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Loans and Allowance for Credit Losses - Allowance for Credit Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Sep. 30, 2014 | Sep. 30, 2015 | Dec. 31, 2014 | Sep. 30, 2014
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | $ 45,344 | $ 50,725 | $ 52,051 | $ 54,225 |  |  |
Charge-offs | (2,401) | (2,880) | (14,462) | (14,629) |  |  |
Recoveries | 954 | 866 | 2,111 | 2,567 |  |  |
Provision for Loan, Lease, and Other Losses | 4,621 | 2,073 | 8,818 | 8,621 |  |  |
Ending Balance | 45,344 | 50,725 | 52,051 | 54,225 | $ 48,518 | $ 52,051 | $ 50,784
Ending balance: individually evaluated for impaired |  |  |  |  | 4,255 |  | 4,632
Ending balance: collectively evaluated for impaired |  |  |  |  | 44,263 |  | 46,152
Total |  |  |  |  | 4,575,735 | 4,457,308 | 4,411,481
Ending balance: individually evaluated for impaired |  |  |  |  | 34,595 |  | 37,716
Ending balance: collectively evaluated for impaired |  |  |  |  | 4,541,140 |  | 4,373,765
Commercial, financial, agricultural and other [Member] |  |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 23,755 | 21,956 | 29,627 | 22,663 |  |  |
Charge-offs | (639) | (498) | (8,579) | (8,357) |  |  |
Recoveries | 564 | 204 | 922 | 625 |  |  |
Provision for Loan, Lease, and Other Losses | 3,520 | (1,958) | 5,230 | 4,773 |  |  |
Ending Balance | 23,755 | 21,956 | 29,627 | 22,663 | 27,200 | 29,627 | 19,704
Ending balance: individually evaluated for impaired |  |  |  |  | 4,202 |  | 4,271
Ending balance: collectively evaluated for impaired |  |  |  |  | 22,998 |  | 15,433
Total |  |  |  |  | 1,126,881 | 1,052,109 | 1,071,531
Ending balance: individually evaluated for impaired |  |  |  |  | 22,852 |  | 23,773
Ending balance: collectively evaluated for impaired |  |  |  |  | 1,104,029 |  | 1,047,758
Real estate construction [Member] |  |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 1,518 | 5,899 | 2,063 | 6,600 |  |  |
Charge-offs | 0 | 0 | 0 | (296) |  |  |
Recoveries | 0 | 132 | 84 | 469 |  |  |
Provision for Loan, Lease, and Other Losses | 75 | 2,073 | (554) | 1,331 |  |  |
Ending Balance | 1,518 | 5,899 | 2,063 | 6,600 | 1,593 | 2,063 | 8,104
Ending balance: individually evaluated for impaired |  |  |  |  | 0 |  | 0
Ending balance: collectively evaluated for impaired |  |  |  |  | 1,593 |  | 8,104
Total |  |  |  |  | 179,710 | 120,785 | 115,788
Ending balance: individually evaluated for impaired |  |  |  |  | 0 |  | 199
Ending balance: collectively evaluated for impaired |  |  |  |  | 179,710 |  | 115,589
Residential real estate [Member] |  |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 2,923 | 6,125 | 3,664 | 7,727 |  |  |
Charge-offs | (301) | (551) | (1,351) | (2,286) |  |  |
Recoveries | 178 | 97 | 417 | 420 |  |  |
Provision for Loan, Lease, and Other Losses | (124) | (217) | (54) | (407) |  |  |
Ending Balance | 2,923 | 6,125 | 3,664 | 7,727 | 2,676 | 3,664 | 5,454
Ending balance: individually evaluated for impaired |  |  |  |  | 20 |  | 332
Ending balance: collectively evaluated for impaired |  |  |  |  | 2,656 |  | 5,122
Total |  |  |  |  | 1,204,220 | 1,226,344 | 1,234,842
Ending balance: individually evaluated for impaired |  |  |  |  | 6,037 |  | 6,854
Ending balance: collectively evaluated for impaired |  |  |  |  | 1,198,183 |  | 1,227,988
Commercial Real Estate [Member] |  |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 12,227 | 11,661 | 11,881 | 11,778 |  |  |
Charge-offs | (561) | (812) | (1,249) | (1,109) |  |  |
Recoveries | 33 | 177 | 186 | 432 |  |  |
Provision for Loan, Lease, and Other Losses | 703 | 1,528 | 1,584 | 1,453 |  |  |
Ending Balance | 12,227 | 11,661 | 11,881 | 11,778 | 12,402 | 11,881 | 12,554
Ending balance: individually evaluated for impaired |  |  |  |  | 33 |  | 29
Ending balance: collectively evaluated for impaired |  |  |  |  | 12,369 |  | 12,525
Total |  |  |  |  | 1,435,954 | 1,405,256 | 1,345,302
Ending balance: individually evaluated for impaired |  |  |  |  | 5,706 |  | 6,890
Ending balance: collectively evaluated for impaired |  |  |  |  | 1,430,248 |  | 1,338,412
Loans to individuals [Member] |  |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 4,921 | 5,084 | 4,816 | 5,457 |  |  |
Charge-offs | (900) | (1,019) | (3,283) | (2,581) |  |  |
Recoveries | 179 | 256 | 502 | 621 |  |  |
Provision for Loan, Lease, and Other Losses | 447 | 647 | 2,612 | 1,471 |  |  |
Ending Balance | $ 4,921 | $ 5,084 | $ 4,816 | $ 5,457 | 4,647 | 4,816 | 4,968
Ending balance: individually evaluated for impaired |  |  |  |  | 0 |  | 0
Ending balance: collectively evaluated for impaired |  |  |  |  | 4,647 |  | 4,968
Total |  |  |  |  | 628,970 | $ 652,814 | 644,018
Ending balance: individually evaluated for impaired |  |  |  |  | 0 |  | 0
Ending balance: collectively evaluated for impaired |  |  |  |  | $ 628,970 |  | $ 644,018

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition A valuation allowance for financing receivables that are expected to be uncollectible. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 + Details
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- Definition The valuation allowance for financing receivables that are expected to be uncollectible that were collectively evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 + Details
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- Definition Amount of valuation allowance for financing receivables that are expected to be uncollectible that were individually evaluated for impairment. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 + Details
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- Definition Amount of recovery of financing receivables doubtful of collection that were previously charged off. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953423-111524 + Details
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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=49124121&loc=d3e5074-111524 + Details
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