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Loans and Allowance for Credit Losses - Credit Risk Profile by Creditworthiness (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Originated Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross $ 5,550,399 $ 5,275,296
Originated Loans [Member] | Pass [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 5,447,310 5,160,953
Originated Loans [Member] | Special Mention [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 64,023 79,294
Originated Loans [Member] | Substandard [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 39,066 35,049
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 103,089 114,343
Originated Loans [Member] | Commercial, financial, agricultural and other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 1,201,705 1,100,947
Originated Loans [Member] | Commercial, financial, agricultural and other [Member] | Pass [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 1,154,497 1,055,394
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 40,460 33,723
Originated Loans [Member] | Commercial, financial, agricultural and other [Member] | Substandard [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 6,748 11,830
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 47,208 45,553
Originated Loans [Member] | Real estate construction [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 435,385 353,008
Originated Loans [Member] | Real estate construction [Member] | Pass [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 435,356 337,367
Originated Loans [Member] | Real estate construction [Member] | Special Mention [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 29 15,641
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 29 15,641
Originated Loans [Member] | Residential real estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 1,350,765 1,313,645
Originated Loans [Member] | Residential real estate [Member] | Pass [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 1,340,786 1,302,912
Originated Loans [Member] | Residential real estate [Member] | Special Mention [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 684 1,026
Originated Loans [Member] | Residential real estate [Member] | Substandard [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 9,295 9,707
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 9,979 10,733
Originated Loans [Member] | Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 1,939,608 1,922,349
Originated Loans [Member] | Commercial Real Estate [Member] | Pass [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 1,893,994 1,880,139
Originated Loans [Member] | Commercial Real Estate [Member] | Special Mention [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 22,850 28,904
Originated Loans [Member] | Commercial Real Estate [Member] | Substandard [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 22,764 13,306
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 45,614 42,210
Originated Loans [Member] | Loans to individuals [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 622,936 585,347
Originated Loans [Member] | Loans to individuals [Member] | Pass [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 622,677 585,141
Originated Loans [Member] | Loans to individuals [Member] | Special Mention [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 0 0
Originated Loans [Member] | Loans to individuals [Member] | Substandard [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 259 206
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 259 206
Acquired Loans [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 452,660 498,843
Acquired Loans [Member] | Pass [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 437,773 485,951
Acquired Loans [Member] | Special Mention [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 3,978 7,700
Acquired Loans [Member] | Substandard [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 10,909 5,192
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 14,887 12,892
Acquired Loans [Member] | Commercial, financial, agricultural and other [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 34,719 37,526
Acquired Loans [Member] | Commercial, financial, agricultural and other [Member] | Pass [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 29,199 31,399
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 762 5,890
Acquired Loans [Member] | Commercial, financial, agricultural and other [Member] | Substandard [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 4,758 237
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 5,520 6,127
Acquired Loans [Member] | Real estate construction [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 6,469 5,970
Acquired Loans [Member] | Real estate construction [Member] | Pass [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 5,864 5,337
Acquired Loans [Member] | Real estate construction [Member] | Special Mention [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 605 633
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 605 633
Acquired Loans [Member] | Residential real estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 228,676 248,760
Acquired Loans [Member] | Residential real estate [Member] | Pass [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 226,003 245,637
Acquired Loans [Member] | Residential real estate [Member] | Special Mention [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 647 736
Acquired Loans [Member] | Residential real estate [Member] | Substandard [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 2,026 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 2,673 3,123
Acquired Loans [Member] | Commercial Real Estate [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 178,974 201,195
Acquired Loans [Member] | Commercial Real Estate [Member] | Pass [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 172,898 198,201
Acquired Loans [Member] | Commercial Real Estate [Member] | Special Mention [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 1,964 441
Acquired Loans [Member] | Commercial Real Estate [Member] | Substandard [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 4,112 2,553
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 6,076 2,994
Acquired Loans [Member] | Loans to individuals [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 3,822 5,392
Acquired Loans [Member] | Loans to individuals [Member] | Pass [Member]    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and Leases Receivable, Gross 3,809 5,377
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 13 15
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 $ 13 $ 15