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Loans and Lease Finance Receivables and Allowance for Loan Losses - Summary of Recorded Investment in Collateral-Dependent loans (Detail) $ in Thousands	Mar. 31, 2020 USD ($) Collateral
Financing Receivable, Modifications [Line Items]
Real Estate	$ 4,236
Business Assets	4,176
Other	$ 38
Number of Instruments Dependent on Collateral | Collateral	43
Commercial and Industrial [Member]
Financing Receivable, Modifications [Line Items]
Real Estate	$ 112
Business Assets	1,652
Other	$ 8
Number of Instruments Dependent on Collateral | Collateral	12
Small Business Administration [Member]
Financing Receivable, Modifications [Line Items]
Real Estate	$ 1,852
Business Assets	2,524
Other	$ 8
Number of Instruments Dependent on Collateral | Collateral	19
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	$ 864
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	0
Other	$ 0
Number of Instruments Dependent on Collateral | Collateral	0
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	$ 84
Business Assets	0
Other	$ 22
Number of Instruments Dependent on Collateral | Collateral	4
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Modifications [Line Items]
Real Estate	$ 1,324
Business Assets	0
Other	$ 0
Number of Instruments Dependent on Collateral | Collateral	5

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Number Of Instruments Dependent On Collateral.

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Recorded investment in collateral dependent loans on business assets.

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- Definition

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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