Loans and Lease Finance Receivables and Allowance for Credit Losses - Summary of Recorded Investment in Collateral-Dependent loans (Detail) $ in Thousands	Jun. 30, 2022 USD ($) Collateral	Dec. 31, 2021 USD ($) Collateral
Financing Receivable, Modifications [Line Items]
Real Estate	$ 10,586	$ 7,632
Business Assets	3,856	5,650
Other	$ 2,717	$ 208
Number of Loans Dependent on Collateral | Collateral	39	39
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Real Estate	$ 9,160	$ 6,001
Business Assets		0
Other		$ 0
Number of Loans Dependent on Collateral | Collateral	9	6
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 [Member]
Financing Receivable, Modifications [Line Items]
Real Estate	$ 233	$ 405
Business Assets	841	517
Other		$ 112
Number of Loans Dependent on Collateral | Collateral	8	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	$ 457	$ 688
Business Assets	2,998	5,133
Other	$ 79	$ 96
Number of Loans Dependent on Collateral | Collateral	15	19
Dairy & Livestock and Agribusiness [Member]
Financing Receivable, Modifications [Line Items]
Real Estate	$ 699	$ 0
Business Assets	17	0
Other	$ 2,638	$ 0
Number of Loans Dependent on Collateral | Collateral	6	0
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		$ 380
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	$ 37	$ 158
Business Assets		0
Other		$ 0
Number of Loans Dependent on Collateral | Collateral	1	2