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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, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Acquired Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | $ 3,416 | $ 2,224 |
Impaired Financing Receivable, Interest Income, Accrual Method | 2 | 1 |
Related allowance | 0 |  | $ 131
Recorded investment | 2,998 |  | 3,292
Unpaid principal balance | 4,447 |  | 4,877
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 |  | 131
Recorded investment | 0 |  | 131
Unpaid principal balance | 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 | 439 | 411 |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 | 0 |
Recorded investment | 100 |  | 73
Unpaid principal balance | 100 |  | 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 | 1,981 | 678 |
Impaired Financing Receivable, Interest Income, Accrual Method | 1 | 1 |
Recorded investment | 1,937 |  | 2,031
Unpaid principal balance | 2,369 |  | 2,604
Acquired Loans [Member] | Commercial Real Estate With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 982 | 907 |
Impaired Financing Receivable, Interest Income, Accrual Method | 1 | 0 |
Recorded investment | 947 |  | 1,042
Unpaid principal balance | 1,962 |  | 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 | 17 |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 | 0 |
Recorded investment | 14 |  | 15
Unpaid principal balance | 16 |  | 17
Acquired Loans [Member] | With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 3,416 | 2,013 |
Impaired Financing Receivable, Interest Income, Accrual Method | 2 | 1 |
Recorded investment | 2,998 |  | 3,161
Unpaid principal balance | 4,447 |  | 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 |
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 | 93 |
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 | 0 | 118 |
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] | 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 | 0 | 211 |
Impaired Financing Receivable, Interest Income, Accrual Method | 0 | 0 |
Related allowance | 0 |  | 131
Recorded investment | 0 |  | 131
Unpaid principal balance | 0 |  | 131
Originated Loans [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 24,773 | 44,781 |
Impaired Financing Receivable, Interest Income, Accrual Method | 131 | 173 |
Related allowance | 2,045 |  | 1,500
Recorded investment | 28,282 |  | 28,735
Unpaid principal balance | 37,163 |  | 38,787
Originated Loans [Member] | Commercial Loan [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 3,068 | 17,720 |
Impaired Financing Receivable, Interest Income, Accrual Method | 3 | 66 |
Related allowance | 1,012 |  | 797
Recorded investment | 3,317 |  | 3,042
Unpaid principal balance | 3,479 |  | 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 | 2,707 | 8,130 |
Impaired Financing Receivable, Interest Income, Accrual Method | 13 | 10 |
Recorded investment | 2,599 |  | 8,735
Unpaid principal balance | 9,100 |  | 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 |
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 | 10,798 | 10,401 |
Impaired Financing Receivable, Interest Income, Accrual Method | 72 | 63 |
Recorded investment | 10,545 |  | 10,726
Unpaid principal balance | 12,264 |  | 12,571
Originated Loans [Member] | Commercial Real Estate With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 3,994 | 5,510 |
Impaired Financing Receivable, Interest Income, Accrual Method | 36 | 31 |
Recorded investment | 3,752 |  | 3,599
Unpaid principal balance | 4,042 |  | 3,812
Originated Loans [Member] | Loans To Individuals With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 324 | 354 |
Impaired Financing Receivable, Interest Income, Accrual Method | 1 | 2 |
Recorded investment | 339 |  | 281
Unpaid principal balance | 530 |  | 408
Originated Loans [Member] | With No Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 17,823 | 24,395 |
Impaired Financing Receivable, Interest Income, Accrual Method | 122 | 106 |
Recorded investment | 17,235 |  | 23,341
Unpaid principal balance | 25,936 |  | 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 |
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 | 604 | 706 |
Impaired Financing Receivable, Interest Income, Accrual Method | 5 | 0 |
Related allowance | 119 |  | 107
Recorded investment | 713 |  | 486
Unpaid principal balance | 713 |  | 495
Originated Loans [Member] | Commercial Real Estate With Related Allowance [Member] |  |  |
Financing Receivable, Impaired [Line Items] |  |  |
Impaired Financing Receivable, Average Recorded Investment | 3,278 | 1,960 |
Impaired Financing Receivable, Interest Income, Accrual Method | 1 | 1 |
Related allowance | 914 |  | 596
Recorded investment | 7,017 |  | 1,866
Unpaid principal balance | 7,035 |  | 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 |
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 | 6,950 | 20,386 |
Impaired Financing Receivable, Interest Income, Accrual Method | 9 | $ 67 |
Related allowance | 2,045 |  | 1,500
Recorded investment | 11,047 |  | 5,394
Unpaid principal balance | $ 11,227 |  | $ 5,554

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