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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, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Acquired Loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | $ 4,197 | $ 4,034 | $ 3,806 | $ 3,129 |
Impaired Financing Receivable, Interest Income, Accrual Method | 21 | 1 | 23 | 1 |
Related allowance | 25 |  | 25 |  | $ 131
Recorded investment | 7,080 |  | 7,080 |  | 3,292
Unpaid principal balance | 7,572 |  | 7,572 |  | 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 | 1,630 | 299 | 1,035 | 355 |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 | 0 | 0 | 0 |
Recorded investment | 4,718 |  | 4,718 |  | 73
Unpaid principal balance | 4,718 |  | 4,718 |  | 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 | 1,969 | 1,962 | 1,975 | 1,366 |
Impaired Financing Receivable, Interest Income, Accrual Method | 4 | 1 | 5 | 1 |
Recorded investment | 1,939 |  | 1,939 |  | 2,031
Unpaid principal balance | 2,391 |  | 2,391 |  | 2,604
Acquired Loans [Member] | Commercial Real Estate With No Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 423 | 1,692 | 620 | 1,359 |
Impaired Financing Receivable, Interest Income, Accrual Method | 17 | 0 | 18 | 0 |
Recorded investment | 251 |  | 251 |  | 1,042
Unpaid principal balance | 276 |  | 276 |  | 2,052
Acquired Loans [Member] | Loans To Individuals With No Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 14 | 16 | 14 | 17 |
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 | 4,036 | 3,969 | 3,644 | 3,097 |
Impaired Financing Receivable, Interest Income, Accrual Method | 21 | 1 | 23 | 1 |
Recorded investment | 6,921 |  | 6,921 |  | 3,161
Unpaid principal balance | 7,400 |  | 7,400 |  | 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 | 65 | 0 | 32 |
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 Real Estate With Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 161 | 0 | 162 | 0 |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 | 0 | 0 | 0 |
Related allowance | 25 |  | 25 |  | 0
Recorded investment | 159 |  | 159 |  | 0
Unpaid principal balance | 172 |  | 172 |  | 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 | 161 | 65 | 162 | 32 |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 | 0 | 0 | 0 |
Related allowance | 25 |  | 25 |  | 131
Recorded investment | 159 |  | 159 |  | 131
Unpaid principal balance | 172 |  | 172 |  | 131
Originated Loans [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 27,815 | 50,748 | 26,294 | 47,764 |
Impaired Financing Receivable, Interest Income, Accrual Method | 214 | 633 | 345 | 807 |
Related allowance | 2,505 |  | 2,505 |  | 1,500
Recorded investment | 28,474 |  | 28,474 |  | 28,735
Unpaid principal balance | 37,371 |  | 37,371 |  | 38,787
Originated Loans [Member] | Commercial Loan [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 3,957 | 22,812 | 3,784 | 19,694 |
Impaired Financing Receivable, Interest Income, Accrual Method | 16 | 23 | 30 | 52 |
Related allowance | 1,330 |  | 1,330 |  | 797
Recorded investment | 4,195 |  | 4,195 |  | 3,042
Unpaid principal balance | 5,886 |  | 5,886 |  | 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 | 2,268 | 6,793 | 2,216 | 8,034 |
Impaired Financing Receivable, Interest Income, Accrual Method | 5 | 481 | 7 | 528 |
Recorded investment | 2,767 |  | 2,767 |  | 8,735
Unpaid principal balance | 7,828 |  | 7,828 |  | 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 | 10,242 | 10,334 | 10,577 | 10,316 |
Impaired Financing Receivable, Interest Income, Accrual Method | 115 | 64 | 186 | 125 |
Recorded investment | 10,092 |  | 10,092 |  | 10,726
Unpaid principal balance | 11,735 |  | 11,735 |  | 12,571
Originated Loans [Member] | Commercial Real Estate With No Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 3,034 | 6,086 | 3,256 | 6,076 |
Impaired Financing Receivable, Interest Income, Accrual Method | 65 | 23 | 101 | 54 |
Recorded investment | 3,042 |  | 3,042 |  | 3,599
Unpaid principal balance | 3,265 |  | 3,265 |  | 3,812
Originated Loans [Member] | Loans To Individuals With No Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 357 | 292 | 340 | 322 |
Impaired Financing Receivable, Interest Income, Accrual Method | 5 | 3 | 7 | 4 |
Recorded investment | 361 |  | 361 |  | 281
Unpaid principal balance | 550 |  | 550 |  | 408
Originated Loans [Member] | With No Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 15,901 | 23,505 | 16,389 | 24,748 |
Impaired Financing Receivable, Interest Income, Accrual Method | 190 | 571 | 301 | 711 |
Recorded investment | 16,262 |  | 16,262 |  | 23,341
Unpaid principal balance | 23,378 |  | 23,378 |  | 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 | 653 | 880 | 571 | 845 |
Impaired Financing Receivable, Interest Income, Accrual Method | 7 | 5 | 12 | 9 |
Related allowance | 87 |  | 87 |  | 107
Recorded investment | 761 |  | 761 |  | 486
Unpaid principal balance | 760 |  | 760 |  | 495
Originated Loans [Member] | Commercial Real Estate With Related Allowance [Member] |  |  |  |  |
Financing Receivable, Impaired [Line Items] |  |  |  |  |
Impaired Financing Receivable, Average Recorded Investment | 7,304 | 3,551 | 5,550 | 2,477 |
Impaired Financing Receivable, Interest Income, Accrual Method | 1 | 34 | 2 | 35 |
Related allowance | 1,088 |  | 1,088 |  | 596
Recorded investment | 7,256 |  | 7,256 |  | 1,866
Unpaid principal balance | 7,347 |  | 7,347 |  | 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 | 11,914 | 27,243 | 9,905 | 23,016 |
Impaired Financing Receivable, Interest Income, Accrual Method | 24 | $ 62 | 44 | $ 96 |
Related allowance | 2,505 |  | 2,505 |  | 1,500
Recorded investment | 12,212 |  | 12,212 |  | 5,394
Unpaid principal balance | $ 13,993 |  | $ 13,993 |  | $ 5,554

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