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Allowance for Credit Losses, Credit Quality and Other - Summary of Aging Analysis for Loans Receivable (Detail) - USD ($) $ in Thousands | Dec. 31, 2023 | Dec. 31, 2022
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | $ 14,424,728 | $ 14,409,480
Accruing Loans Past Due 90 Days or More | 4,130 | 9,845
Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 18,559 | 21,490
Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 5,947 | 6,478
Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 64,101 | 60,856
Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 88,607 | 88,824
Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 14,336,121 | 14,320,656
Commercial real estate loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 8,168,157 | 8,114,140
Commercial real estate loans | Non-farm/non-residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 5,549,954 | 5,632,063
Accruing Loans Past Due 90 Days or More | 2,177 | 1,844
Commercial real estate loans | Non-farm/non-residential | Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 8,124 | 4,242
Commercial real estate loans | Non-farm/non-residential | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 416 | 2,117
Commercial real estate loans | Non-farm/non-residential | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 15,355 | 14,063
Commercial real estate loans | Non-farm/non-residential | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 23,895 | 20,422
Commercial real estate loans | Non-farm/non-residential | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 5,526,059 | 5,611,641
Commercial real estate loans | Construction/ Land Development |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 2,293,047 | 2,135,266
Accruing Loans Past Due 90 Days or More | 255 | 31
Commercial real estate loans | Construction/ Land Development | Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 1,430 | 4,042
Commercial real estate loans | Construction/ Land Development | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 0 | 1,892
Commercial real estate loans | Construction/ Land Development | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 12,349 | 2,008
Commercial real estate loans | Construction/ Land Development | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 13,779 | 7,942
Commercial real estate loans | Construction/ Land Development | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 2,279,268 | 2,127,324
Commercial real estate loans | Agricultural |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 325,156 | 346,811
Accruing Loans Past Due 90 Days or More | 0 | 0
Commercial real estate loans | Agricultural | Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 474 | 1,469
Commercial real estate loans | Agricultural | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 314 | 193
Commercial real estate loans | Agricultural | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 431 | 278
Commercial real estate loans | Agricultural | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 1,219 | 1,940
Commercial real estate loans | Agricultural | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 323,937 | 344,871
Residential Real Estate | Residential 1-4 family |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 1,844,260 | 1,748,551
Accruing Loans Past Due 90 Days or More | 84 | 1,374
Residential Real Estate | Residential 1-4 family | Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 4,346 | 6,715
Residential Real Estate | Residential 1-4 family | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 1,423 | 605
Residential Real Estate | Residential 1-4 family | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 20,435 | 19,457
Residential Real Estate | Residential 1-4 family | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 26,204 | 26,777
Residential Real Estate | Residential 1-4 family | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 1,818,056 | 1,721,774
Residential Real Estate | Multifamily residential |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 435,736 | 578,052
Accruing Loans Past Due 90 Days or More | 0 | 0
Residential Real Estate | Multifamily residential | Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 0 | 0
Residential Real Estate | Multifamily residential | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 0 | 0
Residential Real Estate | Multifamily residential | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 0 | 0
Residential Real Estate | Multifamily residential | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 0 | 0
Residential Real Estate | Multifamily residential | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 435,736 | 578,052
Total real estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 10,448,153 | 10,440,743
Accruing Loans Past Due 90 Days or More | 2,516 | 3,249
Total real estate | Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 14,374 | 16,468
Total real estate | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 2,153 | 4,807
Total real estate | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 48,570 | 35,806
Total real estate | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 65,097 | 57,081
Total real estate | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 10,383,056 | 10,383,662
Consumer |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 1,153,690 | 1,149,896
Accruing Loans Past Due 90 Days or More | 79 | 35
Consumer | Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 1,022 | 950
Consumer | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 303 | 539
Consumer | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 3,502 | 2,877
Consumer | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 4,827 | 4,366
Consumer | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 1,148,863 | 1,145,530
Commercial & Industrial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 2,324,991 | 2,349,263
Accruing Loans Past Due 90 Days or More | 1,535 | 6,300
Commercial & Industrial | Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 2,089 | 3,007
Commercial & Industrial | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 3,378 | 1,075
Commercial & Industrial | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 11,517 | 21,220
Commercial & Industrial | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 16,984 | 25,302
Commercial & Industrial | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 2,308,007 | 2,323,961
Agricultural & other |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 497,894 | 469,578
Accruing Loans Past Due 90 Days or More | 0 | 261
Agricultural & other | Loans Past Due 30-59 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 1,074 | 1,065
Agricultural & other | Loans Past Due 60-89 Days |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 113 | 57
Agricultural & other | Loans Past Due 90 Days or More |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 512 | 953
Agricultural & other | Total Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | 1,699 | 2,075
Agricultural & other | Current Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Loans receivable | $ 496,195 | $ 467,503

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- Definition Amortized cost excluding accrued interest, before allowance for credit loss, of financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 3B -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-3B Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-5 + Details
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