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Loans and Allowance for Credit Losses - Allowance for Credit Losses (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | $ 50,812 | $ 52,051 | $ 54,225
Charge-offs |  | (18,868) | (17,472)
Recoveries |  | 2,681 | 4,102
Provision for credit losses | 18,480 | 14,948 | 11,196
Ending Balance | 50,185 | 50,812 | 52,051
Ending balance: individually evaluated for impaired | 3,144 | 7,045 | 9,461
Ending balance: collectively evaluated for impaired | 47,041 | 43,767 | 42,590
Ending balance | 4,879,347 | 4,683,750 | 4,457,308
Ending balance: individually evaluated for impaired | 33,668 | 44,009 | 48,442
Ending balance: collectively evaluated for impaired | 4,845,679 | 4,639,741 | 4,408,866
Commercial, financial, agricultural and other [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 31,035 | 29,627 | 22,663
Charge-offs |  | (11,429) | (8,911)
Recoveries |  | 1,097 | 734
Provision for credit losses |  | 11,740 | 15,141
Ending Balance | 35,974 | 31,035 | 29,627
Ending balance: individually evaluated for impaired | 2,530 | 6,952 | 9,304
Ending balance: collectively evaluated for impaired | 33,444 | 24,083 | 20,323
Ending balance | 1,139,547 | 1,150,906 | 1,052,109
Ending balance: individually evaluated for impaired | 22,325 | 30,767 | 33,332
Ending balance: collectively evaluated for impaired | 1,117,222 | 1,120,139 | 1,018,777
Real Estate Construction [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 887 | 2,063 | 6,600
Charge-offs |  | (8) | (296)
Recoveries |  | 84 | 1,340
Provision for credit losses |  | (1,252) | (5,581)
Ending Balance | 577 | 887 | 2,063
Ending balance: individually evaluated for impaired | 0 | 0 | 0
Ending balance: collectively evaluated for impaired | 577 | 887 | 2,063
Ending balance | 219,621 | 220,736 | 120,785
Ending balance: individually evaluated for impaired | 0 | 0 | 193
Ending balance: collectively evaluated for impaired | 219,621 | 220,736 | 120,592
Residential real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 2,606 | 3,664 | 7,727
Charge-offs |  | (1,539) | (3,153)
Recoveries |  | 587 | 650
Provision for credit losses |  | (106) | (1,560)
Ending Balance | 2,511 | 2,606 | 3,664
Ending balance: individually evaluated for impaired | 180 | 51 | 56
Ending balance: collectively evaluated for impaired | 2,331 | 2,555 | 3,608
Ending balance | 1,229,192 | 1,224,465 | 1,226,344
Ending balance: individually evaluated for impaired | 5,875 | 6,099 | 7,127
Ending balance: collectively evaluated for impaired | 1,223,317 | 1,218,366 | 1,219,217
Commercial real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 11,924 | 11,881 | 11,778
Charge-offs |  | (1,538) | (1,148)
Recoveries |  | 229 | 612
Provision for credit losses |  | 1,352 | 639
Ending Balance | 6,619 | 11,924 | 11,881
Ending balance: individually evaluated for impaired | 434 | 42 | 101
Ending balance: collectively evaluated for impaired | 6,185 | 11,882 | 11,780
Ending balance | 1,742,210 | 1,479,000 | 1,405,256
Ending balance: individually evaluated for impaired | 5,468 | 7,143 | 7,790
Ending balance: collectively evaluated for impaired | 1,736,742 | 1,471,857 | 1,397,466
Loans To Individuals [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 4,360 | 4,816 | 5,457
Charge-offs |  | (4,354) | (3,964)
Recoveries |  | 684 | 766
Provision for credit losses |  | 3,214 | 2,557
Ending Balance | 4,504 | 4,360 | 4,816
Ending balance: individually evaluated for impaired | 0 | 0 | 0
Ending balance: collectively evaluated for impaired | 4,504 | 4,360 | 4,816
Ending balance | 548,777 | 608,643 | 652,814
Ending balance: individually evaluated for impaired | 0 | 0 | 0
Ending balance: collectively evaluated for impaired | 548,777 | 608,643 | $ 652,814
Originated Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 50,812 |  |
Charge-offs | (26,305) |  |
Recoveries | 7,198 |  |
Provision for credit losses | 18,461 |  |
Ending Balance | 50,166 | 50,812 |
Ending balance | 4,778,471 |  |
Originated Loans [Member] | Commercial, financial, agricultural and other [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 31,035 |  |
Charge-offs | (19,603) |  |
Recoveries | 4,164 |  |
Provision for credit losses | 20,378 |  |
Ending Balance | 35,974 | 31,035 |
Ending balance | 1,131,148 |  |
Originated Loans [Member] | Real Estate Construction [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 887 |  |
Charge-offs | 0 |  |
Recoveries | 562 |  |
Provision for credit losses | (872) |  |
Ending Balance | 577 | 887 |
Ending balance | 217,840 |  |
Originated Loans [Member] | Residential real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 2,606 |  |
Charge-offs | (1,189) |  |
Recoveries | 481 |  |
Provision for credit losses | 594 |  |
Ending Balance | 2,492 | 2,606 |
Ending balance | 1,165,851 |  |
Originated Loans [Member] | Commercial real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 11,924 |  |
Charge-offs | (570) |  |
Recoveries | 1,522 |  |
Provision for credit losses | (6,257) |  |
Ending Balance | 6,619 | 11,924 |
Ending balance | 1,717,043 |  |
Originated Loans [Member] | Loans To Individuals [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 4,360 |  |
Charge-offs | (4,943) |  |
Recoveries | 469 |  |
Provision for credit losses | 4,618 |  |
Ending Balance | 4,504 | $ 4,360 |
Ending balance | 546,589 |  |
Acquired Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Ending Balance | 19 |  |
Ending balance | 100,876 |  |
Acquired Loans [Member] | Commercial, financial, agricultural and other [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Ending Balance | 0 |  |
Ending balance | 8,399 |  |
Acquired Loans [Member] | Real Estate Construction [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Ending Balance | 0 |  |
Ending balance | 1,781 |  |
Acquired Loans [Member] | Residential real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Ending Balance | 19 |  |
Ending balance | 63,341 |  |
Acquired Loans [Member] | Commercial real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Ending Balance | 0 |  |
Ending balance | 25,167 |  |
Acquired Loans [Member] | Loans To Individuals [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Ending Balance | 0 |  |
Ending balance | $ 2,188 |  |

X
- 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=66008989&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=66008989&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=66008989&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=66008989&loc=SL6953423-111524 + Details
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- Definition Amount of direct write-downs of financing receivables charged against the allowance. + 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)(3) -URI http://asc.fasb.org/extlink&oid=66008989&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=66008989&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=65884687&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=66008989&loc=d3e5074-111524 + Details
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