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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 | Jun. 30, 2021 USD ($) Collateral | Dec. 31, 2020 USD ($) Collateral
--- | --- | ---
Financing Receivable, Modifications [Line Items] |  |
Real Estate | $ 8,870 | $ 10,712
Business Assets | 7,203 | 6,653
Other | $ 294 | $ 280
Number of Loans Dependent on Collateral | Collateral | 46 | 41
Commercial Real Estate [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Real Estate | $ 7,144 | $ 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 | $ 625 | $ 1,761
Business Assets | 610 | 326
Other | $ 147 | $ 185
Number of Loans Dependent on Collateral | Collateral | 10 | 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 | $ 387 | $ 470
Business Assets | 6,475 | 5,542
Other | $ 147 | $ 95
Number of Loans Dependent on Collateral | Collateral | 22 | 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 | $ 406 | $ 430
Business Assets | 0 | 0
Other | $ 0 | $ 0
Number of Loans Dependent on Collateral | Collateral | 2 | 2
Consumer and Other Loans [Member] |  |
Financing Receivable, Modifications [Line Items] |  |
Real Estate | $ 308 | $ 168
Business Assets | 0 | 0
Other | $ 0 | $ 0
Number of Loans Dependent on Collateral | Collateral | 3 | 2

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