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Loans and Allowance for Credit Losses - Credit Risk Profile by Creditworthiness (Detail) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Originated Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | $ 5,866,396 | $ 5,714,373
Originated Loans [Member] | Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 5,759,478 | 5,624,757
Originated Loans [Member] | Special Mention [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 26,018 | 43,393
Originated Loans [Member] | Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 80,900 | 46,223
Originated Loans [Member] | Doubtful [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Originated Loans [Member] | Criticized [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 106,918 | 89,616
Originated Loans [Member] | Commercial, financial, agricultural and other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 1,242,909 | 1,212,026
Originated Loans [Member] | Commercial, financial, agricultural and other [Member] | Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 1,183,879 | 1,171,363
Originated Loans [Member] | Commercial, financial, agricultural and other [Member] | Special Mention [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 21,674 | 29,359
Originated Loans [Member] | Commercial, financial, agricultural and other [Member] | Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 37,356 | 11,304
Originated Loans [Member] | Commercial, financial, agricultural and other [Member] | Doubtful [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Originated Loans [Member] | Commercial, financial, agricultural and other [Member] | Criticized [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 59,030 | 40,663
Originated Loans [Member] | Real estate construction [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 408,234 | 442,777
Originated Loans [Member] | Real estate construction [Member] | Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 408,210 | 442,751
Originated Loans [Member] | Real estate construction [Member] | Special Mention [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 24 | 26
Originated Loans [Member] | Real estate construction [Member] | Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Originated Loans [Member] | Real estate construction [Member] | Doubtful [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Originated Loans [Member] | Real estate construction [Member] | Criticized [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 24 | 26
Originated Loans [Member] | Residential real estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 1,439,306 | 1,415,808
Originated Loans [Member] | Residential real estate [Member] | Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 1,431,760 | 1,406,845
Originated Loans [Member] | Residential real estate [Member] | Special Mention [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 466 | 475
Originated Loans [Member] | Residential real estate [Member] | Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 7,080 | 8,488
Originated Loans [Member] | Residential real estate [Member] | Doubtful [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Originated Loans [Member] | Residential real estate [Member] | Criticized [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 7,546 | 8,963
Originated Loans [Member] | Commercial Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 2,041,339 | 1,958,346
Originated Loans [Member] | Commercial Real Estate [Member] | Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 2,001,296 | 1,918,690
Originated Loans [Member] | Commercial Real Estate [Member] | Special Mention [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 3,847 | 13,533
Originated Loans [Member] | Commercial Real Estate [Member] | Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 36,196 | 26,123
Originated Loans [Member] | Commercial Real Estate [Member] | Doubtful [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Originated Loans [Member] | Commercial Real Estate [Member] | Criticized [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 40,043 | 39,656
Originated Loans [Member] | Loans to individuals [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 734,608 | 685,416
Originated Loans [Member] | Loans to individuals [Member] | Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 734,333 | 685,108
Originated Loans [Member] | Loans to individuals [Member] | Special Mention [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 7 | 0
Originated Loans [Member] | Loans to individuals [Member] | Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 268 | 308
Originated Loans [Member] | Loans to individuals [Member] | Doubtful [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Originated Loans [Member] | Loans to individuals [Member] | Criticized [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 275 | 308
Acquired Loans [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 447,548 | 474,775
Acquired Loans [Member] | Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 436,931 | 463,784
Acquired Loans [Member] | Special Mention [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 1,284 | 5,183
Acquired Loans [Member] | Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 9,333 | 5,808
Acquired Loans [Member] | Doubtful [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Acquired Loans [Member] | Criticized [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 10,617 | 10,991
Acquired Loans [Member] | Commercial, financial, agricultural and other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 29,331 | 29,827
Acquired Loans [Member] | Commercial, financial, agricultural and other [Member] | Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 27,330 | 27,696
Acquired Loans [Member] | Commercial, financial, agricultural and other [Member] | Special Mention [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 211 | 2,009
Acquired Loans [Member] | Commercial, financial, agricultural and other [Member] | Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 1,790 | 122
Acquired Loans [Member] | Commercial, financial, agricultural and other [Member] | Doubtful [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Acquired Loans [Member] | Commercial, financial, agricultural and other [Member] | Criticized [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 2,001 | 2,131
Acquired Loans [Member] | Real estate construction [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 5,224 | 6,262
Acquired Loans [Member] | Real estate construction [Member] | Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 4,679 | 5,697
Acquired Loans [Member] | Real estate construction [Member] | Special Mention [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 545 | 565
Acquired Loans [Member] | Real estate construction [Member] | Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Acquired Loans [Member] | Real estate construction [Member] | Doubtful [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Acquired Loans [Member] | Real estate construction [Member] | Criticized [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 545 | 565
Acquired Loans [Member] | Residential real estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 251,834 | 265,554
Acquired Loans [Member] | Residential real estate [Member] | Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 249,022 | 262,630
Acquired Loans [Member] | Residential real estate [Member] | Special Mention [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 528 | 537
Acquired Loans [Member] | Residential real estate [Member] | Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 2,284 | 2,387
Acquired Loans [Member] | Residential real estate [Member] | Doubtful [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Acquired Loans [Member] | Residential real estate [Member] | Criticized [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 2,812 | 2,924
Acquired Loans [Member] | Commercial Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 148,759 | 159,173
Acquired Loans [Member] | Commercial Real Estate [Member] | Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 143,512 | 153,814
Acquired Loans [Member] | Commercial Real Estate [Member] | Special Mention [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 2,072
Acquired Loans [Member] | Commercial Real Estate [Member] | Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 5,247 | 3,287
Acquired Loans [Member] | Commercial Real Estate [Member] | Doubtful [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Acquired Loans [Member] | Commercial Real Estate [Member] | Criticized [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 5,247 | 5,359
Acquired Loans [Member] | Loans to individuals [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 12,400 | 13,959
Acquired Loans [Member] | Loans to individuals [Member] | Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 12,388 | 13,947
Acquired Loans [Member] | Loans to individuals [Member] | Special Mention [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Acquired Loans [Member] | Loans to individuals [Member] | Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 12 | 12
Acquired Loans [Member] | Loans to individuals [Member] | Doubtful [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Acquired Loans [Member] | Loans to individuals [Member] | Criticized [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | $ 12 | $ 12

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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=121593590&loc=d3e4428-111522 + Details
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