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Loans and Lease Finance Receivables and Allowance for Credit Losses - Additional Information (Detail)		3 Months Ended		9 Months Ended
	Jan. 07, 2022 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022 USD ($) Loan	Sep. 30, 2021 USD ($) Loan	Dec. 31, 2021 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross		$ 8,764,319,000					$ 8,764,319,000		$ 7,879,537,000
Loans held-for-sale		0					0		0
Impaired, at carrying value		5,800,000					5,800,000
Allowance for Credit Losses	$ 4,900,000	82,600,000					82,600,000		65,000,000.0
Reserve for credit risk for undisbursed commitments		8,000,000.0					8,000,000.0		8,000,000.0
Allocation of allowance to troubled debt restructuring		0					0		0
Increase in reserve for unfunded loan commitments		0	$ 0				0	$ 1,000,000
Allowance For Credit Losses Increase Decrease							17,600,000
Provision For Credit Losses							8,100,000
Allowance For Credit Losses Write Offs							$ 8,000,000.0
Financing Receivable, Troubled Debt Restructuring, Subsequent Default, Number of Contracts \| Loan							0	0
Loan Pledged As Collateral		$ 4,330,000,000					$ 4,330,000,000		3,960,000,000
Purchased Credit Deteriorated (PCD) Loans	$ 8,600,000
Recovery							877,000
Allowance for write off								$ 2,800,000
Suncrest PCD Loans
Accounts, Notes, Loans and Financing Receivable [Line Items]
Provision For Credit Losses							4,900,000
Purchased Credit Deteriorated (PCD) Loans							8,600,000
Recovery							$ 877,000
Forecast [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors				5.10%	5.30%	5.00%
GDP [Member] \| Forecast [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of Increase Decrease In Macro Economic Factors				2.50%	1.60%	0.40%
Commercial Real Estate Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)		80.07%					80.07%
Notes receivable gross		$ 6,685,245,000					$ 6,685,245,000		5,789,730,000
Construction [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)		76.19%					76.19%
Commercial and Industrial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross		$ 950,923,000					$ 950,923,000		$ 811,691,000
Performing Financing Receivable [Member] \| Single-family Residential Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans classified as troubled debt restructured		1,000,000.0					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		$ 4,800,000					$ 4,800,000
Minimum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)		0.94%					0.94%		0.82%
Maximum
Accounts, Notes, Loans and Financing Receivable [Line Items]
Percentage of total gross loan portfolio (excluding PCI loans)		0.94%					0.94%		0.84%
Loans, Excluding PCI Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross		$ 323,100,000					$ 323,100,000		$ 386,200,000
Allowance for Credit Losses		17,300,000					17,300,000
Loans, Excluding PCI Loans [Member] \| Dairy & Livestock Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross		264,700,000					264,700,000
Loans, Excluding PCI Loans [Member] \| Agribusiness Loans [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross		$ 58,400,000					$ 58,400,000		$ 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)		7.28%					7.28%		6.29%
Notes receivable gross		$ 486,400,000					$ 486,400,000		$ 364,400,000
Loans, Excluding PCI Loans [Member] \| Loans Secured by Farmland [Member] \| Loans Secured by Dairy & Livestock Land [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Notes receivable gross		136,900,000					136,900,000
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									134,900,000
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		$ 349,500					$ 349,500		$ 229,500,000