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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, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Acquired Loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | $ 4,034 | $ 4,284 | $ 3,129 | $ 2,376 |
Impaired Financing Receivable, Interest Income, Accrual Method | 1 | 7 | 1 | 7 |
Related allowance | 61 |  | 61 |  | $ 33
Recorded investment | 4,750 |  | 4,750 |  | 2,289
Unpaid principal balance | 6,252 |  | 6,252 |  | 3,545
Acquired Loans [Member] | Commercial Loan [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 0 | 164 | 0 | 82 |
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
Acquired Loans [Member] | Commercial Financial Agricultural And Other With No Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 299 | 72 | 355 | 36 |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 | 0 | 0 | 0 |
Recorded investment | 73 |  | 73 |  | 436
Unpaid principal balance | 73 |  | 73 |  | 449
Acquired Loans [Member] | Real Estate Construction With No Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 0 | 100 | 0 | 50 |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 | 0 | 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 | 1,962 | 623 | 1,366 | 465 |
Impaired Financing Receivable, Interest Income, Accrual Method | 1 | 7 | 1 | 7 |
Recorded investment | 2,534 |  | 2,534 |  | 666
Unpaid principal balance | 3,056 |  | 3,056 |  | 965
Acquired Loans [Member] | Commercial Real Estate With No Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 1,692 | 3,151 | 1,359 | 1,575 |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 | 0 | 0 | 0 |
Recorded investment | 2,030 |  | 2,030 |  | 940
Unpaid principal balance | 2,994 |  | 2,994 |  | 1,842
Acquired Loans [Member] | Loans To Individuals With No Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 16 | 0 | 17 | 0 |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 | 0 | 0 | 0 |
Recorded investment | 16 |  | 16 |  | 17
Unpaid principal balance | 17 |  | 17 |  | 17
Acquired Loans [Member] | With No Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 3,969 | 3,946 | 3,097 | 2,126 |
Impaired Financing Receivable, Interest Income, Accrual Method | 1 | 7 | 1 | 7 |
Recorded investment | 4,653 |  | 4,653 |  | 2,059
Unpaid principal balance | 6,140 |  | 6,140 |  | 3,273
Acquired 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
Acquired Loans [Member] | Residential Real Estate With Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 65 | 14 | 32 | 7 |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 | 0 | 0 | 0 |
Related allowance | 61 |  | 61 |  | 4
Recorded investment | 97 |  | 97 |  | 93
Unpaid principal balance | 112 |  | 112 |  | 122
Acquired Loans [Member] | Commercial Real Estate With Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 0 | 160 | 0 | 161 |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 | 0 | 0 | 0 |
Related allowance | 0 |  | 0 |  | 29
Recorded investment | 0 |  | 0 |  | 137
Unpaid principal balance | 0 |  | 0 |  | 150
Acquired 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
Acquired Loans [Member] | With Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 65 | 338 | 32 | 250 |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 | 0 | 0 | 0 |
Related allowance | 61 |  | 61 |  | 33
Recorded investment | 97 |  | 97 |  | 230
Unpaid principal balance | 112 |  | 112 |  | 272
Originated Loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 50,748 | 40,488 | 47,764 | 42,232 |
Impaired Financing Receivable, Interest Income, Accrual Method | 633 | 430 | 807 | 632 |
Related allowance | 7,540 |  | 7,540 |  | 3,713
Recorded investment | 41,113 |  | 41,113 |  | 39,951
Unpaid principal balance | 50,880 |  | 50,880 |  | 53,021
Originated Loans [Member] | Commercial Loan [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 22,812 | 8,813 | 19,694 | 9,220 |
Impaired Financing Receivable, Interest Income, Accrual Method | 23 | 20 | 52 | 46 |
Related allowance | 6,597 |  | 6,597 |  | 3,478
Recorded investment | 19,537 |  | 19,537 |  | 16,866
Unpaid principal balance | 19,889 |  | 19,889 |  | 21,094
Originated Loans [Member] | Commercial Financial Agricultural And Other With No Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 6,793 | 12,583 | 8,034 | 13,888 |
Impaired Financing Receivable, Interest Income, Accrual Method | 481 | 251 | 528 | 289 |
Recorded investment | 1,932 |  | 1,932 |  | 5,548
Unpaid principal balance | 6,769 |  | 6,769 |  | 12,153
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 | 0 |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 | 0 | 0 | 0 |
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 | 10,334 | 11,339 | 10,316 | 11,434 |
Impaired Financing Receivable, Interest Income, Accrual Method | 64 | 110 | 125 | 185 |
Recorded investment | 10,347 |  | 10,347 |  | 10,625
Unpaid principal balance | 12,174 |  | 12,174 |  | 12,470
Originated Loans [Member] | Commercial Real Estate With No Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 6,086 | 6,596 | 6,076 | 6,586 |
Impaired Financing Receivable, Interest Income, Accrual Method | 23 | 34 | 54 | 88 |
Recorded investment | 4,463 |  | 4,463 |  | 5,155
Unpaid principal balance | 7,073 |  | 7,073 |  | 5,489
Originated Loans [Member] | Loans To Individuals With No Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 292 | 344 | 322 | 341 |
Impaired Financing Receivable, Interest Income, Accrual Method | 3 | 9 | 4 | 11 |
Recorded investment | 253 |  | 253 |  | 347
Unpaid principal balance | 292 |  | 292 |  | 383
Originated Loans [Member] | With No Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 23,505 | 30,862 | 24,748 | 32,249 |
Impaired Financing Receivable, Interest Income, Accrual Method | 571 | 404 | 711 | 573 |
Recorded investment | 16,995 |  | 16,995 |  | 21,675
Unpaid principal balance | 26,308 |  | 26,308 |  | 30,495
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 | 880 | 332 | 845 | 279 |
Impaired Financing Receivable, Interest Income, Accrual Method | 5 | 0 | 9 | 0 |
Related allowance | 281 |  | 281 |  | 107
Recorded investment | 877 |  | 877 |  | 456
Unpaid principal balance | 948 |  | 948 |  | 478
Originated Loans [Member] | Commercial Real Estate With Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 3,551 | 481 | 2,477 | 484 |
Impaired Financing Receivable, Interest Income, Accrual Method | 34 | 6 | 35 | 13 |
Related allowance | 662 |  | 662 |  | 128
Recorded investment | 3,704 |  | 3,704 |  | 954
Unpaid principal balance | 3,735 |  | 3,735 |  | 954
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 | 27,243 | 9,626 | 23,016 | 9,983 |
Impaired Financing Receivable, Interest Income, Accrual Method | 62 | $ 26 | 96 | $ 59 |
Related allowance | 7,540 |  | 7,540 |  | 3,713
Recorded investment | 24,118 |  | 24,118 |  | 18,276
Unpaid principal balance | $ 24,572 |  | $ 24,572 |  | $ 22,526

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