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Loans and Allowance for Credit Losses - Allowance for Credit Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Dec. 31, 2016
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |
Provision for credit losses | $ 1,214 | $ 3,408 | $ 2,834 | $ 20,306 |  |
Ending Balance |  | 54,734 |  | 54,734 | $ 48,176 |
Ending balance: individually evaluated for impaired |  | 8,175 |  | 8,175 | 2,181 |
Ending balance: collectively evaluated for impaired |  | 46,559 |  | 46,559 | 45,995 |
Total |  | 4,860,652 |  | 4,860,652 | 5,375,847 | $ 4,879,347
Ending balance: individually evaluated for impaired |  | 46,252 |  | 46,252 | 31,326 |
Ending balance: collectively evaluated for impaired |  | 4,814,400 |  | 4,814,400 | 5,344,521 |
Residential real estate [Member] |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |
Ending Balance |  | 2,367 |  | 2,367 | 2,898 |
Total |  | 1,185,759 |  | 1,185,759 | 1,423,422 |
Commercial Real Estate [Member] |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |
Ending Balance |  | 5,584 |  | 5,584 | 17,367 |
Ending balance: individually evaluated for impaired |  | 430 |  | 430 | 261 |
Ending balance: collectively evaluated for impaired |  | 5,154 |  | 5,154 | 17,106 |
Total |  | 1,683,015 |  | 1,683,015 | 1,990,264 |
Ending balance: individually evaluated for impaired |  | 5,081 |  | 5,081 | 8,189 |
Ending balance: collectively evaluated for impaired |  | 1,677,934 |  | 1,677,934 | 1,982,075 |
Commercial, financial, agricultural and other [Member] |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |
Ending Balance |  | 41,923 |  | 41,923 | 23,144 |
Ending balance: individually evaluated for impaired |  | 7,739 |  | 7,739 | 1,818 |
Ending balance: collectively evaluated for impaired |  | 34,184 |  | 34,184 | 21,326 |
Total |  | 1,207,447 |  | 1,207,447 | 1,154,225 |
Ending balance: individually evaluated for impaired |  | 35,501 |  | 35,501 | 15,995 |
Ending balance: collectively evaluated for impaired |  | 1,171,946 |  | 1,171,946 | 1,138,230 |
Real estate construction [Member] |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |
Ending Balance |  | 476 |  | 476 | 1,341 |
Ending balance: individually evaluated for impaired |  | 0 |  | 0 | 0 |
Ending balance: collectively evaluated for impaired |  | 476 |  | 476 | 1,341 |
Total |  | 229,375 |  | 229,375 | 259,129 |
Ending balance: individually evaluated for impaired |  | 0 |  | 0 | 0 |
Ending balance: collectively evaluated for impaired |  | 229,375 |  | 229,375 | 259,129 |
Residential real estate [Member] |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |
Ending balance: individually evaluated for impaired |  | 6 |  | 6 | 102 |
Ending balance: collectively evaluated for impaired |  | 2,361 |  | 2,361 | 2,796 |
Ending balance: individually evaluated for impaired |  | 5,670 |  | 5,670 | 7,142 |
Ending balance: collectively evaluated for impaired |  | 1,180,089 |  | 1,180,089 | 1,416,280 |
Loans to individuals [Member] |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |
Ending Balance |  | 4,384 |  | 4,384 | 3,426 |
Ending balance: individually evaluated for impaired |  | 0 |  | 0 | 0 |
Ending balance: collectively evaluated for impaired |  | 4,384 |  | 4,384 | 3,426 |
Total |  | 555,056 |  | 555,056 | 548,807 |
Ending balance: individually evaluated for impaired |  | 0 |  | 0 | 0 |
Ending balance: collectively evaluated for impaired |  | 555,056 |  | 555,056 | 548,807 |
Acquired Loans [Member] |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |
Beginning Balance | 172 |  | 19 |  |  |
Charge-offs | (26) |  | (43) |  |  |
Recoveries | 28 |  | 106 |  |  |
Provision for credit losses | 356 |  | 448 |  |  |
Ending Balance | 172 |  | 19 |  | 530 | 19
Total |  |  |  |  | 424,998 | 100,876
Acquired Loans [Member] | Residential real estate [Member] |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |
Beginning Balance | 4 |  | 19 |  |  |
Charge-offs | (17) |  | (26) |  |  |
Recoveries | 18 |  | 45 |  |  |
Provision for credit losses | 1 |  | (32) |  |  |
Ending Balance | 4 |  | 19 |  | 6 | 19
Total |  |  |  |  | 232,560 | 63,341
Acquired Loans [Member] | Commercial Real Estate [Member] |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |
Beginning Balance | 50 |  | 0 |  |  |
Charge-offs | 0 |  | 0 |  |  |
Recoveries | 0 |  | 4 |  |  |
Provision for credit losses | (6) |  | 40 |  |  |
Ending Balance | 50 |  | 0 |  | 44 | 0
Total |  |  |  |  | 132,701 | 25,167
Acquired Loans [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |
Beginning Balance | 118 |  | 0 |  |  |
Charge-offs | 0 |  | 0 |  |  |
Recoveries | 1 |  | 1 |  |  |
Provision for credit losses | 361 |  | 479 |  |  |
Ending Balance | 118 |  | 0 |  | 480 | 0
Total |  |  |  |  | 42,893 | 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 | 4 |  | 5 |  |  |
Provision for credit losses | (4) |  | (5) |  |  |
Ending Balance | 0 |  | 0 |  | 0 | 0
Total |  |  |  |  | 10,222 | 1,781
Acquired Loans [Member] | Loans to individuals [Member] |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |
Beginning Balance | 0 |  | 0 |  |  |
Charge-offs | (9) |  | (17) |  |  |
Recoveries | 5 |  | 51 |  |  |
Provision for credit losses | 4 |  | (34) |  |  |
Ending Balance | 0 |  | 0 |  | 0 | 0
Total |  |  |  |  | 6,622 | 2,188
Originated Loans [Member] |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |
Beginning Balance | 47,895 | 59,821 | 50,166 | 50,812 |  |
Charge-offs | (1,893) | (8,807) | (10,010) | (18,453) |  |
Recoveries | 786 | 312 | 5,104 | 2,069 |  |
Provision for credit losses | 858 | 3,408 | 2,386 | 20,306 |  |
Ending Balance | 47,895 | 59,821 | 50,166 | 50,812 | 47,646 | 50,166
Total |  |  |  |  | 4,950,849 | 4,778,471
Originated Loans [Member] | Residential real estate [Member] |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |
Beginning Balance | 2,116 | 2,605 | 2,492 | 2,606 |  |
Charge-offs | (344) | (374) | (954) | (976) |  |
Recoveries | 67 | 147 | 259 | 407 |  |
Provision for credit losses | 1,053 | (11) | 1,095 | 330 |  |
Ending Balance | 2,116 | 2,605 | 2,492 | 2,606 | 2,892 | 2,492
Total |  |  |  |  | 1,190,862 | 1,165,851
Originated Loans [Member] | Commercial Real Estate [Member] |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |
Beginning Balance | 7,307 | 5,862 | 6,619 | 11,924 |  |
Charge-offs | (35) | (10) | (95) | (418) |  |
Recoveries | 60 | 20 | 206 | 803 |  |
Provision for credit losses | 9,991 | (288) | 10,593 | (6,725) |  |
Ending Balance | 7,307 | 5,862 | 6,619 | 11,924 | 17,323 | 6,619
Total |  |  |  |  | 1,857,563 | 1,717,043
Originated Loans [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |
Beginning Balance | 33,372 | 46,357 | 35,974 | 31,035 |  |
Charge-offs | (499) | (7,163) | (5,776) | (13,308) |  |
Recoveries | 183 | 63 | 3,819 | 261 |  |
Provision for credit losses | (10,392) | 2,666 | (11,353) | 23,935 |  |
Ending Balance | 33,372 | 46,357 | 35,974 | 31,035 | 22,664 | 35,974
Total |  |  |  |  | 1,111,332 | 1,131,148
Originated Loans [Member] | Real estate construction [Member] |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |
Beginning Balance | 768 | 480 | 577 | 887 |  |
Charge-offs | 0 | 0 | 0 | 0 |  |
Recoveries | 369 | 0 | 465 | 227 |  |
Provision for credit losses | 204 | (4) | 299 | (638) |  |
Ending Balance | 768 | 480 | 577 | 887 | 1,341 | 577
Total |  |  |  |  | 248,907 | 217,840
Originated Loans [Member] | Loans to individuals [Member] |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |
Beginning Balance | 4,332 | 4,517 | 4,504 | 4,360 |  |
Charge-offs | (1,015) | (1,260) | (3,185) | (3,751) |  |
Recoveries | 107 | 82 | 355 | 371 |  |
Provision for credit losses | 2 | 1,045 | 1,752 | 3,404 |  |
Ending Balance | $ 4,332 | $ 4,517 | $ 4,504 | $ 4,360 | 3,426 | 4,504
Total |  |  |  |  | $ 542,185 | $ 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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