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Loans and Allowance for Credit Losses - Recorded Investment and Unpaid Principal Balance for Impaired Loans with Associated Allowance (Detail) - USD ($) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Commercial Financial Agricultural And Other With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Related allowance |  |  |
Real Estate Construction With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Related allowance |  |  |
Residential Real Estate With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Related allowance |  |  |
Commercial Real Estate With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Related allowance |  |  |
Loans To Individuals With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Related allowance |  |  |
With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Related allowance |  |  |
Acquired Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 468 |  |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 |  |
Related allowance | 29 |  | 16
Recorded investment | 473 |  | 587
Unpaid principal balance | 548 |  | 661
Acquired Loans [Member] | Commercial Financial Agricultural And Other With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 0 |  |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 |  |
Recorded investment | 0 |  | 0
Unpaid principal balance | 0 |  | 0
Acquired Loans [Member] | Real Estate Construction With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 0 |  |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 |  |
Recorded investment | 0 |  | 0
Unpaid principal balance | 0 |  | 0
Acquired Loans [Member] | Residential Real Estate With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 241 |  |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 |  |
Recorded investment | 246 |  | 406
Unpaid principal balance | 321 |  | 480
Acquired Loans [Member] | Commercial Real Estate With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 162 |  |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 |  |
Recorded investment | 162 |  | 162
Unpaid principal balance | 162 |  | 162
Acquired Loans [Member] | Loans To Individuals With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 0 |  |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 |  |
Recorded investment | 0 |  | 3
Unpaid principal balance | 0 |  | 3
Acquired Loans [Member] | With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 403 |  |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 |  |
Recorded investment | 408 |  | 571
Unpaid principal balance | 483 |  | 645
Acquired Loans [Member] | Commercial Financial Agricultural And Other With Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 0 |  |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 |  |
Related allowance | 0 |  | 0
Recorded investment | 0 |  | 0
Unpaid principal balance | 0 |  | 0
Acquired Loans [Member] | Real Estate Construction With Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 0 |  |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 |  |
Related allowance | 0 |  | 0
Recorded investment | 0 |  | 0
Unpaid principal balance | 0 |  | 0
Acquired Loans [Member] | Residential Real Estate With Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 65 |  |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 |  |
Related allowance | 29 |  | 16
Recorded investment | 65 |  | 16
Unpaid principal balance | 65 |  | 16
Acquired Loans [Member] | Commercial Real Estate With Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 0 |  |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 |  |
Related allowance | 0 |  | 0
Recorded investment | 0 |  | 0
Unpaid principal balance | 0 |  | 0
Acquired Loans [Member] | Loans To Individuals With Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 0 |  |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 |  |
Related allowance | 0 |  | 0
Recorded investment | 0 |  | 0
Unpaid principal balance | 0 |  | 0
Acquired Loans [Member] | With Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 65 |  |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 |  |
Related allowance | 29 |  | 16
Recorded investment | 65 |  | 16
Unpaid principal balance | 65 |  | 16
Originated Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 43,975 | $ 54,230 |
Impaired Financing Receivable, Interest Income, Accrual Method | 202 | 315 |
Related allowance | 2,988 |  | 3,128
Recorded investment | 45,796 |  | 41,226
Unpaid principal balance | 62,389 |  | 56,296
Originated Loans [Member] | Commercial Financial Agricultural And Other With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 12,034 | 17,298 |
Impaired Financing Receivable, Interest Income, Accrual Method | 38 | 152 |
Recorded investment | 12,780 |  | 9,549
Unpaid principal balance | 20,043 |  | 15,369
Originated Loans [Member] | Real Estate Construction With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 0 | 17 |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 | 44 |
Recorded investment | 0 |  | 0
Unpaid principal balance | 0 |  | 0
Originated Loans [Member] | Residential Real Estate With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 11,422 | 10,724 |
Impaired Financing Receivable, Interest Income, Accrual Method | 74 | 47 |
Recorded investment | 11,227 |  | 10,873
Unpaid principal balance | 13,237 |  | 13,004
Originated Loans [Member] | Commercial Real Estate With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 5,949 | 7,658 |
Impaired Financing Receivable, Interest Income, Accrual Method | 54 | 38 |
Recorded investment | 6,028 |  | 5,765
Unpaid principal balance | 7,037 |  | 6,905
Originated Loans [Member] | Loans To Individuals With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 338 | 480 |
Impaired Financing Receivable, Interest Income, Accrual Method | 2 | 1 |
Recorded investment | 365 |  | 382
Unpaid principal balance | 429 |  | 507
Originated Loans [Member] | With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 29,743 | 36,177 |
Impaired Financing Receivable, Interest Income, Accrual Method | 168 | 282 |
Recorded investment | 30,400 |  | 26,569
Unpaid principal balance | 40,746 |  | 35,785
Originated Loans [Member] | Commercial Financial Agricultural And Other With Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 12,787 | 17,027 |
Impaired Financing Receivable, Interest Income, Accrual Method | 26 | 28 |
Related allowance | 2,466 |  | 2,530
Recorded investment | 13,929 |  | 13,423
Unpaid principal balance | 20,124 |  | 19,226
Originated Loans [Member] | Real Estate Construction With Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 0 | 0 |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 | 0 |
Related allowance | 0 |  | 0
Recorded investment | 0 |  | 0
Unpaid principal balance | 0 |  | 0
Originated Loans [Member] | Residential Real Estate With Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 334 | 497 |
Impaired Financing Receivable, Interest Income, Accrual Method | 1 | 0 |
Related allowance | 146 |  | 164
Recorded investment | 366 |  | 424
Unpaid principal balance | 418 |  | 475
Originated Loans [Member] | Commercial Real Estate With Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 1,111 | 529 |
Impaired Financing Receivable, Interest Income, Accrual Method | 7 | 5 |
Related allowance | 376 |  | 434
Recorded investment | 1,101 |  | 810
Unpaid principal balance | 1,101 |  | 810
Originated Loans [Member] | Loans To Individuals With Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 0 | 0 |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 | 0 |
Related allowance | 0 |  | 0
Recorded investment | 0 |  | 0
Unpaid principal balance | 0 |  | 0
Originated Loans [Member] | With Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 14,232 | 18,053 |
Impaired Financing Receivable, Interest Income, Accrual Method | 34 | $ 33 |
Related allowance | 2,988 |  | 3,128
Recorded investment | 15,396 |  | 14,657
Unpaid principal balance | $ 21,643 |  | $ 20,511

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