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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, 2020 USD ($) Collateral
Financing Receivable, Modifications [Line Items]
Real Estate	$ 8,874
Business Assets	6,049
Other	$ 89
Number of Instruments Dependent on Collateral | Collateral	40
Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Real Estate	$ 145
Business Assets	4,703
Other	$ 62
Number of Instruments Dependent on Collateral | Collateral	14
Small Business Administration [Member]
Financing Receivable, Modifications [Line Items]
Real Estate	$ 1,015
Business Assets	497
Other	$ 7
Number of Instruments Dependent on Collateral | Collateral	11
SBA - Paycheck Protection Program (PPP) [Member]
Financing Receivable, Modifications [Line Items]
Real Estate	$ 0
Business Assets	0
Other	$ 0
Number of Instruments Dependent on Collateral | Collateral	0
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Business Assets	$ 0
Other	0
Construction [Member]
Financing Receivable, Modifications [Line Items]
Real Estate	0
Business Assets	0
Other	$ 0
Number of Instruments Dependent on Collateral | Collateral	0
SFR Mortgage [Member]
Financing Receivable, Modifications [Line Items]
Real Estate	$ 675
Business Assets	0
Other	$ 0
Number of Instruments Dependent on Collateral | Collateral	3
Dairy & Livestock and Agribusiness [Member]
Financing Receivable, Modifications [Line Items]
Real Estate	$ 0
Business Assets	849
Other	$ 0
Number of Instruments Dependent on Collateral | Collateral	1
Municipal Lease Finance Receivables [Member]
Financing Receivable, Modifications [Line Items]
Real Estate	$ 0
Business Assets	0
Other	$ 0
Number of Instruments Dependent on Collateral | Collateral	0
Consumer and Other Loans [Member]
Financing Receivable, Modifications [Line Items]
Real Estate	$ 203
Business Assets	0
Other	$ 20
Number of Instruments Dependent on Collateral | Collateral	4
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Real Estate	$ 6,836
Number of Instruments Dependent on Collateral | Collateral	7

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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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