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Loans and Allowance for Credit Losses - Allowance for Credit Losses (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | $ 50,185 | $ 50,812 | $ 52,051
Charge-offs |  |  | (18,868)
Recoveries |  |  | 2,681
Provision for credit losses | 5,087 | 18,480 | 14,948
Ending Balance | 48,298 | 50,185 | 50,812
Ending balance: individually evaluated for impaired | 3,746 | 3,144 | 7,045
Ending balance: collectively evaluated for impaired | 44,552 | 47,041 | 43,767
Ending balance | 5,407,376 | 4,879,347 | 4,683,750
Ending balance: individually evaluated for impaired | 35,151 | 33,668 | 44,009
Ending balance: collectively evaluated for impaired | 5,372,225 | 4,845,679 | 4,639,741
Commercial, financial, agricultural and other [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 35,974 | 31,035 | 29,627
Charge-offs |  |  | (11,429)
Recoveries |  |  | 1,097
Provision for credit losses |  |  | 11,740
Ending Balance | 23,429 | 35,974 | 31,035
Ending balance: individually evaluated for impaired | 3,478 | 2,530 | 6,952
Ending balance: collectively evaluated for impaired | 19,951 | 33,444 | 24,083
Ending balance | 1,163,383 | 1,139,547 | 1,150,906
Ending balance: individually evaluated for impaired | 22,450 | 22,325 | 30,767
Ending balance: collectively evaluated for impaired | 1,140,933 | 1,117,222 | 1,120,139
Real Estate Construction [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 577 | 887 | 2,063
Charge-offs |  |  | (8)
Recoveries |  |  | 84
Provision for credit losses |  |  | (1,252)
Ending Balance | 1,349 | 577 | 887
Ending balance: individually evaluated for impaired | 0 | 0 | 0
Ending balance: collectively evaluated for impaired | 1,349 | 577 | 887
Ending balance | 248,868 | 219,621 | 220,736
Ending balance: individually evaluated for impaired | 0 | 0 | 0
Ending balance: collectively evaluated for impaired | 248,868 | 219,621 | 220,736
Residential real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 2,511 | 2,606 | 3,664
Charge-offs |  |  | (1,539)
Recoveries |  |  | 587
Provision for credit losses |  |  | (106)
Ending Balance | 2,759 | 2,511 | 2,606
Ending balance: individually evaluated for impaired | 111 | 180 | 51
Ending balance: collectively evaluated for impaired | 2,648 | 2,331 | 2,555
Ending balance | 1,426,370 | 1,229,192 | 1,224,465
Ending balance: individually evaluated for impaired | 6,698 | 5,875 | 6,099
Ending balance: collectively evaluated for impaired | 1,419,672 | 1,223,317 | 1,218,366
Commercial real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 6,619 | 11,924 | 11,881
Charge-offs |  |  | (1,538)
Recoveries |  |  | 229
Provision for credit losses |  |  | 1,352
Ending Balance | 17,357 | 6,619 | 11,924
Ending balance: individually evaluated for impaired | 157 | 434 | 42
Ending balance: collectively evaluated for impaired | 17,200 | 6,185 | 11,882
Ending balance | 2,019,096 | 1,742,210 | 1,479,000
Ending balance: individually evaluated for impaired | 6,003 | 5,468 | 7,143
Ending balance: collectively evaluated for impaired | 2,013,093 | 1,736,742 | 1,471,857
Loans To Individuals [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 4,504 | 4,360 | 4,816
Charge-offs |  |  | (4,354)
Recoveries |  |  | 684
Provision for credit losses |  |  | 3,214
Ending Balance | 3,404 | 4,504 | 4,360
Ending balance: individually evaluated for impaired | 0 | 0 | 0
Ending balance: collectively evaluated for impaired | 3,404 | 4,504 | 4,360
Ending balance | 549,659 | 548,777 | 608,643
Ending balance: individually evaluated for impaired | 0 | 0 | 0
Ending balance: collectively evaluated for impaired | 549,659 | 548,777 | 608,643
Originated Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 50,166 | 50,812 |
Charge-offs | (11,997) | (26,305) |
Recoveries | 5,403 | 7,198 |
Provision for credit losses | 4,680 | 18,461 |
Ending Balance | 48,252 | 50,166 | 50,812
Ending balance | 5,007,361 | 4,778,471 |
Originated Loans [Member] | Commercial, financial, agricultural and other [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 35,974 | 31,035 |
Charge-offs | (6,176) | (19,603) |
Recoveries | 3,900 | 4,164 |
Provision for credit losses | (10,280) | 20,378 |
Ending Balance | 23,418 | 35,974 | 31,035
Ending balance | 1,122,741 | 1,131,148 |
Originated Loans [Member] | Real Estate Construction [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 577 | 887 |
Charge-offs | 0 | 0 |
Recoveries | 465 | 562 |
Provision for credit losses | 307 | (872) |
Ending Balance | 1,349 | 577 | 887
Ending balance | 242,905 | 217,840 |
Originated Loans [Member] | Residential real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 2,492 | 2,606 |
Charge-offs | (1,261) | (1,189) |
Recoveries | 304 | 481 |
Provision for credit losses | 1,218 | 594 |
Ending Balance | 2,753 | 2,492 | 2,606
Ending balance | 1,206,119 | 1,165,851 |
Originated Loans [Member] | Commercial real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 6,619 | 11,924 |
Charge-offs | (340) | (570) |
Recoveries | 274 | 1,522 |
Provision for credit losses | 10,775 | (6,257) |
Ending Balance | 17,328 | 6,619 | 11,924
Ending balance | 1,892,185 | 1,717,043 |
Originated Loans [Member] | Loans To Individuals [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 4,504 | 4,360 |
Charge-offs | (4,220) | (4,943) |
Recoveries | 460 | 469 |
Provision for credit losses | 2,660 | 4,618 |
Ending Balance | 3,404 | 4,504 | $ 4,360
Ending balance | 543,411 | 546,589 |
Acquired Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 19 |  |
Charge-offs | (512) |  |
Recoveries | 132 |  |
Provision for credit losses | 407 |  |
Ending Balance | 46 | 19 |
Ending balance | 400,015 | 100,876 |
Acquired Loans [Member] | Commercial, financial, agricultural and other [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 0 |  |
Charge-offs | (458) |  |
Recoveries | 1 |  |
Provision for credit losses | 468 |  |
Ending Balance | 11 | 0 |
Ending balance | 40,642 | 8,399 |
Acquired Loans [Member] | Real Estate Construction [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 0 |  |
Charge-offs | 0 |  |
Recoveries | 5 |  |
Provision for credit losses | (5) |  |
Ending Balance | 0 | 0 |
Ending balance | 5,963 | 1,781 |
Acquired Loans [Member] | Residential real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 19 |  |
Charge-offs | (26) |  |
Recoveries | 67 |  |
Provision for credit losses | (54) |  |
Ending Balance | 6 | 19 |
Ending balance | 220,251 | 63,341 |
Acquired Loans [Member] | Commercial real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 0 |  |
Charge-offs | 0 |  |
Recoveries | 4 |  |
Provision for credit losses | 25 |  |
Ending Balance | 29 | 0 |
Ending balance | 126,911 | 25,167 |
Acquired Loans [Member] | Loans To Individuals [Member] |  |  |
Financing Receivable, Allowance for Credit Losses [Roll Forward] |  |  |
Beginning Balance | 0 |  |
Charge-offs | (28) |  |
Recoveries | 55 |  |
Provision for credit losses | (27) |  |
Ending Balance | 0 | 0 |
Ending balance | $ 6,248 | $ 2,188 |

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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=84173941&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=84173941&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=84173941&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=84173941&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=84173941&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=84173941&loc=SL6953423-111524 + Details
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- Definition The balance of financing receivables 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 (h) -URI http://asc.fasb.org/extlink&oid=84173941&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=82891408&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=84173941&loc=d3e5074-111524 + Details
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