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Loans and Allowance for Credit Losses - Allowance for Credit Losses (Detail) - USD ($) $ in Thousands | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Mar. 31, 2018 | Dec. 31, 2017 | Mar. 31, 2017
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Provision for credit losses | $ 6,903 | $ 3,229 |  |  |
Ending Balance |  |  | $ 53,732 |  | $ 48,676
Ending balance: individually evaluated for impaired |  |  | 11,473 |  | 3,017
Ending balance: collectively evaluated for impaired |  |  | 42,259 |  | 45,659
Total |  |  | 5,381,305 | $ 5,407,376 | 4,907,961
Ending balance: individually evaluated for impaired |  |  | 50,491 |  | 38,366
Ending balance: collectively evaluated for impaired |  |  | 5,330,814 |  | 4,869,595
Residential real estate [Member] |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Ending Balance |  |  | 3,154 |  | 2,445
Total |  |  | 1,434,623 |  | 1,217,398
Commercial Real Estate [Member] |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Ending Balance |  |  | 18,496 |  | 6,582
Ending balance: individually evaluated for impaired |  |  | 2,141 |  | 376
Ending balance: collectively evaluated for impaired |  |  | 16,355 |  | 6,206
Total |  |  | 2,027,072 |  | 1,761,101
Ending balance: individually evaluated for impaired |  |  | 10,360 |  | 5,819
Ending balance: collectively evaluated for impaired |  |  | 2,016,712 |  | 1,755,282
Commercial, financial, agricultural and other [Member] |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Ending Balance |  |  | 27,552 |  | 34,701
Ending balance: individually evaluated for impaired |  |  | 9,045 |  | 2,466
Ending balance: collectively evaluated for impaired |  |  | 18,507 |  | 32,235
Total |  |  | 1,131,594 |  | 1,148,460
Ending balance: individually evaluated for impaired |  |  | 33,278 |  | 26,260
Ending balance: collectively evaluated for impaired |  |  | 1,098,316 |  | 1,122,200
Real estate construction [Member] |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Ending Balance |  |  | 1,114 |  | 614
Ending balance: individually evaluated for impaired |  |  | 0 |  | 0
Ending balance: collectively evaluated for impaired |  |  | 1,114 |  | 614
Total |  |  | 246,961 |  | 240,122
Ending balance: individually evaluated for impaired |  |  | 0 |  | 0
Ending balance: collectively evaluated for impaired |  |  | 246,961 |  | 240,122
Residential real estate [Member] |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Ending balance: individually evaluated for impaired |  |  | 287 |  | 175
Ending balance: collectively evaluated for impaired |  |  | 2,867 |  | 2,270
Ending balance: individually evaluated for impaired |  |  | 6,853 |  | 6,287
Ending balance: collectively evaluated for impaired |  |  | 1,427,770 |  | 1,211,111
Loans to individuals [Member] |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Ending Balance |  |  | 3,416 |  | 4,334
Ending balance: individually evaluated for impaired |  |  | 0 |  | 0
Ending balance: collectively evaluated for impaired |  |  | 3,416 |  | 4,334
Total |  |  | 541,055 |  | 540,880
Ending balance: individually evaluated for impaired |  |  | 0 |  | 0
Ending balance: collectively evaluated for impaired |  |  | 541,055 |  | 540,880
Acquired Loans [Member] |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning Balance | 46 | 19 |  |  |
Charge-offs | (20) | (15) |  |  |
Recoveries | 37 | 7 |  |  |
Provision for credit losses | (28) | 20 |  |  |
Ending Balance | 46 | 19 | 35 | 46 | 31
Total |  |  | 384,190 | 400,015 |
Acquired Loans [Member] | Residential real estate [Member] |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning Balance | 6 | 19 |  |  |
Charge-offs | (16) | (8) |  |  |
Recoveries | 17 | 6 |  |  |
Provision for credit losses | 6 | 14 |  |  |
Ending Balance | 6 | 19 | 13 | 6 | 31
Total |  |  | 213,634 | 220,251 |
Acquired Loans [Member] | Commercial Real Estate [Member] |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning Balance | 29 | 0 |  |  |
Charge-offs | 0 | 0 |  |  |
Recoveries | 0 | 0 |  |  |
Provision for credit losses | (27) | 0 |  |  |
Ending Balance | 29 | 0 | 2 | 29 | 0
Total |  |  | 125,463 | 126,911 |
Acquired Loans [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning Balance | 11 | 0 |  |  |
Charge-offs | 0 | 0 |  |  |
Recoveries | 7 | 0 |  |  |
Provision for credit losses | 2 | 0 |  |  |
Ending Balance | 11 | 0 | 20 | 11 | 0
Total |  |  | 38,402 | 40,642 |
Acquired Loans [Member] | Real estate construction [Member] |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning Balance | 0 | 0 |  |  |
Charge-offs | 0 | 0 |  |  |
Recoveries | 6 | 0 |  |  |
Provision for credit losses | (6) | 0 |  |  |
Ending Balance | 0 | 0 | 0 | 0 | 0
Total |  |  | 1,120 | 5,963 |
Acquired Loans [Member] | Loans to individuals [Member] |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning Balance | 0 | 0 |  |  |
Charge-offs | (4) | (7) |  |  |
Recoveries | 7 | 1 |  |  |
Provision for credit losses | (3) | 6 |  |  |
Ending Balance | 0 | 0 | 0 | 0 | 0
Total |  |  | 5,571 | 6,248 |
Originated Loans [Member] |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning Balance | 48,252 | 50,166 |  |  |
Charge-offs | (2,082) | (5,519) |  |  |
Recoveries | 596 | 789 |  |  |
Provision for credit losses | 6,931 | 3,209 |  |  |
Ending Balance | 48,252 | 50,166 | 53,697 | 48,252 | 48,645
Total |  |  | 4,997,115 | 5,007,361 |
Originated Loans [Member] | Residential real estate [Member] |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning Balance | 2,753 | 2,492 |  |  |
Charge-offs | (455) | (465) |  |  |
Recoveries | 75 | 122 |  |  |
Provision for credit losses | 768 | 265 |  |  |
Ending Balance | 2,753 | 2,492 | 3,141 | 2,753 | 2,414
Total |  |  | 1,220,989 | 1,206,119 |
Originated Loans [Member] | Commercial Real Estate [Member] |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning Balance | 17,328 | 6,619 |  |  |
Charge-offs | (168) | (31) |  |  |
Recoveries | 69 | 117 |  |  |
Provision for credit losses | 1,265 | (123) |  |  |
Ending Balance | 17,328 | 6,619 | 18,494 | 17,328 | 6,582
Total |  |  | 1,901,609 | 1,892,185 |
Originated Loans [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning Balance | 23,418 | 35,974 |  |  |
Charge-offs | (290) | (3,825) |  |  |
Recoveries | 256 | 368 |  |  |
Provision for credit losses | 4,148 | 2,184 |  |  |
Ending Balance | 23,418 | 35,974 | 27,532 | 23,418 | 34,701
Total |  |  | 1,093,192 | 1,122,741 |
Originated Loans [Member] | Real estate construction [Member] |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning Balance | 1,349 | 577 |  |  |
Charge-offs | 0 | 0 |  |  |
Recoveries | 1 | 54 |  |  |
Provision for credit losses | (236) | (17) |  |  |
Ending Balance | 1,349 | 577 | 1,114 | 1,349 | 614
Total |  |  | 245,841 | 242,905 |
Originated Loans [Member] | Loans to individuals [Member] |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |
Beginning Balance | 3,404 | 4,504 |  |  |
Charge-offs | (1,169) | (1,198) |  |  |
Recoveries | 195 | 128 |  |  |
Provision for credit losses | 986 | 900 |  |  |
Ending Balance | $ 3,404 | $ 4,504 | 3,416 | 3,404 | $ 4,334
Total |  |  | $ 535,484 | $ 543,411 |

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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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