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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, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Dec. 31, 2016
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |
Provision for credit losses | $ (1,609) | $ 10,372 | $ 1,620 | $ 16,898 |  |
Ending Balance |  | 59,821 |  | 59,821 | $ 48,067 |
Ending balance: individually evaluated for impaired |  | 15,530 |  | 15,530 | 2,135 |
Ending balance: collectively evaluated for impaired |  | 44,291 |  | 44,291 | 45,932 |
Total |  | 4,843,776 |  | 4,843,776 | 5,374,782 | $ 4,879,347
Ending balance: individually evaluated for impaired |  | 55,800 |  | 55,800 | 32,592 |
Ending balance: collectively evaluated for impaired |  | 4,787,976 |  | 4,787,976 | 5,342,190 |
Residential real estate [Member] |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |
Ending Balance |  | 2,605 |  | 2,605 | 2,120 |
Total |  | 1,199,005 |  | 1,199,005 | 1,416,926 |
Commercial Real Estate [Member] |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |
Ending Balance |  | 5,862 |  | 5,862 | 7,357 |
Ending balance: individually evaluated for impaired |  | 464 |  | 464 | 309 |
Ending balance: collectively evaluated for impaired |  | 5,398 |  | 5,398 | 7,048 |
Total |  | 1,648,222 |  | 1,648,222 | 1,963,001 |
Ending balance: individually evaluated for impaired |  | 6,017 |  | 6,017 | 8,697 |
Ending balance: collectively evaluated for impaired |  | 1,642,205 |  | 1,642,205 | 1,954,304 |
Commercial, financial, agricultural and other [Member] |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |
Ending Balance |  | 46,357 |  | 46,357 | 33,490 |
Ending balance: individually evaluated for impaired |  | 15,018 |  | 15,018 | 1,791 |
Ending balance: collectively evaluated for impaired |  | 31,339 |  | 31,339 | 31,699 |
Total |  | 1,185,062 |  | 1,185,062 | 1,199,800 |
Ending balance: individually evaluated for impaired |  | 43,817 |  | 43,817 | 16,917 |
Ending balance: collectively evaluated for impaired |  | 1,141,245 |  | 1,141,245 | 1,182,883 |
Real estate construction [Member] |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |
Ending Balance |  | 480 |  | 480 | 768 |
Ending balance: individually evaluated for impaired |  | 0 |  | 0 | 0 |
Ending balance: collectively evaluated for impaired |  | 480 |  | 480 | 768 |
Total |  | 242,132 |  | 242,132 | 249,255 |
Ending balance: individually evaluated for impaired |  | 0 |  | 0 | 0 |
Ending balance: collectively evaluated for impaired |  | 242,132 |  | 242,132 | 249,255 |
Residential real estate [Member] |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |
Ending balance: individually evaluated for impaired |  | 48 |  | 48 | 35 |
Ending balance: collectively evaluated for impaired |  | 2,557 |  | 2,557 | 2,085 |
Ending balance: individually evaluated for impaired |  | 5,966 |  | 5,966 | 6,978 |
Ending balance: collectively evaluated for impaired |  | 1,193,039 |  | 1,193,039 | 1,409,948 |
Loans to individuals [Member] |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |
Ending Balance |  | 4,517 |  | 4,517 | 4,332 |
Ending balance: individually evaluated for impaired |  | 0 |  | 0 | 0 |
Ending balance: collectively evaluated for impaired |  | 4,517 |  | 4,517 | 4,332 |
Total |  | 569,355 |  | 569,355 | 545,800 |
Ending balance: individually evaluated for impaired |  | 0 |  | 0 | 0 |
Ending balance: collectively evaluated for impaired |  | 569,355 |  | 569,355 | 545,800 |
Acquired Loans [Member] |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |
Beginning Balance | 31 |  | 19 |  |  |
Charge-offs | (2) |  | (17) |  |  |
Recoveries | 71 |  | 78 |  |  |
Provision for credit losses | 72 |  | 92 |  |  |
Ending Balance | 31 |  | 19 |  | 172 | 19
Total |  |  |  |  | 455,579 | 100,876
Acquired Loans [Member] | Residential real estate [Member] |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |
Beginning Balance | 31 |  | 19 |  |  |
Charge-offs | (1) |  | (9) |  |  |
Recoveries | 21 |  | 27 |  |  |
Provision for credit losses | (47) |  | (33) |  |  |
Ending Balance | 31 |  | 19 |  | 4 | 19
Total |  |  |  |  | 247,709 | 63,341
Acquired Loans [Member] | Commercial Real Estate [Member] |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |
Beginning Balance | 0 |  | 0 |  |  |
Charge-offs | 0 |  | 0 |  |  |
Recoveries | 4 |  | 4 |  |  |
Provision for credit losses | 46 |  | 46 |  |  |
Ending Balance | 0 |  | 0 |  | 50 | 0
Total |  |  |  |  | 143,411 | 25,167
Acquired Loans [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |
Beginning Balance | 0 |  | 0 |  |  |
Charge-offs | 0 |  | 0 |  |  |
Recoveries | 0 |  | 0 |  |  |
Provision for credit losses | 118 |  | 118 |  |  |
Ending Balance | 0 |  | 0 |  | 118 | 0
Total |  |  |  |  | 42,258 | 8,399
Acquired Loans [Member] | Real estate construction [Member] |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |
Beginning Balance | 0 |  | 0 |  |  |
Charge-offs | 0 |  | 0 |  |  |
Recoveries | 1 |  | 1 |  |  |
Provision for credit losses | (1) |  | (1) |  |  |
Ending Balance | 0 |  | 0 |  | 0 | 0
Total |  |  |  |  | 12,220 | 1,781
Acquired Loans [Member] | Loans to individuals [Member] |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |
Beginning Balance | 0 |  | 0 |  |  |
Charge-offs | (1) |  | (8) |  |  |
Recoveries | 45 |  | 46 |  |  |
Provision for credit losses | (44) |  | (38) |  |  |
Ending Balance | 0 |  | 0 |  | 0 | 0
Total |  |  |  |  | 9,981 | 2,188
Originated Loans [Member] |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |
Beginning Balance | 48,645 | 55,222 | 50,166 | 50,812 |  |
Charge-offs | (2,598) | (6,138) | (8,117) | (9,646) |  |
Recoveries | 3,529 | 365 | 4,318 | 1,757 |  |
Provision for credit losses | (1,681) | 10,372 | 1,528 | 16,898 |  |
Ending Balance | 48,645 | 55,222 | 50,166 | 50,812 | 47,895 | 50,166
Total |  |  |  |  | 4,919,203 | 4,778,471
Originated Loans [Member] | Residential real estate [Member] |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |
Beginning Balance | 2,414 | 2,628 | 2,492 | 2,606 |  |
Charge-offs | (145) | (220) | (610) | (602) |  |
Recoveries | 70 | 142 | 192 | 260 |  |
Provision for credit losses | (223) | 55 | 42 | 341 |  |
Ending Balance | 2,414 | 2,628 | 2,492 | 2,606 | 2,116 | 2,492
Total |  |  |  |  | 1,169,217 | 1,165,851
Originated Loans [Member] | Commercial Real Estate [Member] |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |
Beginning Balance | 6,582 | 5,483 | 6,619 | 11,924 |  |
Charge-offs | (29) | (143) | (60) | (408) |  |
Recoveries | 29 | 27 | 146 | 783 |  |
Provision for credit losses | 725 | 495 | 602 | (6,437) |  |
Ending Balance | 6,582 | 5,483 | 6,619 | 11,924 | 7,307 | 6,619
Total |  |  |  |  | 1,819,590 | 1,717,043
Originated Loans [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |
Beginning Balance | 34,701 | 41,721 | 35,974 | 31,035 |  |
Charge-offs | (1,452) | (4,753) | (5,277) | (6,145) |  |
Recoveries | 3,268 | 64 | 3,636 | 198 |  |
Provision for credit losses | (3,145) | 9,325 | (961) | 21,269 |  |
Ending Balance | 34,701 | 41,721 | 35,974 | 31,035 | 33,372 | 35,974
Total |  |  |  |  | 1,157,542 | 1,131,148
Originated Loans [Member] | Real estate construction [Member] |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |
Beginning Balance | 614 | 901 | 577 | 887 |  |
Charge-offs | 0 | 0 | 0 | 0 |  |
Recoveries | 42 | 4 | 96 | 227 |  |
Provision for credit losses | 112 | (425) | 95 | (634) |  |
Ending Balance | 614 | 901 | 577 | 887 | 768 | 577
Total |  |  |  |  | 237,035 | 217,840
Originated Loans [Member] | Loans to individuals [Member] |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |
Beginning Balance | 4,334 | 4,489 | 4,504 | 4,360 |  |
Charge-offs | (972) | (1,022) | (2,170) | (2,491) |  |
Recoveries | 120 | 128 | 248 | 289 |  |
Provision for credit losses | 850 | 922 | 1,750 | 2,359 |  |
Ending Balance | $ 4,334 | $ 4,489 | $ 4,504 | $ 4,360 | 4,332 | 4,504
Total |  |  |  |  | $ 535,819 | $ 546,589

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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 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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