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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, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | $ 59,821 | $ 45,344 | $ 50,812 | $ 52,051 |  |  |
Charge-offs | (8,807) | (2,401) | (18,453) | (14,462) |  |  |
Recoveries | 312 | 954 | 2,069 | 2,111 |  |  |
Provision for Loan, Lease, and Other Losses | 3,408 | 4,621 | 20,306 | 8,818 |  |  |
Ending Balance | 59,821 | 45,344 | 50,812 | 52,051 | $ 54,734 | $ 50,812 | $ 48,518
Ending balance: individually evaluated for impaired |  |  |  |  | 8,175 |  | 4,255
Ending balance: collectively evaluated for impaired |  |  |  |  | 46,559 |  | 44,263
Total |  |  |  |  | 4,860,652 | 4,683,750 | 4,575,735
Ending balance: individually evaluated for impaired |  |  |  |  | 46,252 |  | 34,595
Ending balance: collectively evaluated for impaired |  |  |  |  | 4,814,400 |  | 4,541,140
Commercial, financial, agricultural and other [Member] |  |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 46,357 | 23,755 | 31,035 | 29,627 |  |  |
Charge-offs | (7,163) | (639) | (13,308) | (8,579) |  |  |
Recoveries | 63 | 564 | 261 | 922 |  |  |
Provision for Loan, Lease, and Other Losses | 2,666 | 3,520 | 23,935 | 5,230 |  |  |
Ending Balance | 46,357 | 23,755 | 31,035 | 29,627 | 41,923 | 31,035 | 27,200
Ending balance: individually evaluated for impaired |  |  |  |  | 7,739 |  | 4,202
Ending balance: collectively evaluated for impaired |  |  |  |  | 34,184 |  | 22,998
Total |  |  |  |  | 1,207,447 | 1,150,906 | 1,126,881
Ending balance: individually evaluated for impaired |  |  |  |  | 35,501 |  | 22,852
Ending balance: collectively evaluated for impaired |  |  |  |  | 1,171,946 |  | 1,104,029
Real estate construction [Member] |  |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 480 | 1,518 | 887 | 2,063 |  |  |
Charge-offs | 0 | 0 | 0 | 0 |  |  |
Recoveries | 0 | 0 | 227 | 84 |  |  |
Provision for Loan, Lease, and Other Losses | (4) | 75 | (638) | (554) |  |  |
Ending Balance | 480 | 1,518 | 887 | 2,063 | 476 | 887 | 1,593
Ending balance: individually evaluated for impaired |  |  |  |  | 0 |  | 0
Ending balance: collectively evaluated for impaired |  |  |  |  | 476 |  | 1,593
Total |  |  |  |  | 229,375 | 220,736 | 179,710
Ending balance: individually evaluated for impaired |  |  |  |  | 0 |  | 0
Ending balance: collectively evaluated for impaired |  |  |  |  | 229,375 |  | 179,710
Residential real estate [Member] |  |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 2,605 | 2,923 | 2,606 | 3,664 |  |  |
Charge-offs | (374) | (301) | (976) | (1,351) |  |  |
Recoveries | 147 | 178 | 407 | 417 |  |  |
Provision for Loan, Lease, and Other Losses | (11) | (124) | 330 | (54) |  |  |
Ending Balance | 2,605 | 2,923 | 2,606 | 3,664 | 2,367 | 2,606 | 2,676
Ending balance: individually evaluated for impaired |  |  |  |  | 6 |  | 20
Ending balance: collectively evaluated for impaired |  |  |  |  | 2,361 |  | 2,656
Total |  |  |  |  | 1,185,759 | 1,224,465 | 1,204,220
Ending balance: individually evaluated for impaired |  |  |  |  | 5,670 |  | 6,037
Ending balance: collectively evaluated for impaired |  |  |  |  | 1,180,089 |  | 1,198,183
Commercial Real Estate [Member] |  |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 5,862 | 12,227 | 11,924 | 11,881 |  |  |
Charge-offs | (10) | (561) | (418) | (1,249) |  |  |
Recoveries | 20 | 33 | 803 | 186 |  |  |
Provision for Loan, Lease, and Other Losses | (288) | 703 | (6,725) | 1,584 |  |  |
Ending Balance | 5,862 | 12,227 | 11,924 | 11,881 | 5,584 | 11,924 | 12,402
Ending balance: individually evaluated for impaired |  |  |  |  | 430 |  | 33
Ending balance: collectively evaluated for impaired |  |  |  |  | 5,154 |  | 12,369
Total |  |  |  |  | 1,683,015 | 1,479,000 | 1,435,954
Ending balance: individually evaluated for impaired |  |  |  |  | 5,081 |  | 5,706
Ending balance: collectively evaluated for impaired |  |  |  |  | 1,677,934 |  | 1,430,248
Loans to individuals [Member] |  |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 4,517 | 4,921 | 4,360 | 4,816 |  |  |
Charge-offs | (1,260) | (900) | (3,751) | (3,283) |  |  |
Recoveries | 82 | 179 | 371 | 502 |  |  |
Provision for Loan, Lease, and Other Losses | 1,045 | 447 | 3,404 | 2,612 |  |  |
Ending Balance | $ 4,517 | $ 4,921 | $ 4,360 | $ 4,816 | 4,384 | 4,360 | 4,647
Ending balance: individually evaluated for impaired |  |  |  |  | 0 |  | 0
Ending balance: collectively evaluated for impaired |  |  |  |  | 4,384 |  | 4,647
Total |  |  |  |  | 555,056 | $ 608,643 | 628,970
Ending balance: individually evaluated for impaired |  |  |  |  | 0 |  | 0
Ending balance: collectively evaluated for impaired |  |  |  |  | $ 555,056 |  | $ 628,970

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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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