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Loans and Allowance for Credit Losses - Allowance for Credit Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Jun. 30, 2015 | Jun. 30, 2016 | Dec. 31, 2015 | Jun. 30, 2015
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | $ 55,222 | $ 46,697 | $ 50,812 | $ 52,051 |  |  |
Charge-offs | (6,138) | (4,952) | (9,646) | (12,061) |  |  |
Recoveries | 365 | 561 | 1,757 | 1,157 |  |  |
Provision for Loan, Lease, and Other Losses | 10,372 | 3,038 | 16,898 | 4,197 |  |  |
Ending Balance | 55,222 | 46,697 | 50,812 | 52,051 | $ 59,821 | $ 50,812 | $ 45,344
Ending balance: individually evaluated for impaired |  |  |  |  | 15,530 |  | 1,675
Ending balance: collectively evaluated for impaired |  |  |  |  | 44,291 |  | 43,669
Total |  |  |  |  | 4,843,776 | 4,683,750 | 4,490,854
Ending balance: individually evaluated for impaired |  |  |  |  | 55,800 |  | 36,744
Ending balance: collectively evaluated for impaired |  |  |  |  | 4,787,976 |  | 4,454,110
Commercial, financial, agricultural and other [Member] |  |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 41,721 | 24,406 | 31,035 | 29,627 |  |  |
Charge-offs | (4,753) | (2,860) | (6,145) | (7,940) |  |  |
Recoveries | 64 | 158 | 198 | 358 |  |  |
Provision for Loan, Lease, and Other Losses | 9,325 | 2,051 | 21,269 | 1,710 |  |  |
Ending Balance | 41,721 | 24,406 | 31,035 | 29,627 | 46,357 | 31,035 | 23,755
Ending balance: individually evaluated for impaired |  |  |  |  | 15,018 |  | 1,596
Ending balance: collectively evaluated for impaired |  |  |  |  | 31,339 |  | 22,159
Total |  |  |  |  | 1,185,062 | 1,150,906 | 1,098,019
Ending balance: individually evaluated for impaired |  |  |  |  | 43,817 |  | 21,419
Ending balance: collectively evaluated for impaired |  |  |  |  | 1,141,245 |  | 1,076,600
Real estate construction [Member] |  |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 901 | 1,528 | 887 | 2,063 |  |  |
Charge-offs | 0 | 0 | 0 | 0 |  |  |
Recoveries | 4 | 84 | 227 | 84 |  |  |
Provision for Loan, Lease, and Other Losses | (425) | (94) | (634) | (629) |  |  |
Ending Balance | 901 | 1,528 | 887 | 2,063 | 480 | 887 | 1,518
Ending balance: individually evaluated for impaired |  |  |  |  | 0 |  | 0
Ending balance: collectively evaluated for impaired |  |  |  |  | 480 |  | 1,518
Total |  |  |  |  | 242,132 | 220,736 | 125,010
Ending balance: individually evaluated for impaired |  |  |  |  | 0 |  | 0
Ending balance: collectively evaluated for impaired |  |  |  |  | 242,132 |  | 125,010
Residential real estate [Member] |  |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 2,628 | 3,387 | 2,606 | 3,664 |  |  |
Charge-offs | (220) | (484) | (602) | (1,050) |  |  |
Recoveries | 142 | 143 | 260 | 239 |  |  |
Provision for Loan, Lease, and Other Losses | 55 | (123) | 341 | 70 |  |  |
Ending Balance | 2,628 | 3,387 | 2,606 | 3,664 | 2,605 | 2,606 | 2,923
Ending balance: individually evaluated for impaired |  |  |  |  | 48 |  | 35
Ending balance: collectively evaluated for impaired |  |  |  |  | 2,557 |  | 2,888
Total |  |  |  |  | 1,199,005 | 1,224,465 | 1,204,499
Ending balance: individually evaluated for impaired |  |  |  |  | 5,966 |  | 7,700
Ending balance: collectively evaluated for impaired |  |  |  |  | 1,193,039 |  | 1,196,799
Commercial Real Estate [Member] |  |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 5,483 | 12,487 | 11,924 | 11,881 |  |  |
Charge-offs | (143) | (486) | (408) | (688) |  |  |
Recoveries | 27 | 15 | 783 | 153 |  |  |
Provision for Loan, Lease, and Other Losses | 495 | 211 | (6,437) | 881 |  |  |
Ending Balance | 5,483 | 12,487 | 11,924 | 11,881 | 5,862 | 11,924 | 12,227
Ending balance: individually evaluated for impaired |  |  |  |  | 464 |  | 44
Ending balance: collectively evaluated for impaired |  |  |  |  | 5,398 |  | 12,183
Total |  |  |  |  | 1,648,222 | 1,479,000 | 1,416,841
Ending balance: individually evaluated for impaired |  |  |  |  | 6,017 |  | 7,625
Ending balance: collectively evaluated for impaired |  |  |  |  | 1,642,205 |  | 1,409,216
Loans to individuals [Member] |  |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 4,489 | 4,889 | 4,360 | 4,816 |  |  |
Charge-offs | (1,022) | (1,122) | (2,491) | (2,383) |  |  |
Recoveries | 128 | 161 | 289 | 323 |  |  |
Provision for Loan, Lease, and Other Losses | 922 | 993 | 2,359 | 2,165 |  |  |
Ending Balance | $ 4,489 | $ 4,889 | $ 4,360 | $ 4,816 | 4,517 | 4,360 | 4,921
Ending balance: individually evaluated for impaired |  |  |  |  | 0 |  | 0
Ending balance: collectively evaluated for impaired |  |  |  |  | 4,517 |  | 4,921
Total |  |  |  |  | 569,355 | $ 608,643 | 646,485
Ending balance: individually evaluated for impaired |  |  |  |  | 0 |  | 0
Ending balance: collectively evaluated for impaired |  |  |  |  | $ 569,355 |  | $ 646,485

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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 The balance of financing receivables 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 (h) -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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