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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, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Acquired Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | $ 3,021 | $ 3,416 |
Impaired Financing Receivable, Interest Income, Accrual Method | 2 | 2 |
Related allowance | 204 |  | $ 0
Recorded investment | 4,178 |  | 2,519
Unpaid principal balance | 4,680 |  | 2,993
Acquired Loans [Member] | Commercial Loan [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
Acquired Loans [Member] | Commercial Financial Agricultural And Other With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 74 | 439 |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 | 0 |
Recorded investment | 74 |  | 73
Unpaid principal balance | 74 |  | 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 |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 | 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 | 2,090 | 1,981 |
Impaired Financing Receivable, Interest Income, Accrual Method | 2 | 1 |
Recorded investment | 2,000 |  | 2,136
Unpaid principal balance | 2,468 |  | 2,585
Acquired Loans [Member] | Commercial Real Estate With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 229 | 982 |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 | 1 |
Recorded investment | 245 |  | 298
Unpaid principal balance | 261 |  | 320
Acquired Loans [Member] | Loans To Individuals With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 12 | 14 |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 | 0 |
Recorded investment | 12 |  | 12
Unpaid principal balance | 15 |  | 15
Acquired Loans [Member] | With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 2,405 | 3,416 |
Impaired Financing Receivable, Interest Income, Accrual Method | 2 | 2 |
Recorded investment | 2,331 |  | 2,519
Unpaid principal balance | 2,818 |  | 2,993
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
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 | 0 | 0 |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 | 0 |
Related allowance | 0 |  | 0
Recorded investment | 0 |  | 0
Unpaid principal balance | 0 |  | 0
Acquired Loans [Member] | Commercial Real Estate With Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 616 | 0 |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 | 0 |
Related allowance | 204 |  | 0
Recorded investment | 1,847 |  | 0
Unpaid principal balance | 1,862 |  | 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
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 | 616 | 0 |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 | 0 |
Related allowance | 204 |  | 0
Recorded investment | 1,847 |  | 0
Unpaid principal balance | 1,862 |  | 0
Originated Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 37,262 | 24,773 |
Impaired Financing Receivable, Interest Income, Accrual Method | 126 | 131 |
Related allowance | 9,595 |  | 2,432
Recorded investment | 54,962 |  | 29,698
Unpaid principal balance | 65,626 |  | 39,122
Originated Loans [Member] | Commercial Loan [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 7,838 | 3,068 |
Impaired Financing Receivable, Interest Income, Accrual Method | 18 | 3 |
Related allowance | 2,727 |  | 1,580
Recorded investment | 7,469 |  | 8,290
Unpaid principal balance | 14,780 |  | 10,032
Originated Loans [Member] | Commercial Financial Agricultural And Other With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 925 | 2,707 |
Impaired Financing Receivable, Interest Income, Accrual Method | 4 | 13 |
Recorded investment | 958 |  | 1,848
Unpaid principal balance | 1,143 |  | 6,997
Originated Loans [Member] | Real Estate Construction 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
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 | 10,529 | 10,798 |
Impaired Financing Receivable, Interest Income, Accrual Method | 78 | 72 |
Recorded investment | 9,909 |  | 10,372
Unpaid principal balance | 12,056 |  | 12,437
Originated Loans [Member] | Commercial Real Estate With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 4,086 | 3,994 |
Impaired Financing Receivable, Interest Income, Accrual Method | 22 | 36 |
Recorded investment | 4,447 |  | 3,015
Unpaid principal balance | 4,965 |  | 3,210
Originated Loans [Member] | Loans To Individuals With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 445 | 324 |
Impaired Financing Receivable, Interest Income, Accrual Method | 3 | 1 |
Recorded investment | 473 |  | 406
Unpaid principal balance | 840 |  | 640
Originated Loans [Member] | With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 15,985 | 17,823 |
Impaired Financing Receivable, Interest Income, Accrual Method | 107 | 122 |
Recorded investment | 15,787 |  | 15,641
Unpaid principal balance | 19,004 |  | 23,284
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 | 325 | 604 |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 | 5 |
Related allowance | 0 |  | 1
Recorded investment | 255 |  | 474
Unpaid principal balance | 358 |  | 498
Originated Loans [Member] | Commercial Real Estate With Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 13,114 | 3,278 |
Impaired Financing Receivable, Interest Income, Accrual Method | 1 | 1 |
Related allowance | 6,868 |  | 851
Recorded investment | 31,451 |  | 5,293
Unpaid principal balance | 31,484 |  | 5,308
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 | 21,277 | 6,950 |
Impaired Financing Receivable, Interest Income, Accrual Method | 19 | $ 9 |
Related allowance | 9,595 |  | 2,432
Recorded investment | 39,175 |  | 14,057
Unpaid principal balance | $ 46,622 |  | $ 15,838

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