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Loans and Allowance for Credit Losses - Credit Risk Profile by Creditworthiness (Detail) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | $ 6,839,230 | $ 6,761,183
Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 6,641,104 | 6,458,370
Special Mention [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 120,563 | 226,634
Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 77,563 | 76,179
Doubtful [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Total Non-Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 198,126 | 302,813
Unlikely to be Collected Financing Receivable |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Commercial, financial, agricultural and other [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 1,173,452 | 1,555,986
Commercial, financial, agricultural and other [Member] | Commercial credit cards |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 13,928 | 14,604
Commercial, financial, agricultural and other [Member] | Time and demand loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 1,159,524 | 1,541,382
Commercial, financial, agricultural and other [Member] | Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 1,121,234 | 1,491,916
Commercial, financial, agricultural and other [Member] | Pass [Member] | Commercial credit cards |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 13,928 | 14,604
Commercial, financial, agricultural and other [Member] | Pass [Member] | Time and demand loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 1,107,306 | 1,477,312
Commercial, financial, agricultural and other [Member] | Special Mention [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 33,765 | 48,233
Commercial, financial, agricultural and other [Member] | Special Mention [Member] | Commercial credit cards |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Commercial, financial, agricultural and other [Member] | Special Mention [Member] | Time and demand loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 33,765 | 48,233
Commercial, financial, agricultural and other [Member] | Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 18,453 | 15,837
Commercial, financial, agricultural and other [Member] | Substandard [Member] | Commercial credit cards |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Commercial, financial, agricultural and other [Member] | Substandard [Member] | Time and demand loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 18,453 | 15,837
Commercial, financial, agricultural and other [Member] | Doubtful [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Commercial, financial, agricultural and other [Member] | Doubtful [Member] | Commercial credit cards |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Commercial, financial, agricultural and other [Member] | Doubtful [Member] | Time and demand loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Commercial, financial, agricultural and other [Member] | Total Non-Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 52,218 | 64,070
Commercial, financial, agricultural and other [Member] | Total Non-Pass [Member] | Commercial credit cards |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Commercial, financial, agricultural and other [Member] | Total Non-Pass [Member] | Time and demand loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 52,218 | 64,070
Commercial, financial, agricultural and other [Member] | Unlikely to be Collected Financing Receivable |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Commercial, financial, agricultural and other [Member] | Unlikely to be Collected Financing Receivable | Commercial credit cards |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Commercial, financial, agricultural and other [Member] | Unlikely to be Collected Financing Receivable | Time and demand loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Real Estate Construction [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 494,456 | 427,221
Real Estate Construction [Member] | Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 493,913 | 426,663
Real Estate Construction [Member] | Special Mention [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 498 | 504
Real Estate Construction [Member] | Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 45 | 54
Real Estate Construction [Member] | Doubtful [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Real Estate Construction [Member] | Total Non-Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 543 | 558
Real Estate Construction [Member] | Unlikely to be Collected Financing Receivable |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Residential Real Estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 1,920,250 | 1,750,592
Residential Real Estate [Member] | Senior Lien |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 1,299,534 | 1,144,323
Residential Real Estate [Member] | Junior Lien |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 620,716 | 606,269
Residential Real Estate [Member] | Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 1,913,064 | 1,740,992
Residential Real Estate [Member] | Pass [Member] | Senior Lien |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 1,295,524 | 1,138,409
Residential Real Estate [Member] | Pass [Member] | Junior Lien |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 617,540 | 602,583
Residential Real Estate [Member] | Special Mention [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 976 | 1,902
Residential Real Estate [Member] | Special Mention [Member] | Senior Lien |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 905 | 1,780
Residential Real Estate [Member] | Special Mention [Member] | Junior Lien |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 71 | 122
Residential Real Estate [Member] | Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 6,210 | 7,698
Residential Real Estate [Member] | Substandard [Member] | Senior Lien |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 3,105 | 4,134
Residential Real Estate [Member] | Substandard [Member] | Junior Lien |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 3,105 | 3,564
Residential Real Estate [Member] | Doubtful [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Residential Real Estate [Member] | Doubtful [Member] | Senior Lien |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Residential Real Estate [Member] | Doubtful [Member] | Junior Lien |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Residential Real Estate [Member] | Total Non-Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 7,186 | 9,600
Residential Real Estate [Member] | Total Non-Pass [Member] | Senior Lien |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 4,010 | 5,914
Residential Real Estate [Member] | Total Non-Pass [Member] | Junior Lien |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 3,176 | 3,686
Residential Real Estate [Member] | Unlikely to be Collected Financing Receivable |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Residential Real Estate [Member] | Unlikely to be Collected Financing Receivable | Senior Lien |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Residential Real Estate [Member] | Unlikely to be Collected Financing Receivable | Junior Lien |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Commercial real estate [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 2,251,097 | 2,211,569
Commercial real estate [Member] | Multifamily |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 385,432 | 371,239
Commercial real estate [Member] | Nonowner Occupied Commercial Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 1,465,247 | 1,421,151
Commercial real estate [Member] | Owner Occupied Commercial Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 400,418 | 419,179
Commercial real estate [Member] | Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 2,113,123 | 1,983,258
Commercial real estate [Member] | Pass [Member] | Multifamily |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 355,702 | 369,883
Commercial real estate [Member] | Pass [Member] | Nonowner Occupied Commercial Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 1,368,922 | 1,216,252
Commercial real estate [Member] | Pass [Member] | Owner Occupied Commercial Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 388,499 | 397,123
Commercial real estate [Member] | Special Mention [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 85,324 | 175,995
Commercial real estate [Member] | Special Mention [Member] | Multifamily |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 14,565 | 131
Commercial real estate [Member] | Special Mention [Member] | Nonowner Occupied Commercial Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 63,783 | 161,336
Commercial real estate [Member] | Special Mention [Member] | Owner Occupied Commercial Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 6,976 | 14,528
Commercial real estate [Member] | Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 52,650 | 52,316
Commercial real estate [Member] | Substandard [Member] | Multifamily |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 15,165 | 1,225
Commercial real estate [Member] | Substandard [Member] | Nonowner Occupied Commercial Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 32,542 | 43,563
Commercial real estate [Member] | Substandard [Member] | Owner Occupied Commercial Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 4,943 | 7,528
Commercial real estate [Member] | Doubtful [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Commercial real estate [Member] | Doubtful [Member] | Multifamily |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Commercial real estate [Member] | Doubtful [Member] | Nonowner Occupied Commercial Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Commercial real estate [Member] | Doubtful [Member] | Owner Occupied Commercial Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Commercial real estate [Member] | Total Non-Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 137,974 | 228,311
Commercial real estate [Member] | Total Non-Pass [Member] | Multifamily |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 29,730 | 1,356
Commercial real estate [Member] | Total Non-Pass [Member] | Nonowner Occupied Commercial Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 96,325 | 204,899
Commercial real estate [Member] | Total Non-Pass [Member] | Owner Occupied Commercial Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 11,919 | 22,056
Commercial real estate [Member] | Unlikely to be Collected Financing Receivable |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Commercial real estate [Member] | Unlikely to be Collected Financing Receivable | Multifamily |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Commercial real estate [Member] | Unlikely to be Collected Financing Receivable | Nonowner Occupied Commercial Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Commercial real estate [Member] | Unlikely to be Collected Financing Receivable | Owner Occupied Commercial Real Estate |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Loans To Individuals [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 999,975 | 815,815
Loans To Individuals [Member] | Automobile Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 901,280 | 712,800
Loans To Individuals [Member] | Consumer Credit Cards |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 11,151 | 12,360
Loans To Individuals [Member] | Other consumer loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 87,544 | 90,655
Loans To Individuals [Member] | Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 999,770 | 815,541
Loans To Individuals [Member] | Pass [Member] | Automobile Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 901,132 | 712,539
Loans To Individuals [Member] | Pass [Member] | Consumer Credit Cards |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 11,151 | 12,360
Loans To Individuals [Member] | Pass [Member] | Other consumer loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 87,487 | 90,642
Loans To Individuals [Member] | Special Mention [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Loans To Individuals [Member] | Special Mention [Member] | Automobile Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Loans To Individuals [Member] | Special Mention [Member] | Consumer Credit Cards |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Loans To Individuals [Member] | Special Mention [Member] | Other consumer loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Loans To Individuals [Member] | Substandard [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 205 | 274
Loans To Individuals [Member] | Substandard [Member] | Automobile Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 148 | 261
Loans To Individuals [Member] | Substandard [Member] | Consumer Credit Cards |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Loans To Individuals [Member] | Substandard [Member] | Other consumer loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 57 | 13
Loans To Individuals [Member] | Doubtful [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Loans To Individuals [Member] | Doubtful [Member] | Automobile Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Loans To Individuals [Member] | Doubtful [Member] | Consumer Credit Cards |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Loans To Individuals [Member] | Doubtful [Member] | Other consumer loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Loans To Individuals [Member] | Total Non-Pass [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 205 | 274
Loans To Individuals [Member] | Total Non-Pass [Member] | Automobile Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 148 | 261
Loans To Individuals [Member] | Total Non-Pass [Member] | Consumer Credit Cards |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Loans To Individuals [Member] | Total Non-Pass [Member] | Other consumer loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 57 | 13
Loans To Individuals [Member] | Unlikely to be Collected Financing Receivable |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Loans To Individuals [Member] | Unlikely to be Collected Financing Receivable | Automobile Loan |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Loans To Individuals [Member] | Unlikely to be Collected Financing Receivable | Consumer Credit Cards |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | 0 | 0
Loans To Individuals [Member] | Unlikely to be Collected Financing Receivable | Other consumer loans |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Loans and Leases Receivable, Gross | $ 0 | $ 0

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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522 + Details
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