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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, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 30, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Provision for credit losses | $ (6,859) | $ (2,835) | $ (37,826) | $ (6,930) |  |  |
Ending Balance |  |  |  |  | $ 81,441 |  | $ 51,061
Ending balance: individually evaluated for impaired |  |  |  |  | 6,895 |  | 2,530
Ending balance: collectively evaluated for impaired |  |  |  |  | 74,546 |  | 48,531
Total |  |  |  |  | 6,922,075 | $ 6,189,148 | 6,003,059
Ending balance: individually evaluated for impaired |  |  |  |  | 37,679 |  | 25,487
Ending balance: collectively evaluated for impaired |  |  |  |  | 6,884,396 |  | 5,977,572
Residential real estate [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Ending Balance |  |  |  |  | 9,239 |  | 4,158
Ending balance: individually evaluated for impaired |  |  |  |  |  |  | 87
Ending balance: collectively evaluated for impaired |  |  |  |  |  |  | 4,071
Total |  |  |  |  | 1,723,288 |  | 1,579,441
Ending balance: individually evaluated for impaired |  |  |  |  |  |  | 4,065
Ending balance: collectively evaluated for impaired |  |  |  |  |  |  | 1,575,376
Commercial Real Estate [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Ending Balance |  |  |  |  | 34,486 |  | 19,312
Ending balance: individually evaluated for impaired |  |  |  |  | 5,766 |  | 1,113
Ending balance: collectively evaluated for impaired |  |  |  |  | 28,720 |  | 18,199
Total |  |  |  |  | 2,224,710 |  | 2,118,582
Ending balance: individually evaluated for impaired |  |  |  |  | 32,537 |  | 10,216
Ending balance: collectively evaluated for impaired |  |  |  |  | 2,192,173 |  | 2,108,366
Commercial, financial, agricultural and other [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Ending Balance |  |  |  |  | 25,144 |  | 20,693
Ending balance: individually evaluated for impaired |  |  |  |  | 958 |  | 1,330
Ending balance: collectively evaluated for impaired |  |  |  |  | 24,186 |  | 19,363
Total |  |  |  |  | 1,773,099 |  | 1,236,424
Ending balance: individually evaluated for impaired |  |  |  |  | 3,336 |  | 11,206
Ending balance: collectively evaluated for impaired |  |  |  |  | 1,769,763 |  | 1,225,218
Real estate construction [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Ending Balance |  |  |  |  | 3,238 |  | 2,491
Ending balance: individually evaluated for impaired |  |  |  |  | 171 |  | 0
Ending balance: collectively evaluated for impaired |  |  |  |  | 3,067 |  | 2,491
Total |  |  |  |  | 416,329 |  | 441,854
Ending balance: individually evaluated for impaired |  |  |  |  | 308 |  | 0
Ending balance: collectively evaluated for impaired |  |  |  |  | 416,021 |  | 441,854
Residential real estate [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Ending balance: individually evaluated for impaired |  |  |  |  | 0 |  |
Ending balance: collectively evaluated for impaired |  |  |  |  | 9,239 |  |
Ending balance: individually evaluated for impaired |  |  |  |  | 1,498 |  |
Ending balance: collectively evaluated for impaired |  |  |  |  | 1,721,790 |  |
Loans to individuals [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Ending Balance |  |  |  |  | 9,334 |  | 4,407
Ending balance: individually evaluated for impaired |  |  |  |  | 0 |  | 0
Ending balance: collectively evaluated for impaired |  |  |  |  | 9,334 |  | 4,407
Total |  |  |  |  | 784,649 |  | 626,758
Ending balance: individually evaluated for impaired |  |  |  |  | 0 |  | 0
Ending balance: collectively evaluated for impaired |  |  |  |  | 784,649 |  | 626,758
Acquired Loans [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 1,588 | 53 | 52 | 178 |  |  |
Charge-offs | (138) | (28) | (300) | (604) |  |  |
Recoveries | 15 | 37 | 48 | 81 |  |  |
Provision for credit losses | (394) | (3) | (2,059) | (410) |  |  |
Ending Balance | 1,588 | 53 | 52 | 178 | 1,859 | 52 | 65
Total |  |  |  |  | 404,125 | 474,775 |
Acquired Loans [Member] | Residential real estate [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 0 | 35 | 2 | 35 |  |  |
Charge-offs | (66) | (1) | (91) | (46) |  |  |
Recoveries | 12 | 11 | 25 | 35 |  |  |
Provision for credit losses | (54) | 20 | (64) | (1) |  |  |
Ending Balance | 0 | 35 | 2 | 35 | 0 | 2 | 25
Total |  |  |  |  | 228,363 | 265,554 |
Acquired Loans [Member] | Commercial Real Estate [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 1,238 | 0 | 37 | 4 |  |  |
Charge-offs | (1) | 0 | (2) | 0 |  |  |
Recoveries | 0 | 0 | 0 | 0 |  |  |
Provision for credit losses | (119) | (25) | (1,321) | (21) |  |  |
Ending Balance | 1,238 | 0 | 37 | 4 | 1,356 | 37 | 25
Total |  |  |  |  | 135,052 | 159,173 |
Acquired Loans [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 350 | 18 | 13 | 139 |  |  |
Charge-offs | 0 | (26) | 0 | (552) |  |  |
Recoveries | 2 | 21 | 15 | 32 |  |  |
Provision for credit losses | 20 | (2) | (304) | (396) |  |  |
Ending Balance | 350 | 18 | 13 | 139 | 332 | 13 | 15
Total |  |  |  |  | 26,604 | 29,827 |
Acquired Loans [Member] | Real estate construction [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 0 | 0 | 0 | 0 |  |  |
Charge-offs | 0 | 0 | 0 | 0 |  |  |
Recoveries | 0 | 0 | 0 | 0 |  |  |
Provision for credit losses | (171) | 0 | (171) | 0 |  |  |
Ending Balance | 0 | 0 | 0 | 0 | 171 | 0 | 0
Total |  |  |  |  | 2,924 | 6,262 |
Acquired Loans [Member] | Loans to individuals [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 0 | 0 | 0 | 0 |  |  |
Charge-offs | (71) | (1) | (207) | (6) |  |  |
Recoveries | 1 | 5 | 8 | 14 |  |  |
Provision for credit losses | (70) | 4 | (199) | 8 |  |  |
Ending Balance | 0 | 0 | 0 | 0 | 0 | 0 | 0
Total |  |  |  |  | 11,182 | 13,959 |
Originated Loans [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 77,487 | 49,600 | 51,585 | 47,586 |  |  |
Charge-offs | (4,768) | (1,825) | (8,554) | (3,853) |  |  |
Recoveries | 398 | 389 | 784 | 743 |  |  |
Provision for credit losses | (6,465) | (2,832) | (35,767) | (6,520) |  |  |
Ending Balance | 77,487 | 49,600 | 51,585 | 47,586 | 79,582 | 51,585 | 50,996
Total |  |  |  |  | 6,517,950 | 5,714,373 |
Originated Loans [Member] | Residential real estate [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 7,724 | 4,150 | 4,091 | 3,934 |  |  |
Charge-offs | (7) | (98) | (559) | (234) |  |  |
Recoveries | 59 | 103 | 121 | 184 |  |  |
Provision for credit losses | (1,463) | 22 | (5,586) | (249) |  |  |
Ending Balance | 7,724 | 4,150 | 4,091 | 3,934 | 9,239 | 4,091 | 4,133
Total |  |  |  |  | 1,494,925 | 1,415,808 |
Originated Loans [Member] | Commercial Real Estate [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 31,265 | 19,218 | 19,731 | 18,382 |  |  |
Charge-offs | (2,150) | 0 | (2,415) | (299) |  |  |
Recoveries | 0 | 38 | 44 | 79 |  |  |
Provision for credit losses | (4,015) | (31) | (15,770) | (1,125) |  |  |
Ending Balance | 31,265 | 19,218 | 19,731 | 18,382 | 33,130 | 19,731 | 19,287
Total |  |  |  |  | 2,089,658 | 1,958,346 |
Originated Loans [Member] | Commercial, financial, agricultural and other [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 27,378 | 19,815 | 20,221 | 19,235 |  |  |
Charge-offs | (1,285) | (359) | (1,771) | (842) |  |  |
Recoveries | 49 | 63 | 117 | 139 |  |  |
Provision for credit losses | 1,330 | (1,159) | (6,245) | (2,146) |  |  |
Ending Balance | 27,378 | 19,815 | 20,221 | 19,235 | 24,812 | 20,221 | 20,678
Total |  |  |  |  | 1,746,495 | 1,212,026 |
Originated Loans [Member] | Real estate construction [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 2,852 | 2,254 | 2,558 | 2,002 |  |  |
Charge-offs | 0 | 0 | 0 | 0 |  |  |
Recoveries | 26 | 42 | 26 | 84 |  |  |
Provision for credit losses | (189) | (195) | (483) | (405) |  |  |
Ending Balance | 2,852 | 2,254 | 2,558 | 2,002 | 3,067 | 2,558 | 2,491
Total |  |  |  |  | 413,405 | 442,777 |
Originated Loans [Member] | Loans to individuals [Member] |  |  |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss [Roll Forward] |  |  |  |  |  |  |
Beginning Balance | 8,268 | 4,163 | 4,984 | 4,033 |  |  |
Charge-offs | (1,326) | (1,368) | (3,809) | (2,478) |  |  |
Recoveries | 264 | 143 | 476 | 257 |  |  |
Provision for credit losses | (2,128) | (1,469) | (7,683) | (2,595) |  |  |
Ending Balance | $ 8,268 | $ 4,163 | $ 4,984 | $ 4,033 | 9,334 | 4,984 | $ 4,407
Total |  |  |  |  | $ 773,467 | $ 685,416 |

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- Definition Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953423-111524 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(2)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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