Modification Outstanding Recorded Investment | $ 473 | $ 455 | $ 2,762 | $ 1,254
Post- Modification Outstanding Recorded Investment | $ 441 | $ 455 | $ 2,620 | $ 1,165
Financing Receivable, Modifications, Determination of Allowance for Credit Losses | 0 | 0 | 0 | 0
Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | Contract | 1 |  | 7 | 1
Total Pre-Modification Outstanding Recorded Investment | $ 85 |  | $ 1,373 | $ 464
Post- Modification Outstanding Recorded Investment | $ 85 |  | $ 1,285 | $ 407
Financing Receivable, Modifications, Determination of Allowance for Credit Losses | 0 |  | 68 | 0
Loans to individuals [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Number of Contracts | Contract | 4 | 2 | 10 | 8
Total Pre-Modification Outstanding Recorded Investment | $ 52 | $ 18 | $ 96 | $ 96
Post- Modification Outstanding Recorded Investment | $ 45 | $ 16 | $ 76 | $ 77
Financing Receivable, Modifications, Determination of Allowance for Credit Losses | 0 | 0 | 0 | 0
Extended Maturity [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | $ 85 | $ 0 | $ 1,441 | $ 1,751
Extended Maturity [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 0 | 93 | 1,751
Extended Maturity [Member] | Residential real estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 0
Extended Maturity [Member] | Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 85 |  | 1,348 | 0
Extended Maturity [Member] | Loans to individuals [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 0 | 0 | 0
Contractual Interest Rate Reduction [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 142 | 0 | 4,294 | 357
Contractual Interest Rate Reduction [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 | 0 | 4,009 | 0
Contractual Interest Rate Reduction [Member] | Residential real estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 100 | 0 | 214 | 296
Contractual Interest Rate Reduction [Member] | Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 |  | 0 | 0
Contractual Interest Rate Reduction [Member] | Loans to individuals [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 42 | 0 | 71 | 61
Contractual Payment Modification [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 4,236 | 1,016 | 6,451 | 2,109
Contractual Payment Modification [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 3,853 | 543 | 3,853 | 652
Contractual Payment Modification [Member] | Residential real estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 373 | 455 | 2,548 | 958
Contractual Payment Modification [Member] | Commercial Real Estate [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | 0 |  | 25 | 464
Contractual Payment Modification [Member] | Loans to individuals [Member] |  |  |  |
Financing Receivable, Modifications [Line Items] |  |  |  |
Total Pre-Modification Outstanding Recorded Investment | $ 10 | $ 18 | $ 25 | $ 35

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- Definition Description of how troubled debt restructurings that occurred during the period are factored into the determination of the allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953676-111524 + Details
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