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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 | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Acquired Loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | $ 4,284 |  | $ 2,376 |  |
Impaired Financing Receivable, Interest Income, Accrual Method | 7 |  | 7 |  |
Related allowance | 164 |  | 164 |  | $ 16
Recorded investment | 4,498 |  | 4,498 |  | 587
Unpaid principal balance | 5,707 |  | 5,707 |  | 661
Acquired Loans [Member] | Commercial Loan [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 164 |  | 82 |  |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 |  | 0 |  |
Related allowance | 110 |  | 110 |  | 0
Recorded investment | 490 |  | 490 |  | 0
Unpaid principal balance | 490 |  | 490 |  | 0
Acquired Loans [Member] | Commercial Financial Agricultural And Other With No Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 72 |  | 36 |  |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 |  | 0 |  |
Recorded investment | 72 |  | 72 |  | 0
Unpaid principal balance | 72 |  | 72 |  | 0
Acquired Loans [Member] | Real Estate Construction With No Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 100 |  | 50 |  |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 |  | 0 |  |
Recorded investment | 0 |  | 0 |  | 0
Unpaid principal balance | 0 |  | 0 |  | 0
Acquired Loans [Member] | Residential Real Estate With No Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 623 |  | 465 |  |
Impaired Financing Receivable, Interest Income, Accrual Method | 7 |  | 7 |  |
Recorded investment | 624 |  | 624 |  | 406
Unpaid principal balance | 943 |  | 943 |  | 480
Acquired Loans [Member] | Commercial Real Estate With No Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 3,151 |  | 1,575 |  |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 |  | 0 |  |
Recorded investment | 3,140 |  | 3,140 |  | 162
Unpaid principal balance | 4,012 |  | 4,012 |  | 162
Acquired Loans [Member] | Loans To Individuals With No 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 |  |
Recorded investment | 0 |  | 0 |  | 3
Unpaid principal balance | 0 |  | 0 |  | 3
Acquired Loans [Member] | With No Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 3,946 |  | 2,126 |  |
Impaired Financing Receivable, Interest Income, Accrual Method | 7 |  | 7 |  |
Recorded investment | 3,836 |  | 3,836 |  | 571
Unpaid principal balance | 5,027 |  | 5,027 |  | 645
Acquired 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 |  | 0
Recorded investment | 0 |  | 0 |  | 0
Unpaid principal balance | 0 |  | 0 |  | 0
Acquired Loans [Member] | Residential Real Estate With Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 14 |  | 7 |  |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 |  | 0 |  |
Related allowance | 4 |  | 4 |  | 16
Recorded investment | 14 |  | 14 |  | 16
Unpaid principal balance | 28 |  | 28 |  | 16
Acquired Loans [Member] | Commercial Real Estate With Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 160 |  | 161 |  |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 |  | 0 |  |
Related allowance | 50 |  | 50 |  | 0
Recorded investment | 158 |  | 158 |  | 0
Unpaid principal balance | 162 |  | 162 |  | 0
Acquired 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 |  | 0
Recorded investment | 0 |  | 0 |  | 0
Unpaid principal balance | 0 |  | 0 |  | 0
Acquired Loans [Member] | With Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 338 |  | 250 |  |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 |  | 0 |  |
Related allowance | 164 |  | 164 |  | 16
Recorded investment | 662 |  | 662 |  | 16
Unpaid principal balance | 680 |  | 680 |  | 16
Originated Loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 40,488 | $ 61,934 | 42,232 | $ 58,082 |
Impaired Financing Receivable, Interest Income, Accrual Method | 430 | 287 | 632 | 602 |
Related allowance | 1,971 |  | 1,971 |  | 3,128
Recorded investment | 35,687 |  | 35,687 |  | 41,226
Unpaid principal balance | 49,146 |  | 49,146 |  | 56,296
Originated Loans [Member] | Commercial Loan [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 8,813 | 22,788 | 9,220 | 17,939 |
Impaired Financing Receivable, Interest Income, Accrual Method | 20 | 65 | 46 | 91 |
Related allowance | 1,681 |  | 1,681 |  | 2,530
Recorded investment | 8,634 |  | 8,634 |  | 13,423
Unpaid principal balance | 12,699 |  | 12,699 |  | 19,226
Originated Loans [Member] | Commercial Financial Agricultural And Other With No Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 12,583 | 18,995 | 13,888 | 20,116 |
Impaired Financing Receivable, Interest Income, Accrual Method | 251 | 95 | 289 | 249 |
Recorded investment | 8,290 |  | 8,290 |  | 9,549
Unpaid principal balance | 14,697 |  | 14,697 |  | 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 | 0 | 0 | 9 |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 | 0 | 0 | 44 |
Recorded investment | 0 |  | 0 |  | 0
Unpaid principal balance | 0 |  | 0 |  | 0
Originated Loans [Member] | Residential Real Estate With No Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 11,339 | 11,462 | 11,434 | 11,232 |
Impaired Financing Receivable, Interest Income, Accrual Method | 110 | 90 | 185 | 137 |
Recorded investment | 11,128 |  | 11,128 |  | 10,873
Unpaid principal balance | 12,975 |  | 12,975 |  | 13,004
Originated Loans [Member] | Commercial Real Estate With No Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 6,596 | 6,887 | 6,586 | 7,136 |
Impaired Financing Receivable, Interest Income, Accrual Method | 34 | 29 | 88 | 67 |
Recorded investment | 6,524 |  | 6,524 |  | 5,765
Unpaid principal balance | 7,498 |  | 7,498 |  | 6,905
Originated Loans [Member] | Loans To Individuals With No Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 344 | 405 | 341 | 442 |
Impaired Financing Receivable, Interest Income, Accrual Method | 9 | 2 | 11 | 3 |
Recorded investment | 341 |  | 341 |  | 382
Unpaid principal balance | 391 |  | 391 |  | 507
Originated Loans [Member] | With No Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 30,862 | 37,749 | 32,249 | 38,935 |
Impaired Financing Receivable, Interest Income, Accrual Method | 404 | 216 | 573 | 500 |
Recorded investment | 26,283 |  | 26,283 |  | 26,569
Unpaid principal balance | 35,561 |  | 35,561 |  | 35,785
Originated Loans [Member] | Real Estate Construction With Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 0 | 0 | 0 | 0 |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 | 0 | 0 | 0 |
Related allowance | 0 |  | 0 |  | 0
Recorded investment | 0 |  | 0 |  | 0
Unpaid principal balance | 0 |  | 0 |  | 0
Originated Loans [Member] | Residential Real Estate With Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 332 | 476 | 279 | 347 |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 | 0 | 0 | 0 |
Related allowance | 31 |  | 31 |  | 164
Recorded investment | 342 |  | 342 |  | 424
Unpaid principal balance | 459 |  | 459 |  | 475
Originated Loans [Member] | Commercial Real Estate With Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 481 | 921 | 484 | 861 |
Impaired Financing Receivable, Interest Income, Accrual Method | 6 | 6 | 13 | 11 |
Related allowance | 259 |  | 259 |  | 434
Recorded investment | 428 |  | 428 |  | 810
Unpaid principal balance | 427 |  | 427 |  | 810
Originated Loans [Member] | Loans To Individuals With Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 0 | 0 | 0 | 0 |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 | 0 | 0 | 0 |
Related allowance | 0 |  | 0 |  | 0
Recorded investment | 0 |  | 0 |  | 0
Unpaid principal balance | 0 |  | 0 |  | 0
Originated Loans [Member] | With Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 9,626 | 24,185 | 9,983 | 19,147 |
Impaired Financing Receivable, Interest Income, Accrual Method | 26 | $ 71 | 59 | $ 102 |
Related allowance | 1,971 |  | 1,971 |  | 3,128
Recorded investment | 9,404 |  | 9,404 |  | 14,657
Unpaid principal balance | $ 13,585 |  | $ 13,585 |  | $ 20,511

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