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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, 2021 USD ($) Collateral	Dec. 31, 2020 USD ($) Collateral
Financing Receivable, Modifications [Line Items]
Real Estate	$ 9,504	$ 10,712
Business Assets	6,981	6,653
Other	$ 262	$ 280
Number of Loans Dependent on Collateral | Collateral	48	41
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Real Estate	$ 6,705	$ 7,883
Business Assets	0	0
Other	$ 0	$ 0
Number of Loans Dependent on Collateral | Collateral	8	8
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
Small Business Administration [Member]
Financing Receivable, Modifications [Line Items]
Real Estate	$ 608	$ 1,761
Business Assets	775	326
Other	$ 130	$ 185
Number of Loans Dependent on Collateral | Collateral	11	10
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	$ 743	$ 470
Business Assets	6,088	5,542
Other	$ 132	$ 95
Number of Loans Dependent on Collateral | Collateral	19	18
Dairy & Livestock and Agribusiness [Member]
Financing Receivable, Modifications [Line Items]
Real Estate	$ 0	$ 0
Business Assets	118	785
Other	$ 0	$ 0
Number of Loans Dependent on Collateral | Collateral	1	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	$ 1,143	$ 430
Business Assets	0	0
Other	$ 0	$ 0
Number of Loans Dependent on Collateral | Collateral	6	2
Consumer and Other Loans [Member]
Financing Receivable, Modifications [Line Items]
Real Estate	$ 305	$ 168
Business Assets	0	0
Other	$ 0	$ 0
Number of Loans Dependent on Collateral | Collateral	3	2

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