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Loans and Allowance for Credit Losses - Allowance for Credit Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning Balance |  | $ 50,812 |  |  |
Charge-offs |  | (3,508) |  |  |
Recoveries |  | 1,392 |  |  |
Provision for credit losses | $ 3,229 | 6,526 |  |  |
Ending Balance |  | 50,812 | $ 48,676 |  | $ 55,222
Ending balance: individually evaluated for impaired |  |  | 3,017 |  | 13,395
Ending balance: collectively evaluated for impaired |  |  | 45,659 |  | 41,827
Total |  |  | 4,907,961 | $ 4,879,347 | 4,798,755
Ending balance: individually evaluated for impaired |  |  | 38,366 |  | 54,196
Ending balance: collectively evaluated for impaired |  |  | 4,869,595 |  | 4,744,559
Residential real estate [Member] |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning Balance |  | 2,606 |  |  |
Charge-offs |  | (382) |  |  |
Recoveries |  | 118 |  |  |
Provision for credit losses |  | 286 |  |  |
Ending Balance |  | 2,606 | 2,445 |  | 2,628
Ending balance: individually evaluated for impaired |  |  |  |  | 75
Ending balance: collectively evaluated for impaired |  |  |  |  | 2,553
Total |  |  | 1,217,398 |  | 1,212,962
Ending balance: individually evaluated for impaired |  |  |  |  | 6,246
Ending balance: collectively evaluated for impaired |  |  |  |  | 1,206,716
Commercial Real Estate [Member] |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning Balance |  | 11,924 |  |  |
Charge-offs |  | (265) |  |  |
Recoveries |  | 756 |  |  |
Provision for credit losses |  | (6,932) |  |  |
Ending Balance |  | 11,924 | 6,582 |  | 5,483
Ending balance: individually evaluated for impaired |  |  | 376 |  | 420
Ending balance: collectively evaluated for impaired |  |  | 6,206 |  | 5,063
Total |  |  | 1,761,101 |  | 1,552,904
Ending balance: individually evaluated for impaired |  |  | 5,819 |  | 5,934
Ending balance: collectively evaluated for impaired |  |  | 1,755,282 |  | 1,546,970
Commercial, financial, agricultural and other [Member] |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning Balance |  | 31,035 |  |  |
Charge-offs |  | (1,392) |  |  |
Recoveries |  | 134 |  |  |
Provision for credit losses |  | 11,944 |  |  |
Ending Balance |  | 31,035 | 34,701 |  | 41,721
Ending balance: individually evaluated for impaired |  |  | 2,466 |  | 12,900
Ending balance: collectively evaluated for impaired |  |  | 32,235 |  | 28,821
Total |  |  | 1,148,460 |  | 1,190,384
Ending balance: individually evaluated for impaired |  |  | 26,260 |  | 42,016
Ending balance: collectively evaluated for impaired |  |  | 1,122,200 |  | 1,148,368
Real estate construction [Member] |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning Balance |  | 887 |  |  |
Charge-offs |  | 0 |  |  |
Recoveries |  | 223 |  |  |
Provision for credit losses |  | (209) |  |  |
Ending Balance |  | 887 | 614 |  | 901
Ending balance: individually evaluated for impaired |  |  | 0 |  | 0
Ending balance: collectively evaluated for impaired |  |  | 614 |  | 901
Total |  |  | 240,122 |  | 256,856
Ending balance: individually evaluated for impaired |  |  | 0 |  | 0
Ending balance: collectively evaluated for impaired |  |  | 240,122 |  | 256,856
Residential real estate [Member] |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Ending balance: individually evaluated for impaired |  |  | 175 |  |
Ending balance: collectively evaluated for impaired |  |  | 2,270 |  |
Ending balance: individually evaluated for impaired |  |  | 6,287 |  |
Ending balance: collectively evaluated for impaired |  |  | 1,211,111 |  |
Loans to individuals [Member] |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning Balance |  | 4,360 |  |  |
Charge-offs |  | (1,469) |  |  |
Recoveries |  | 161 |  |  |
Provision for credit losses |  | 1,437 |  |  |
Ending Balance |  | $ 4,360 | 4,334 |  | 4,489
Ending balance: individually evaluated for impaired |  |  | 0 |  | 0
Ending balance: collectively evaluated for impaired |  |  | 4,334 |  | 4,489
Total |  |  | 540,880 |  | 585,649
Ending balance: individually evaluated for impaired |  |  | 0 |  | 0
Ending balance: collectively evaluated for impaired |  |  | 540,880 |  | $ 585,649
Acquired Loans [Member] |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning Balance | 19 |  |  |  |
Charge-offs | (15) |  |  |  |
Recoveries | 7 |  |  |  |
Provision for credit losses | 20 |  |  |  |
Ending Balance | 19 |  | 31 | 19 |
Total |  |  | 94,686 | 100,876 |
Acquired Loans [Member] | Residential real estate [Member] |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning Balance | 19 |  |  |  |
Charge-offs | (8) |  |  |  |
Recoveries | 6 |  |  |  |
Provision for credit losses | 14 |  |  |  |
Ending Balance | 19 |  | 31 | 19 |
Total |  |  | 60,162 | 63,341 |
Acquired Loans [Member] | Commercial Real Estate [Member] |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning Balance | 0 |  |  |  |
Charge-offs | 0 |  |  |  |
Recoveries | 0 |  |  |  |
Provision for credit losses | 0 |  |  |  |
Ending Balance | 0 |  | 0 | 0 |
Total |  |  | 24,738 | 25,167 |
Acquired Loans [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning Balance | 0 |  |  |  |
Charge-offs | 0 |  |  |  |
Recoveries | 0 |  |  |  |
Provision for credit losses | 0 |  |  |  |
Ending Balance | 0 |  | 0 | 0 |
Total |  |  | 7,758 | 8,399 |
Acquired Loans [Member] | Real estate construction [Member] |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning Balance | 0 |  |  |  |
Charge-offs | 0 |  |  |  |
Recoveries | 0 |  |  |  |
Provision for credit losses | 0 |  |  |  |
Ending Balance | 0 |  | 0 | 0 |
Total |  |  | 139 | 1,781 |
Acquired Loans [Member] | Loans to individuals [Member] |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning Balance | 0 |  |  |  |
Charge-offs | (7) |  |  |  |
Recoveries | 1 |  |  |  |
Provision for credit losses | 6 |  |  |  |
Ending Balance | 0 |  | 0 | 0 |
Total |  |  | 1,889 | 2,188 |
Originated Loans [Member] |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning Balance | 50,166 |  |  |  |
Charge-offs | (5,519) |  |  |  |
Recoveries | 789 |  |  |  |
Provision for credit losses | 3,209 |  |  |  |
Ending Balance | 50,166 |  | 48,645 | 50,166 |
Total |  |  | 4,813,275 | 4,778,471 |
Originated Loans [Member] | Residential real estate [Member] |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning Balance | 2,492 |  |  |  |
Charge-offs | (465) |  |  |  |
Recoveries | 122 |  |  |  |
Provision for credit losses | 265 |  |  |  |
Ending Balance | 2,492 |  | 2,414 | 2,492 |
Total |  |  | 1,157,236 | 1,165,851 |
Originated Loans [Member] | Commercial Real Estate [Member] |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning Balance | 6,619 |  |  |  |
Charge-offs | (31) |  |  |  |
Recoveries | 117 |  |  |  |
Provision for credit losses | (123) |  |  |  |
Ending Balance | 6,619 |  | 6,582 | 6,619 |
Total |  |  | 1,736,363 | 1,717,043 |
Originated Loans [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning Balance | 35,974 |  |  |  |
Charge-offs | (3,825) |  |  |  |
Recoveries | 368 |  |  |  |
Provision for credit losses | 2,184 |  |  |  |
Ending Balance | 35,974 |  | 34,701 | 35,974 |
Total |  |  | 1,140,702 | 1,131,148 |
Originated Loans [Member] | Real estate construction [Member] |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning Balance | 577 |  |  |  |
Charge-offs | 0 |  |  |  |
Recoveries | 54 |  |  |  |
Provision for credit losses | (17) |  |  |  |
Ending Balance | 577 |  | 614 | 577 |
Total |  |  | 239,983 | 217,840 |
Originated Loans [Member] | Loans to individuals [Member] |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning Balance | 4,504 |  |  |  |
Charge-offs | (1,198) |  |  |  |
Recoveries | 128 |  |  |  |
Provision for credit losses | 900 |  |  |  |
Ending Balance | $ 4,504 |  | 4,334 | 4,504 |
Total |  |  | $ 538,991 | $ 546,589 |

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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=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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