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Loans and Lease Finance Receivables and Allowance for Credit Losses - Summary of Recorded Investment in Collateral-Dependent loans (Detail) $ in Thousands	Sep. 30, 2024 USD ($) Collateral	Dec. 31, 2023 USD ($) Collateral
Financing Receivable, Modifications [Line Items]
Real Estate	$ 19,080	$ 16,965
Business Assets	2,749	3,170
Other	$ 82	$ 1,167
Number of Loans Dependent on Collateral | Collateral	14	19
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Real Estate	$ 18,794	$ 15,440
Business Assets	0	0
Other	$ 0	$ 0
Number of Loans Dependent on Collateral | Collateral	5	5
Construction [Member]
Financing Receivable, Modifications [Line Items]
Real Estate	$ 0	$ 0
Business Assets	0	0
Other	$ 0	$ 0
Number of Loans Dependent on Collateral | Collateral	0	0
SBA [Member]
Financing Receivable, Modifications [Line Items]
Real Estate	$ 146	$ 749
Business Assets	5	220
Other	$ 0	$ 0
Number of Loans Dependent on Collateral | Collateral	3	4
SBA - Paycheck Protection Program (PPP) [Member]
Financing Receivable, Modifications [Line Items]
Real Estate	$ 0	$ 0
Business Assets	0	0
Other	$ 0	$ 0
Number of Loans Dependent on Collateral | Collateral	0	0
Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Real Estate	$ 80	$ 392
Business Assets	2,744	2,950
Other	$ 0	$ 1,167
Number of Loans Dependent on Collateral | Collateral	4	8
Dairy & Livestock and Agribusiness [Member]
Financing Receivable, Modifications [Line Items]
Real Estate	$ 60	$ 60
Business Assets	0	0
Other	$ 82	$ 0
Number of Loans Dependent on Collateral | Collateral	2	1
Municipal Lease Finance Receivables [Member]
Financing Receivable, Modifications [Line Items]
Real Estate	$ 0	$ 0
Business Assets	0	0
Other	$ 0	$ 0
Number of Loans Dependent on Collateral | Collateral	0	0
SFR Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Real Estate	$ 0	$ 324
Business Assets	0	0
Other	$ 0	$ 0
Number of Loans Dependent on Collateral | Collateral	0	1
Consumer and Other Loans [Member]
Financing Receivable, Modifications [Line Items]
Real Estate	$ 0	$ 0
Business Assets	0	0
Other	$ 0	$ 0
Number of Loans Dependent on Collateral | Collateral	0	0

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Number Of Instruments Dependent On Collateral.

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- Definition

Recorded investment in collateral dependent loans on business assets.

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Recorded investment in collateral dependent loans on other financial instruments.

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Recorded investment in collateral dependent loans on real estate.

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