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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, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |  |
Provision for credit losses | $ 1,168 | $ (1,609) | $ 8,071 | $ 1,620 |  |  |
Ending Balance |  |  |  |  | $ 51,314 |  | $ 48,067
Ending balance: individually evaluated for impaired |  |  |  |  | 7,601 |  | 2,135
Ending balance: collectively evaluated for impaired |  |  |  |  | 43,713 |  | 45,932
Total |  |  |  |  | 5,640,106 | $ 5,407,376 | 5,374,782
Ending balance: individually evaluated for impaired |  |  |  |  | 35,299 |  | 32,592
Ending balance: collectively evaluated for impaired |  |  |  |  | 5,604,807 |  | 5,342,190
Residential real estate [Member] |  |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |  |
Ending Balance |  |  |  |  | 3,683 |  | 2,120
Total |  |  |  |  | 1,518,850 |  | 1,416,926
Commercial Real Estate [Member] |  |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |  |
Ending Balance |  |  |  |  | 17,737 |  | 7,357
Ending balance: individually evaluated for impaired |  |  |  |  | 662 |  | 309
Ending balance: collectively evaluated for impaired |  |  |  |  | 17,075 |  | 7,048
Total |  |  |  |  | 2,172,615 |  | 1,963,001
Ending balance: individually evaluated for impaired |  |  |  |  | 9,037 |  | 8,697
Ending balance: collectively evaluated for impaired |  |  |  |  | 2,163,578 |  | 1,954,304
Commercial, financial, agricultural and other [Member] |  |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |  |
Ending Balance |  |  |  |  | 25,105 |  | 33,490
Ending balance: individually evaluated for impaired |  |  |  |  | 6,597 |  | 1,791
Ending balance: collectively evaluated for impaired |  |  |  |  | 18,508 |  | 31,699
Total |  |  |  |  | 1,130,638 |  | 1,199,800
Ending balance: individually evaluated for impaired |  |  |  |  | 21,087 |  | 16,917
Ending balance: collectively evaluated for impaired |  |  |  |  | 1,109,551 |  | 1,182,883
Real estate construction [Member] |  |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |  |
Ending Balance |  |  |  |  | 1,262 |  | 768
Ending balance: individually evaluated for impaired |  |  |  |  | 0 |  | 0
Ending balance: collectively evaluated for impaired |  |  |  |  | 1,262 |  | 768
Total |  |  |  |  | 259,825 |  | 249,255
Ending balance: individually evaluated for impaired |  |  |  |  | 0 |  | 0
Ending balance: collectively evaluated for impaired |  |  |  |  | 259,825 |  | 249,255
Residential real estate [Member] |  |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |  |
Ending balance: individually evaluated for impaired |  |  |  |  | 342 |  | 35
Ending balance: collectively evaluated for impaired |  |  |  |  | 3,341 |  | 2,085
Ending balance: individually evaluated for impaired |  |  |  |  | 5,175 |  | 6,978
Ending balance: collectively evaluated for impaired |  |  |  |  | 1,513,675 |  | 1,409,948
Loans to individuals [Member] |  |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |  |
Ending Balance |  |  |  |  | 3,527 |  | 4,332
Ending balance: individually evaluated for impaired |  |  |  |  | 0 |  | 0
Ending balance: collectively evaluated for impaired |  |  |  |  | 3,527 |  | 4,332
Total |  |  |  |  | 558,178 |  | 545,800
Ending balance: individually evaluated for impaired |  |  |  |  | 0 |  | 0
Ending balance: collectively evaluated for impaired |  |  |  |  | 558,178 |  | 545,800
Acquired Loans [Member] |  |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 35 | 31 | 46 | 19 |  |  |
Charge-offs | (132) | (2) | (152) | (17) |  |  |
Recoveries | 49 | 71 | 86 | 78 |  |  |
Provision for credit losses | 204 | 72 | 176 | 92 |  |  |
Ending Balance | 35 | 31 | 46 | 19 | 156 | 46 | 172
Total |  |  |  |  | 550,049 | 400,015 |
Acquired Loans [Member] | Residential real estate [Member] |  |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 13 | 31 | 6 | 19 |  |  |
Charge-offs | (32) | (1) | (48) | (9) |  |  |
Recoveries | 33 | 21 | 50 | 27 |  |  |
Provision for credit losses | 113 | (47) | 119 | (33) |  |  |
Ending Balance | 13 | 31 | 6 | 19 | 127 | 6 | 4
Total |  |  |  |  | 267,497 | 220,251 |
Acquired Loans [Member] | Commercial Real Estate [Member] |  |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 2 | 0 | 29 | 0 |  |  |
Charge-offs | 0 | 0 | 0 | 0 |  |  |
Recoveries | 0 | 4 | 0 | 4 |  |  |
Provision for credit losses | 4 | 46 | (23) | 46 |  |  |
Ending Balance | 2 | 0 | 29 | 0 | 6 | 29 | 50
Total |  |  |  |  | 224,328 | 126,911 |
Acquired Loans [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 20 | 0 | 11 | 0 |  |  |
Charge-offs | (93) | 0 | (93) | 0 |  |  |
Recoveries | 11 | 0 | 18 | 0 |  |  |
Provision for credit losses | 85 | 118 | 87 | 118 |  |  |
Ending Balance | 20 | 0 | 11 | 0 | 23 | 11 | 118
Total |  |  |  |  | 42,563 | 40,642 |
Acquired Loans [Member] | Real estate construction [Member] |  |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 0 | 0 | 0 | 0 |  |  |
Charge-offs | 0 | 0 | 0 | 0 |  |  |
Recoveries | 0 | 1 | 6 | 1 |  |  |
Provision for credit losses | 0 | (1) | (6) | (1) |  |  |
Ending Balance | 0 | 0 | 0 | 0 | 0 | 0 | 0
Total |  |  |  |  | 9,130 | 5,963 |
Acquired Loans [Member] | Loans to individuals [Member] |  |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 0 | 0 | 0 | 0 |  |  |
Charge-offs | (7) | (1) | (11) | (8) |  |  |
Recoveries | 5 | 45 | 12 | 46 |  |  |
Provision for credit losses | 2 | (44) | (1) | (38) |  |  |
Ending Balance | 0 | 0 | 0 | 0 | 0 | 0 | 0
Total |  |  |  |  | 6,531 | 6,248 |
Originated Loans [Member] |  |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 53,697 | 48,645 | 48,252 | 50,166 |  |  |
Charge-offs | (4,116) | (2,598) | (6,198) | (8,117) |  |  |
Recoveries | 613 | 3,529 | 1,209 | 4,318 |  |  |
Provision for credit losses | 964 | (1,681) | 7,895 | 1,528 |  |  |
Ending Balance | 53,697 | 48,645 | 48,252 | 50,166 | 51,158 | 48,252 | 47,895
Total |  |  |  |  | 5,090,057 | 5,007,361 |
Originated Loans [Member] | Residential real estate [Member] |  |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 3,141 | 2,414 | 2,753 | 2,492 |  |  |
Charge-offs | (226) | (145) | (681) | (610) |  |  |
Recoveries | 121 | 70 | 196 | 192 |  |  |
Provision for credit losses | 520 | (223) | 1,288 | 42 |  |  |
Ending Balance | 3,141 | 2,414 | 2,753 | 2,492 | 3,556 | 2,753 | 2,116
Total |  |  |  |  | 1,251,353 | 1,206,119 |
Originated Loans [Member] | Commercial Real Estate [Member] |  |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 18,494 | 6,582 | 17,328 | 6,619 |  |  |
Charge-offs | (2,243) | (29) | (2,411) | (60) |  |  |
Recoveries | 18 | 29 | 87 | 146 |  |  |
Provision for credit losses | 1,462 | 725 | 2,727 | 602 |  |  |
Ending Balance | 18,494 | 6,582 | 17,328 | 6,619 | 17,731 | 17,328 | 7,307
Total |  |  |  |  | 1,948,287 | 1,892,185 |
Originated Loans [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 27,532 | 34,701 | 23,418 | 35,974 |  |  |
Charge-offs | (571) | (1,452) | (861) | (5,277) |  |  |
Recoveries | 362 | 3,268 | 618 | 3,636 |  |  |
Provision for credit losses | (2,241) | (3,145) | 1,907 | (961) |  |  |
Ending Balance | 27,532 | 34,701 | 23,418 | 35,974 | 25,082 | 23,418 | 33,372
Total |  |  |  |  | 1,088,075 | 1,122,741 |
Originated Loans [Member] | Real estate construction [Member] |  |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 1,114 | 614 | 1,349 | 577 |  |  |
Charge-offs | 0 | 0 | 0 | 0 |  |  |
Recoveries | 0 | 42 | 1 | 96 |  |  |
Provision for credit losses | 148 | 112 | (88) | 95 |  |  |
Ending Balance | 1,114 | 614 | 1,349 | 577 | 1,262 | 1,349 | 768
Total |  |  |  |  | 250,695 | 242,905 |
Originated Loans [Member] | Loans to individuals [Member] |  |  |  |  |  |  |
Allowance for Doubtful Accounts Receivable [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 3,416 | 4,334 | 3,404 | 4,504 |  |  |
Charge-offs | (1,076) | (972) | (2,245) | (2,170) |  |  |
Recoveries | 112 | 120 | 307 | 248 |  |  |
Provision for credit losses | 1,075 | 850 | 2,061 | 1,750 |  |  |
Ending Balance | $ 3,416 | $ 4,334 | $ 3,404 | $ 4,504 | 3,527 | 3,404 | $ 4,332
Total |  |  |  |  | $ 551,647 | $ 543,411 |

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