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Allocation of reserves to troubled debt restructuring.

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Description of effects in loans due to COVID 19

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Provision for unfunded commitments during the period, representing either increases or decreases.

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Loans classified as a troubled debt restructured.

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Loans receivable percentage of portfolio.

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Reserve for undisbursed commitments.

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Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Amount of increase (decrease) in allowance for credit loss on financing receivable.

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Amount of writeoff of financing receivable, charged against allowance for credit loss.

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Number of financing receivable contracts modified as troubled debt restructuring within previous 12 months, with subsequent payment default.

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Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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Carrying amount as of the balance sheet date of loans that have been pledged as collateral for borrowings. If the secured party has the right by contract or custom to sell or re-pledge the collateral, then the debtor reclassifies that asset and report that asset in its statement of financial position separately from other assets not so encumbered.

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The face amount of loans that will be sold to other entities.

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Amount, before allowance for credit loss, of financing receivable.

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Amount of expense related loan transactions, lease transactions, credit loss from transactions other than loan and lease transactions, and other loss based on assessment of uncollectability from the counterparty to reduce the account to their net realizable value.

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Loans and Lease Finance Receivables and Allowance for Credit Losses - Additional Information (Detail)		3 Months Ended		6 Months Ended			12 Months Ended
	Jan. 01, 2020 USD ($)	Sep. 30, 2020	Jun. 30, 2020 USD ($)	Dec. 31, 2020	Jun. 30, 2020 USD ($) Contract	Jun. 30, 2019 USD ($) Contract	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019 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			$ 6,000,000,000.00		$ 6,000,000,000.00					$ 6,030,000,000.00
Loans held-for-sale			0		0					0
Impaired, at carrying value			2,800,000		2,800,000	$ 14,506,000				8,389,000
Allowance for Credit Losses			94,000,000.0		94,000,000.0
Reserve for credit risk for undisbursed commitments			9,000,000.0		9,000,000.0					9,000,000.0
Allocation of allowance to troubled debt restructuring			0		$ 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
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.
Allowance For Credit Losses Increase Decrease			11,300,000		$ 25,300,000
Provision For Credit Losses			11,500,000		23,500,000
Allowance For Credit Losses Write Offs			$ 158,000
Transition adjustment, allowance for credit loses for loans	$ 1,800,000				1,800,000
Unemployment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors			14.00%
Unemployment [Member] \| Forecast [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors				9.00%			7.50%	9.70%
GDP [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors			33.00%
GDP [Member] \| Forecast [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors		18.00%					6.40%	1.00%	6.00%
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)			68.76%		68.76%
Notes receivable gross			$ 5,365,120,000		$ 5,365,120,000					5,374,617,000
Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)			63.85%		63.85%
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			51,000		51,000
Performing Financing Receivable [Member] \| Small Business Administration [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructured			517,000		517,000
Performing Financing Receivable [Member] \| Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructured			371,000		371,000
Loans, Excluding PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross			251,800,000		251,800,000
Loans, Excluding PCI Loans [Member] \| Dairy & Livestock Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross			201,700,000		201,700,000					323,500,000
Loans, Excluding PCI Loans [Member] \| Agribusiness Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross			$ 50,100,000		$ 50,100,000					$ 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)			4.63%		4.63%					4.50%
Notes receivable gross			$ 248,600,000		$ 248,600,000					$ 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			121,900,000		121,900,000					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			$ 126,700,000		$ 126,700,000					$ 115,900,000