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Loans and Lease Finance Receivables and Allowance for Loan Losses - Additional Information (Detail) |  | 3 Months Ended |
--- | --- | --- | ---
Jan. 01, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 USD ($) Contract | Mar. 31, 2019 USD ($) Contract | Dec. 31, 2019 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Secure borrowings and available lines of credit from FHLB and Federal Reserve Bank |  |  |  | $ 6,060,000,000.00 |  | $ 6,030,000,000.00
Loans held-for-sale |  |  |  | 0 |  | 0
Impaired, at carrying value |  |  |  | 2,800,000 | $ 20,290,000 | 8,389,000
Impaired, at carrying value |  |  |  |  | 435,000 | 508,000
Allowance for Credit Losses |  |  |  | 82,600,000 | $ 180,000 |
Provision for Credit Losses |  |  |  | $ 12,000,000.0 |  |
Percentage Of Allowance For Credit Losses | 0.93% |  |  | 1.11% |  |
Reserve for credit risk for undisbursed commitments |  |  |  | $ 9,000,000.0 |  | 9,000,000.0
Allocation of allowance to troubled debt restructuring |  |  |  | $ 0 |  | 0
Number of loans modified as a TDR within the previous 12 months that subsequently defaulted | Contract |  |  |  | 0 | 0 |
Increase in reserve for unfunded loan commitments |  |  |  | $ 0 |  |
Percentage of PCI loans to Loan Receivable |  | 10.00% | 20.00% |  |  |
Description of Effects in Loans due to COVID 19 |  |  |  | In accordance with regulatory guidance, if borrowers are less than 30 days past due on their loans, upon implementation of the modification program, or as allowed under the CARES Act if borrowers are less than 30 days past due on their loans as of December 31, 2019, and enter into short-term loan modifications offered as a result of COVID-19, their loans generally continue to be considered performing loans and continue to accrue interest during the period of the loan modification. For borrowers who are 30 days or more past due when entering into loan modifications offered as a result of COVID-19, we evaluate the loan modifications under our existing troubled debt restructuring framework, and where such a loan modification would result in a concession to a borrower experiencing financial difficulty, the loan will be accounted for as a TDR and will generally not accrue interest. For all borrowers who enroll in these loan modification programs offered as a result of COVID-19, the delinquency status of the borrowers is frozen, resulting in a static delinquency metric during the deferral period. Upon exiting the deferral program, the measurement of loan delinquency will resume where it had left off upon entry into the program. Through May 3, 2020, we have granted temporary payment deferments of interest or of principal and interest for 90 days on 620 loans in the amount of $940 million, or approximately 13% of our total loan portfolio at March 31, 2020. |  |
Unemployment [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of Increase Decrease In Macro Economic Factors |  | 6.00% | 9.00% |  |  |
Impact of ASU 2016-13 Adoption [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Increase in reserve for unfunded loan commitments |  |  |  | $ 41,000 |  |
Commercial Real Estate Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) |  |  |  | 77.08% |  |
Notes receivable gross |  |  |  | $ 5,347,925,000 |  | 5,374,617,000
Construction [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Percentage of total gross loan portfolio (excluding PCI loans) |  |  |  | 71.63% |  |
Commercial and Industrial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for Credit Losses |  |  |  |  | $ 0 |
Small Business Administration [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for Credit Losses |  |  |  |  | 0 |
Commercial Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for Credit Losses |  |  |  |  | $ 0 |
Performing Financing Receivable [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Impaired, at carrying value |  |  |  | $ 2,800,000 |  |
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 |  |
Performing Financing Receivable [Member] | Commercial and Industrial [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans classified as troubled debt restructured |  |  |  | 68,000 |  |
Performing Financing Receivable [Member] | Small Business Administration [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans classified as troubled debt restructured |  |  |  | 524,000 |  |
Performing Financing Receivable [Member] | Commercial Real Estate [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans classified as troubled debt restructured |  |  |  | 377,000 |  |
Loans, Excluding PCI Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Notes receivable gross |  |  |  | 272,100,000 |  |
Loans, Excluding PCI Loans [Member] | Dairy & Livestock Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Notes receivable gross |  |  |  | 218,000,000.0 |  | 323,500,000
Loans, Excluding PCI Loans [Member] | Agribusiness Loans [Member] |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Notes receivable gross |  |  |  | $ 54,100,000 |  | $ 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) |  |  |  | 4.64% |  | 4.50%
Notes receivable gross |  |  |  | $ 248,200,000 |  | $ 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 |  |  |  | 122,500,000 |  | 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 |  |  |  | $ 125,700,000 |  | $ 115,900,000

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