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Allocation of reserves to troubled debt restructuring.

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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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Percentage of increase decrease in macro economic factors.

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Percentage of weighted forecast.

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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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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	9 Months Ended		12 Months Ended
	Jan. 01, 2020 USD ($)	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Sep. 30, 2020 USD ($) Contract	Sep. 30, 2019 USD ($) Contract	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2019 USD ($)
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				2,200,000		2,200,000	$ 9,780,000			8,389,000
Allowance for Credit Losses				93,900,000		93,900,000
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
Allowance For Credit Losses Increase Decrease				114,000		25,200,000
Provision For Credit Losses				0	$ 23,500,000
Allowance For Credit Losses Write Offs				$ 114,000
Transition adjustment, allowance for credit loses for loans	$ 1,800,000					$ 1,800,000
Baseline Forecast [Member] \| Minimum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of weighted forecast				50.00%		50.00%
GDP [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors				27.00%
GDP [Member] \| Forecast [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors		3.50%	2.90%					5.00%
Unemployment [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors						11.00%
Unemployment [Member] \| Forecast [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors		8.90%						6.40%	8.00%
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)				69.04%		69.04%
Notes receivable gross				$ 5,428,223,000		$ 5,428,223,000				5,374,617,000
Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)				64.56%		64.56%
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				47,000		47,000
Performing Financing Receivable [Member] \| Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructured				354,000		354,000
Loans, Excluding PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross				252,800,000		252,800,000
Loans, Excluding PCI Loans [Member] \| Dairy & Livestock Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross				210,400,000		210,400,000				323,500,000
Loans, Excluding PCI Loans [Member] \| Agribusiness Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross				$ 42,400,000		$ 42,400,000				$ 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)				5.00%		5.00%				4.50%
Notes receivable gross				$ 271,200,000		$ 271,200,000				$ 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				121,100,000		121,100,000				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				$ 150,200,000		$ 150,200,000				$ 115,900,000