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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	Dec. 31, 2020 USD ($) Collateral
Financing Receivable, Modifications [Line Items]
Real Estate	$ 10,712
Business Assets	6,653
Other	$ 280
Number of Loans Dependent on Collateral | Collateral	41
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Real Estate	$ 7,883
Business Assets	0
Other	$ 0
Number of Loans Dependent on Collateral | Collateral	8
Construction [Member]
Financing Receivable, Modifications [Line Items]
Real Estate	$ 0
Business Assets	0
Other	$ 0
Number of Loans Dependent on Collateral | Collateral	0
Small Business Administration Loans [Member]
Financing Receivable, Modifications [Line Items]
Real Estate	$ 1,761
Business Assets	326
Other	$ 185
Number of Loans Dependent on Collateral | Collateral	10
SBA - Paycheck Protection Program (PPP) [Member]
Financing Receivable, Modifications [Line Items]
Real Estate	$ 0
Business Assets	0
Other	$ 0
Number of Loans Dependent on Collateral | Collateral	0
Commercial And Industrial [Member]
Financing Receivable, Modifications [Line Items]
Real Estate	$ 470
Business Assets	5,542
Other	$ 95
Number of Loans Dependent on Collateral | Collateral	18
Dairy & Livestock and Agribusiness [Member]
Financing Receivable, Modifications [Line Items]
Real Estate	$ 0
Business Assets	785
Other	$ 0
Number of Loans 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 Loans Dependent on Collateral | Collateral	0
SFR mortgage [Member]
Financing Receivable, Modifications [Line Items]
Real Estate	$ 430
Business Assets	0
Other	$ 0
Number of Loans Dependent on Collateral | Collateral	2
Consumer And Other Loans [Member]
Financing Receivable, Modifications [Line Items]
Real Estate	$ 168
Business Assets	0
Other	$ 0
Number of Loans Dependent on Collateral | Collateral	2

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Number Of Instruments Dependent On Collateral.

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- Definition

Recorded investment in collateral dependent loans on business assets.

+ References

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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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