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Reserve for undisbursed commitments.

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Amount, after recoveries, of loans and leases that have been written-off.

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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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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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Loans and Lease Finance Receivables and Allowance for Credit Losses - Additional Information (Detail)		3 Months Ended		12 Months Ended
	Jan. 07, 2022 USD ($)	Mar. 31, 2022 USD ($) Loan	Mar. 31, 2021 USD ($) Loan	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Secure borrowings and available lines of credit from FHLB and Federal Reserve Bank		$ 4,090,000,000.00					$ 3,960,000,000
Loans held-for-sale		0					0
Impaired, at carrying value		5,300,000
Allowance for Credit Losses	$ (4,900,000)	(76,100,000)					(65,000,000.0)
Net charge-offs		5,000	$ 2,400,000
Reserve for credit risk for undisbursed commitments		8,000,000.0					8,000,000.0
Allocation of allowance to troubled debt restructuring		0					$ 0
Increase in reserve for unfunded loan commitments		0	$ 0
Allowance For Credit Losses Increase Decrease		11,100,000
Provision For Credit Losses		$ 2,500,000
Recapture of provision for credit losses	2,400,000
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts \| Loan		0	0
Maximum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)		0.90%					0.84%
Minimum [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)		0.89%					0.82%
GDP [Member] \| Forecast [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors				3.00%	1.30%	2.60%
Unemployment [Member] \| Forecast [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors				4.70%	5.20%	4.30%
Suncrest Bank [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
PCD Loans	8,600,000	$ 8,600,000
Provision For Credit Losses	$ 2,500,000
Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)		79.14%
Notes receivable gross		$ 6,470,841,000					$ 5,789,730,000
Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)		75.32%
Performing Financing Receivable [Member] \| Single-family Residential Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructured		$ 1,000,000.0
Performing Financing Receivable [Member] \| Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructured		1,900,000
Performing Financing Receivable [Member] \| Commercial Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructured		2,400,000
Loans, Excluding PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross		292,800,000					386,200,000
Allowance for Credit Losses		(121,200,000)
Loans, Excluding PCI Loans [Member] \| Dairy & Livestock Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross		241,700,000					351,700,000
Loans, Excluding PCI Loans [Member] \| Agribusiness Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross		$ 51,100,000					$ 34,500,000
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)		7.80%					6.29%
Notes receivable gross		$ 504,500,000					$ 364,400,000
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		134,500,000					134,900,000
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		$ 370,000,000.0					$ 229,500,000