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Loans and Lease Finance Receivables and Allowance for Credit Losses - Additional Information (Detail) |  | 3 Months Ended | 12 Months Ended
--- | --- | --- | ---
Jan. 01, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 USD ($) Contract | Dec. 31, 2019 USD ($) Contract | Dec. 31, 2018 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) |  | 1.12% |  |  |  | 1.12% |  |
Secure borrowings and available lines of credit from FHLB and Federal Reserve Bank |  | $ 6,070,000,000.00 |  |  |  | $ 6,070,000,000.00 | $ 6,030,000,000.00 |
Loans held-for-sale |  | 0 |  |  |  | 0 | 0 |
Impaired, at carrying value |  | 2,200,000 |  |  |  | 2,200,000 | 8,389,000 | $ 23,545,000
Allowance for Credit Losses |  | 93,700,000 |  |  |  | 93,700,000 |  |
Reserve for credit risk for undisbursed commitments |  | 9,000,000.0 |  |  |  | 9,000,000.0 | 9,000,000.0 |
Increase in reserve for unfunded loan commitments | $ 41,000 |  |  |  |  | 0 | $ 0 | 250,000
Allowance For Credit Losses Increase Decrease |  | 177,000,000 |  |  |  | 25.0 |  |
Allowance For Credit Losses Write Offs |  | 177,000 |  |  |  |  |  |
Provision For Credit Losses |  | 0 |  |  |  | $ 23,500,000 |  |
Number of loans modified as a TDR within the previous 12 months that subsequently defaulted | Contract |  |  |  |  |  | 0 | 0 |
Allocation of allowance to troubled debt restructuring |  | $ 0 |  |  |  | $ 0 | $ 0 |
Transition adjustment, allowance for credit loses for loans | $ 1,800,000 |  |  |  |  | $ 1,800,000 |  |
Forecast [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Percentage of Increase Decrease In Macro Economic Factors |  |  |  | 3.60% |  |  |  |
GDP [Member] | Forecast [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Percentage of Increase Decrease In Macro Economic Factors |  |  | 3.60% |  | 2.50% |  |  |
Unemployment [Member] | Forecast [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Percentage of Increase Decrease In Macro Economic Factors |  |  | 5.70% | 7.20% | 7.70% |  |  |
Impact of ASU 2016-13 Adoption [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Increase in reserve for unfunded loan commitments |  |  |  |  |  |  |  | $ 250,000
Commercial Real Estate Loans [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) |  | 70.16% |  |  |  | 70.16% |  |
Notes receivable gross |  | $ 5,501,509,000 |  |  |  | $ 5,501,509,000 | 5,374,617,000 |
Construction [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) |  | 65.90% |  |  |  | 65.90% |  |
Performing Financing Receivable [Member] | Single-family Residential Loans [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans classified as troubled debt restructured |  | $ 1,800,000 |  |  |  | $ 1,800,000 |  |
Performing Financing Receivable [Member] | Commercial and Industrial [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans classified as troubled debt restructured |  | 43,000 |  |  |  | 43,000 |  |
Performing Financing Receivable [Member] | Commercial Real Estate [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Loans classified as troubled debt restructured |  | 320,000 |  |  |  | 320,000 |  |
Loans, Excluding PCI Loans [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Notes receivable gross |  | 361,100,000 |  |  |  | 361,100,000 |  |
Loans, Excluding PCI Loans [Member] | Dairy & Livestock Loans [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Notes receivable gross |  | 320,100,000 |  |  |  | 320,100,000 | 323,500,000 |
Loans, Excluding PCI Loans [Member] | Agribusiness Loans [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Notes receivable gross |  | $ 41,000,000.0 |  |  |  | $ 41,000,000.0 | $ 60,200,000 |
Loans, Excluding PCI Loans [Member] | Loans Secured by Farmland [Member] | Commercial Real Estate Loans [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) |  | 5.72% |  |  |  | 5.72% | 4.50% |
Notes receivable gross |  | $ 314,400,000 |  |  |  | $ 314,400,000 | $ 241,800,000 |
Loans, Excluding PCI Loans [Member] | Loans Secured by Farmland [Member] | Loans Secured by Dairy & Livestock Land [Member] | Commercial Real Estate Loans [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Notes receivable gross |  | 132,900,000 |  |  |  | 132,900,000 | 125,900,000 |
Loans, Excluding PCI Loans [Member] | Loans Secured by Farmland [Member] | Loans Secured by Agricultural Land [Member] | Commercial Real Estate Loans [Member] |  |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |  |
Notes receivable gross |  | $ 181,500,000 |  |  |  | $ 181,500,000 | $ 115,900,000 |

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