Loans and Lease Finance Receivables and Allowance for Credit Losses - Schedule of Held-for-Investment Loans, Individually Evaluated for Impairment by Class of Loans (Detail) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2021
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	$ 7,811
Recorded Investment, With a related allowance recorded	578
Recorded Investment, Total impaired loans	8,389	$ 5,300
Unpaid Principal Balance, With no related allowance recorded	9,075
Unpaid Principal Balance, With a related allowance recorded	671
Unpaid Principal Balance, Total impaired loans	9,746
Related Allowance, With no related allowance recorded	0
Related Allowance, With a related allowance recorded	508
Related Allowance, Total impaired loans	508
Average Recorded Investment, With no related allowance recorded	8,383
Average Recorded Investment, With a related allowance recorded	1,026
Average Recorded Investment, Total impaired loans	9,409
Interest Income Recognized, With no related allowance recorded	157
Interest Income Recognized, With a related allowance recorded	0
Interest Income Recognized, Total impaired loans	157
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	479
Recorded Investment, With a related allowance recorded	0
Unpaid Principal Balance, With no related allowance recorded	613
Unpaid Principal Balance, With a related allowance recorded	0
Related Allowance, With no related allowance recorded	0
Related Allowance, With a related allowance recorded	0
Average Recorded Investment, With no related allowance recorded	505
Average Recorded Investment, With a related allowance recorded	0
Interest Income Recognized, With no related allowance recorded	0
Interest Income Recognized, With a related allowance recorded	0
Commercial Real Estate Non-owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	642
Recorded Investment, With a related allowance recorded	0
Unpaid Principal Balance, With no related allowance recorded	643
Unpaid Principal Balance, With a related allowance recorded	0
Related Allowance, With no related allowance recorded	0
Related Allowance, With a related allowance recorded	0
Average Recorded Investment, With no related allowance recorded	681
Average Recorded Investment, With a related allowance recorded	0
Interest Income Recognized, With no related allowance recorded	26
Interest Income Recognized, With a related allowance recorded	0
Construction Speculative [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	0
Recorded Investment, With a related allowance recorded	0
Unpaid Principal Balance, With no related allowance recorded	0
Unpaid Principal Balance, With a related allowance recorded	0
Related Allowance, With no related allowance recorded	0
Related Allowance, With a related allowance recorded	0
Average Recorded Investment, With no related allowance recorded	0
Average Recorded Investment, With a related allowance recorded	0
Interest Income Recognized, With no related allowance recorded	0
Interest Income Recognized, With a related allowance recorded	0
Construction Non-speculative [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	0
Recorded Investment, With a related allowance recorded	0
Unpaid Principal Balance, With no related allowance recorded	0
Unpaid Principal Balance, With a related allowance recorded	0
Related Allowance, With no related allowance recorded	0
Related Allowance, With a related allowance recorded	0
Average Recorded Investment, With no related allowance recorded	0
Average Recorded Investment, With a related allowance recorded	0
Interest Income Recognized, With no related allowance recorded	0
Interest Income Recognized, With a related allowance recorded	0
Small Business Administration [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	2,243
Recorded Investment, With a related allowance recorded	325
Unpaid Principal Balance, With no related allowance recorded	2,734
Unpaid Principal Balance, With a related allowance recorded	324
Related Allowance, With no related allowance recorded	0
Related Allowance, With a related allowance recorded	257
Average Recorded Investment, With no related allowance recorded	2,389
Average Recorded Investment, With a related allowance recorded	327
Interest Income Recognized, With no related allowance recorded	41
Interest Income Recognized, With a related allowance recorded	0
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	1,091
Recorded Investment, With a related allowance recorded	253
Unpaid Principal Balance, With no related allowance recorded	1,261
Unpaid Principal Balance, With a related allowance recorded	347
Related Allowance, With no related allowance recorded	0
Related Allowance, With a related allowance recorded	251
Average Recorded Investment, With no related allowance recorded	1,369
Average Recorded Investment, With a related allowance recorded	699
Interest Income Recognized, With no related allowance recorded	4
Interest Income Recognized, With a related allowance recorded	0
Dairy & Livestock and Agribusiness [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	0
Recorded Investment, With a related allowance recorded	0
Unpaid Principal Balance, With no related allowance recorded	0
Unpaid Principal Balance, With a related allowance recorded	0
Related Allowance, With no related allowance recorded	0
Related Allowance, With a related allowance recorded	0
Average Recorded Investment, With no related allowance recorded	0
Average Recorded Investment, With a related allowance recorded	0
Interest Income Recognized, With no related allowance recorded	0
Interest Income Recognized, With a related allowance recorded	0
Municipal Lease Finance Receivables [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	0
Recorded Investment, With a related allowance recorded	0
Unpaid Principal Balance, With no related allowance recorded	0
Unpaid Principal Balance, With a related allowance recorded	0
Related Allowance, With no related allowance recorded	0
Related Allowance, With a related allowance recorded	0
Average Recorded Investment, With no related allowance recorded	0
Average Recorded Investment, With a related allowance recorded	0
Interest Income Recognized, With no related allowance recorded	0
Interest Income Recognized, With a related allowance recorded	0
SFR Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	2,979
Recorded Investment, With a related allowance recorded	0
Unpaid Principal Balance, With no related allowance recorded	3,310
Unpaid Principal Balance, With a related allowance recorded	0
Related Allowance, With no related allowance recorded	0
Related Allowance, With a related allowance recorded	0
Average Recorded Investment, With no related allowance recorded	3,043
Average Recorded Investment, With a related allowance recorded	0
Interest Income Recognized, With no related allowance recorded	86
Interest Income Recognized, With a related allowance recorded	0
Consumer and Other Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	377
Recorded Investment, With a related allowance recorded	0
Unpaid Principal Balance, With no related allowance recorded	514
Unpaid Principal Balance, With a related allowance recorded	0
Related Allowance, With no related allowance recorded	0
Related Allowance, With a related allowance recorded	0
Average Recorded Investment, With no related allowance recorded	396
Average Recorded Investment, With a related allowance recorded	0
Interest Income Recognized, With no related allowance recorded	0
Interest Income Recognized, With a related allowance recorded	$ 0

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Average amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

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