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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, 2021
USD ($)
Collateral
Dec. 31, 2020
USD ($)
Collateral
Financing Receivable, Modifications [Line Items]    
Real Estate $ 7,632 $ 10,712
Business Assets 5,650 6,653
Other $ 208 $ 280
Number of Loans Dependent on Collateral | Collateral 39 41
Commercial Real Estate [Member]    
Financing Receivable, Modifications [Line Items]    
Real Estate $ 6,001 $ 7,883
Business Assets 0 0
Other $ 0 $ 0
Number of Loans Dependent on Collateral | Collateral 6 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 Loans [Member]    
Financing Receivable, Modifications [Line Items]    
Real Estate $ 405 $ 1,761
Business Assets 517 326
Other $ 112 $ 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 $ 688 $ 470
Business Assets 5,133 5,542
Other $ 96 $ 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 0 785
Other $ 0 $ 0
Number of Loans Dependent on Collateral | Collateral 0 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 $ 380 $ 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 $ 158 $ 168
Business Assets 0 0
Other $ 0 $ 0
Number of Loans Dependent on Collateral | Collateral 2 2