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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 | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Acquired Loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | $ 7,481 | $ 4,585 | $ 5,031 | $ 3,614 |
Impaired Financing Receivable, Interest Income, Accrual Method | 1 | 12 | 24 | 13 |
Related allowance | 19 |  | 19 |  | $ 131
Recorded investment | 8,289 |  | 8,289 |  | 3,292
Unpaid principal balance | 10,153 |  | 10,153 |  | 4,877
Acquired Loans [Member] | Commercial Loan [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 |  | 131
Recorded investment | 0 |  | 0 |  | 131
Unpaid principal balance | 0 |  | 0 |  | 131
Acquired Loans [Member] | Commercial Financial Agricultural And Other With No Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 4,697 | 73 | 2,255 | 261 |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 | 10 | 0 | 10 |
Recorded investment | 4,693 |  | 4,693 |  | 73
Unpaid principal balance | 4,717 |  | 4,717 |  | 73
Acquired 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
Acquired Loans [Member] | Residential Real Estate With No Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 1,950 | 2,541 | 1,966 | 1,779 |
Impaired Financing Receivable, Interest Income, Accrual Method | 1 | 2 | 6 | 3 |
Recorded investment | 1,971 |  | 1,971 |  | 2,031
Unpaid principal balance | 2,413 |  | 2,413 |  | 2,604
Acquired Loans [Member] | Commercial Real Estate With No Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 666 | 1,955 | 636 | 1,558 |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 | 0 | 18 | 0 |
Recorded investment | 1,459 |  | 1,459 |  | 1,042
Unpaid principal balance | 2,843 |  | 2,843 |  | 2,052
Acquired Loans [Member] | Loans To Individuals With No Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 13 | 16 | 14 | 16 |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 | 0 | 0 | 0 |
Recorded investment | 13 |  | 13 |  | 15
Unpaid principal balance | 15 |  | 15 |  | 17
Acquired Loans [Member] | With No Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 7,326 | 4,585 | 4,871 | 3,614 |
Impaired Financing Receivable, Interest Income, Accrual Method | 1 | 12 | 24 | 13 |
Recorded investment | 8,136 |  | 8,136 |  | 3,161
Unpaid principal balance | 9,988 |  | 9,988 |  | 4,746
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 | 0 | 0 | 0 | 0 |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 | 0 | 0 |  |
Related allowance | 0 |  | 0 |  | 0
Recorded investment | 0 |  | 0 |  | 0
Unpaid principal balance | 0 |  | 0 |  | 0
Acquired Loans [Member] | Commercial Real Estate With Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 155 | 0 | 160 | 0 |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 | 0 | 0 | 0 |
Related allowance | 19 |  | 19 |  | 0
Recorded investment | 153 |  | 153 |  | 0
Unpaid principal balance | 165 |  | 165 |  | 0
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 | 155 | 0 | 160 | 0 |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 | 0 | 0 | 0 |
Related allowance | 19 |  | 19 |  | 131
Recorded investment | 153 |  | 153 |  | 131
Unpaid principal balance | 165 |  | 165 |  | 131
Originated Loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 27,987 | 38,659 | 26,858 | 44,729 |
Impaired Financing Receivable, Interest Income, Accrual Method | 131 | 135 | 474 | 949 |
Related allowance | 1,527 |  | 1,527 |  | 1,500
Recorded investment | 27,036 |  | 27,036 |  | 28,735
Unpaid principal balance | 36,530 |  | 36,530 |  | 38,787
Originated Loans [Member] | Commercial Loan [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 4,677 | 10,298 | 4,064 | 5,979 |
Impaired Financing Receivable, Interest Income, Accrual Method | 8 | 4 | 36 | 16 |
Related allowance | 1,054 |  | 1,054 |  | 797
Recorded investment | 4,644 |  | 4,644 |  | 3,042
Unpaid principal balance | 6,386 |  | 6,386 |  | 3,181
Originated Loans [Member] | Commercial Financial Agricultural And Other With No Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 1,902 | 5,697 | 2,129 | 17,838 |
Impaired Financing Receivable, Interest Income, Accrual Method | 3 | 8 | 10 | 576 |
Recorded investment | 1,638 |  | 1,638 |  | 8,735
Unpaid principal balance | 7,014 |  | 7,014 |  | 16,442
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 | 10,254 | 10,627 | 10,751 | 10,639 |
Impaired Financing Receivable, Interest Income, Accrual Method | 86 | 59 | 280 | 191 |
Recorded investment | 9,760 |  | 9,760 |  | 10,726
Unpaid principal balance | 11,516 |  | 11,516 |  | 12,571
Originated Loans [Member] | Commercial Real Estate With No Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 3,582 | 6,810 | 3,854 | 7,632 |
Impaired Financing Receivable, Interest Income, Accrual Method | 28 | 59 | 129 | 146 |
Recorded investment | 3,274 |  | 3,274 |  | 3,599
Unpaid principal balance | 3,502 |  | 3,502 |  | 3,812
Originated Loans [Member] | Loans To Individuals With No Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 389 | 320 | 356 | 322 |
Impaired Financing Receivable, Interest Income, Accrual Method | 4 | 2 | 11 | 6 |
Recorded investment | 392 |  | 392 |  | 281
Unpaid principal balance | 593 |  | 593 |  | 408
Originated Loans [Member] | With No Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 16,127 | 23,454 | 17,090 | 36,431 |
Impaired Financing Receivable, Interest Income, Accrual Method | 121 | 128 | 430 | 919 |
Recorded investment | 15,064 |  | 15,064 |  | 23,341
Unpaid principal balance | 22,625 |  | 22,625 |  | 33,233
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 | 740 | 565 | 347 | 532 |
Impaired Financing Receivable, Interest Income, Accrual Method | 1 | 2 | 6 | 11 |
Related allowance | 4 |  | 4 |  | 107
Recorded investment | 920 |  | 920 |  | 486
Unpaid principal balance | 976 |  | 976 |  | 495
Originated Loans [Member] | Commercial Real Estate With Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 6,443 | 4,342 | 5,357 | 1,787 |
Impaired Financing Receivable, Interest Income, Accrual Method | 1 | 1 | 2 | 3 |
Related allowance | 469 |  | 469 |  | 596
Recorded investment | 6,408 |  | 6,408 |  | 1,866
Unpaid principal balance | 6,543 |  | 6,543 |  | 1,878
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 | 11,860 | 15,205 | 9,768 | 8,298 |
Impaired Financing Receivable, Interest Income, Accrual Method | 10 | $ 7 | 44 | $ 30 |
Related allowance | 1,527 |  | 1,527 |  | 1,500
Recorded investment | 11,972 |  | 11,972 |  | 5,394
Unpaid principal balance | $ 13,905 |  | $ 13,905 |  | $ 5,554

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