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Loans and Allowance for Credit Losses - Credit Risk Profile by Creditworthiness (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014
--- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | $ 4,575,735 | $ 4,457,308 | $ 4,411,481
Pass [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | 4,438,816 | 4,317,182 |
OAEM [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | 55,196 | 72,370 |
Substandard [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | 81,723 | 63,595 |
Doubtful [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | 0 | 4,161 |
Criticized [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | 136,919 | 140,126 |
Commercial, financial, agricultural and other [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | 1,126,881 | 1,052,109 |
Commercial, financial, agricultural and other [Member] | Pass [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | 1,043,458 | 983,357 |
Commercial, financial, agricultural and other [Member] | OAEM [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | 22,447 | 32,563 |
Commercial, financial, agricultural and other [Member] | Substandard [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | 60,976 | 32,028 |
Commercial, financial, agricultural and other [Member] | Doubtful [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | 0 | 4,161 |
Commercial, financial, agricultural and other [Member] | Criticized [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | 83,423 | 68,752 |
Real estate construction [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | 179,710 | 120,785 |
Real estate construction [Member] | Pass [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | 179,229 | 112,536 |
Real estate construction [Member] | OAEM [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | 450 | 8,013 |
Real estate construction [Member] | Substandard [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | 31 | 236 |
Real estate construction [Member] | Doubtful [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | 0 | 0 |
Real estate construction [Member] | Criticized [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | 481 | 8,249 |
Residential real estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | 1,204,220 | 1,226,344 |
Residential real estate [Member] | Pass [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | 1,192,888 | 1,214,920 |
Residential real estate [Member] | OAEM [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | 2,926 | 2,315 |
Residential real estate [Member] | Substandard [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | 8,406 | 9,109 |
Residential real estate [Member] | Doubtful [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | 0 | 0 |
Residential real estate [Member] | Criticized [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | 11,332 | 11,424 |
Commercial Real Estate [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | 1,435,954 | 1,405,256 |
Commercial Real Estate [Member] | Pass [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | 1,394,506 | 1,353,773 |
Commercial Real Estate [Member] | OAEM [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | 29,373 | 29,479 |
Commercial Real Estate [Member] | Substandard [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | 12,075 | 22,004 |
Commercial Real Estate [Member] | Doubtful [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | 0 | 0 |
Commercial Real Estate [Member] | Criticized [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | 41,448 | 51,483 |
Loans to individuals [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | 628,970 | 652,814 |
Loans to individuals [Member] | Pass [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | 628,735 | 652,596 |
Loans to individuals [Member] | OAEM [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | 0 | 0 |
Loans to individuals [Member] | Substandard [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | 235 | 218 |
Loans to individuals [Member] | Doubtful [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | 0 | 0 |
Loans to individuals [Member] | Criticized [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Loans and Leases Receivable, Net of Deferred Income | $ 235 | $ 218 |

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