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Loans and Allowance for Credit Losses - Allowance for Credit Losses (Detail) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | $ 47,764 | $ 48,298 |
Charge-offs | (12,300) | (15,100) |
Provision for credit losses | 14,533 | 12,531 | $ 5,087
Ending Balance | 51,637 | 47,764 | 48,298
Ending balance: individually evaluated for impaired | 2,432 | 1,631 | 3,746
Ending balance: collectively evaluated for impaired | 49,205 | 46,133 | 44,552
Ending balance | 6,189,148 | 5,774,139 | 5,407,376
Ending balance: individually evaluated for impaired | 17,833 | 21,088 | 35,151
Ending balance: collectively evaluated for impaired | 6,171,315 | 5,753,051 | 5,372,225
Commercial, financial, agricultural and other [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | 19,374 | 23,429 |
Ending Balance | 20,234 | 19,374 | 23,429
Ending balance: individually evaluated for impaired | 1,580 | 928 | 3,478
Ending balance: collectively evaluated for impaired | 18,654 | 18,446 | 19,951
Ending balance | 1,241,853 | 1,138,473 | 1,163,383
Ending balance: individually evaluated for impaired | 9,246 | 11,631 | 22,450
Ending balance: collectively evaluated for impaired | 1,232,607 | 1,126,842 | 1,140,933
Real Estate Construction [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | 2,002 | 1,349 |
Ending Balance | 2,558 | 2,002 | 1,349
Ending balance: individually evaluated for impaired | 0 | 0 | 0
Ending balance: collectively evaluated for impaired | 2,558 | 2,002 | 1,349
Ending balance | 449,039 | 358,978 | 248,868
Ending balance: individually evaluated for impaired | 0 | 0 | 0
Ending balance: collectively evaluated for impaired | 449,039 | 358,978 | 248,868
Residential Real Estate [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | 3,969 | 2,759 |
Ending Balance | 4,093 | 3,969 | 2,759
Ending balance: individually evaluated for impaired | 1 | 107 | 111
Ending balance: collectively evaluated for impaired | 4,092 | 3,862 | 2,648
Ending balance | 1,681,362 | 1,562,405 | 1,426,370
Ending balance: individually evaluated for impaired | 1,741 | 3,747 | 6,698
Ending balance: collectively evaluated for impaired | 1,679,621 | 1,558,658 | 1,419,672
Commercial real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | 18,386 | 17,357 |
Ending Balance | 19,768 | 18,386 | 17,357
Ending balance: individually evaluated for impaired | 851 | 596 | 157
Ending balance: collectively evaluated for impaired | 18,917 | 17,790 | 17,200
Ending balance | 2,117,519 | 2,123,544 | 2,019,096
Ending balance: individually evaluated for impaired | 6,846 | 5,710 | 6,003
Ending balance: collectively evaluated for impaired | 2,110,673 | 2,117,834 | 2,013,093
Loans To Individuals [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | 4,033 | 3,404 |
Ending Balance | 4,984 | 4,033 | 3,404
Ending balance: individually evaluated for impaired | 0 | 0 | 0
Ending balance: collectively evaluated for impaired | 4,984 | 4,033 | 3,404
Ending balance | 699,375 | 590,739 | 549,659
Ending balance: individually evaluated for impaired | 0 | 0 | 0
Ending balance: collectively evaluated for impaired | 699,375 | 590,739 | 549,659
Originated Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | 47,586 | 48,252 | 50,166
Charge-offs | (10,032) | (14,902) | (11,997)
Recoveries | 1,449 | 1,846 | 5,403
Provision for credit losses | 12,582 | 12,390 | 4,680
Ending Balance | 51,585 | 47,586 | 48,252
Ending balance | 5,714,373 | 5,275,296 |
Originated Loans [Member] | Commercial, financial, agricultural and other [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | 19,235 | 23,418 | 35,974
Charge-offs | (2,667) | (5,201) | (6,176)
Recoveries | 245 | 746 | 3,900
Provision for credit losses | 3,408 | 272 | (10,280)
Ending Balance | 20,221 | 19,235 | 23,418
Ending balance | 1,212,026 | 1,100,947 |
Originated Loans [Member] | Real Estate Construction [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | 2,002 | 1,349 | 577
Charge-offs | 0 | 0 | 0
Recoveries | 158 | 135 | 465
Provision for credit losses | 398 | 518 | 307
Ending Balance | 2,558 | 2,002 | 1,349
Ending balance | 442,777 | 353,008 |
Originated Loans [Member] | Residential Real Estate [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | 3,934 | 2,753 | 2,492
Charge-offs | (986) | (1,217) | (1,261)
Recoveries | 246 | 233 | 304
Provision for credit losses | 897 | 2,165 | 1,218
Ending Balance | 4,091 | 3,934 | 2,753
Ending balance | 1,415,808 | 1,313,645 |
Originated Loans [Member] | Commercial real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | 18,382 | 17,328 | 6,619
Charge-offs | (632) | (3,930) | (340)
Recoveries | 189 | 153 | 274
Provision for credit losses | 1,792 | 4,831 | 10,775
Ending Balance | 19,731 | 18,382 | 17,328
Ending balance | 1,958,346 | 1,922,349 |
Originated Loans [Member] | Loans To Individuals [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | 4,033 | 3,404 | 4,504
Charge-offs | (5,747) | (4,554) | (4,220)
Recoveries | 611 | 579 | 460
Provision for credit losses | 6,087 | 4,604 | 2,660
Ending Balance | 4,984 | 4,033 | 3,404
Ending balance | 685,416 | 585,347 |
Acquired Loans [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | 178 | 46 | 19
Charge-offs | (2,242) | (211) | (512)
Recoveries | 165 | 202 | 132
Provision for credit losses | 1,951 | 141 | 407
Ending Balance | 52 | 178 | 46
Ending balance | 474,775 | 498,843 |
Acquired Loans [Member] | Commercial, financial, agricultural and other [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | 139 | 11 | 0
Charge-offs | (726) | (93) | (458)
Recoveries | 81 | 42 | 1
Provision for credit losses | 519 | 179 | 468
Ending Balance | 13 | 139 | 11
Ending balance | 29,827 | 37,526 |
Acquired Loans [Member] | Real Estate Construction [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | 0 | 0 | 0
Charge-offs | 0 | 0 | 0
Recoveries | 0 | 6 | 5
Provision for credit losses | 0 | (6) | (5)
Ending Balance | 0 | 0 | 0
Ending balance | 6,262 | 5,970 |
Acquired Loans [Member] | Residential Real Estate [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | 35 | 6 | 19
Charge-offs | (56) | (96) | (26)
Recoveries | 69 | 128 | 67
Provision for credit losses | (46) | (3) | (54)
Ending Balance | 2 | 35 | 6
Ending balance | 265,554 | 248,760 |
Acquired Loans [Member] | Commercial real estate [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | 4 | 29 | 0
Charge-offs | (1,376) | 0 | 0
Recoveries | 0 | 0 | 4
Provision for credit losses | 1,409 | (25) | 25
Ending Balance | 37 | 4 | 29
Ending balance | 159,173 | 201,195 |
Acquired Loans [Member] | Loans To Individuals [Member] |  |  |
Financing Receivable, Allowance for Credit Loss [Roll Forward] |  |  |
Beginning Balance | 0 | 0 | 0
Charge-offs | (84) | (22) | (28)
Recoveries | 15 | 26 | 55
Provision for credit losses | 69 | (4) | (27)
Ending Balance | 0 | 0 | $ 0
Ending balance | $ 13,959 | $ 5,392 |

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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=118936363&loc=SL6953423-111524 Reference 2: 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=118955202&loc=SL82895884-210446 Reference 3: 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=119407570&loc=SL82919249-210447 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 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=119407570&loc=SL82919249-210447 + 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118936363&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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=118936363&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/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=118955255&loc=SL82922352-210448 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(4) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 + Details
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- Definition Amount of writeoff of financing receivable, charged against allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=119407570&loc=SL82919249-210447 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=118936363&loc=SL6953423-111524 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 55 -Paragraph 79 -URI http://asc.fasb.org/extlink&oid=118955255&loc=SL82922352-210448 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(7)(d)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 + Details
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