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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	9 Months Ended
	Sep. 30, 2019	Sep. 30, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	$ 8,723		$ 7,811
Recorded Investment, With a related allowance recorded	1,057		578
Recorded Investment, Total impaired loans	9,780	$ 2,200	8,389
Unpaid Principal Balance, With no related allowance recorded	10,749		9,075
Unpaid Principal Balance, With a related allowance recorded	1,161		671
Unpaid Principal Balance, Total impaired loans	11,910		9,746
Related Allowance, With no related allowance recorded	0		0
Related Allowance, With a related allowance recorded	540		508
Related Allowance, Total impaired loans	540		508
Average Recorded Investment, With no related allowance recorded	9,186
Average Recorded Investment, With a related allowance recorded	1,645
Average Recorded Investment, Total impaired loans	10,831
Interest Income Recognized, With no related allowance recorded	118
Interest Income Recognized, With a related allowance recorded	0
Interest Income Recognized, Total impaired loans	118
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	1,382		1,091
Recorded Investment, With a related allowance recorded	256		253
Unpaid Principal Balance, With no related allowance recorded	1,537		1,261
Unpaid Principal Balance, With a related allowance recorded	345		347
Related Allowance, With no related allowance recorded	0		0
Related Allowance, With a related allowance recorded	254		251
Average Recorded Investment, With no related allowance recorded	1,560
Average Recorded Investment, With a related allowance recorded	829
Interest Income Recognized, With no related allowance recorded	4
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	2,447		2,243
Recorded Investment, With a related allowance recorded	801		325
Unpaid Principal Balance, With no related allowance recorded	3,554		2,734
Unpaid Principal Balance, With a related allowance recorded	816		324
Related Allowance, With no related allowance recorded	0		0
Related Allowance, With a related allowance recorded	286		257
Average Recorded Investment, With no related allowance recorded	2,606
Average Recorded Investment, With a related allowance recorded	816
Interest Income Recognized, With no related allowance recorded	31
Interest Income Recognized, With a related allowance recorded	0
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	494		479
Recorded Investment, With a related allowance recorded	0		0
Unpaid Principal Balance, With no related allowance recorded	614		613
Unpaid Principal Balance, With a related allowance recorded	0		0
Related Allowance, With no related allowance recorded	0		0
Related Allowance, With a related allowance recorded	0		0
Average Recorded Investment, With no related allowance recorded	508
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	1,006		642
Recorded Investment, With a related allowance recorded	0		0
Unpaid Principal Balance, With no related allowance recorded	1,190		643
Unpaid Principal Balance, With a related allowance recorded	0		0
Related Allowance, With no related allowance recorded	0		0
Related Allowance, With a related allowance recorded	0		0
Average Recorded Investment, With no related allowance recorded	1,052
Average Recorded Investment, With a related allowance recorded	0
Interest Income Recognized, With no related allowance recorded	21
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		0
Recorded Investment, With a related allowance recorded	0		0
Unpaid Principal Balance, With no related allowance recorded	0		0
Unpaid Principal Balance, With a related allowance recorded	0		0
Related Allowance, With no related allowance recorded	0		0
Related Allowance, With a related allowance recorded	0		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		0
Recorded Investment, With a related allowance recorded	0		0
Unpaid Principal Balance, With no related allowance recorded	0		0
Unpaid Principal Balance, With a related allowance recorded	0		0
Related Allowance, With no related allowance recorded	0		0
Related Allowance, With a related allowance recorded	0		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	3,009		2,979
Recorded Investment, With a related allowance recorded	0		0
Unpaid Principal Balance, With no related allowance recorded	3,338		3,310
Unpaid Principal Balance, With a related allowance recorded	0		0
Related Allowance, With no related allowance recorded	0		0
Related Allowance, With a related allowance recorded	0		0
Average Recorded Investment, With no related allowance recorded	3,059
Average Recorded Investment, With a related allowance recorded	0
Interest Income Recognized, With no related allowance recorded	62
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		0
Recorded Investment, With a related allowance recorded	0		0
Unpaid Principal Balance, With no related allowance recorded	0		0
Unpaid Principal Balance, With a related allowance recorded	0		0
Related Allowance, With no related allowance recorded	0		0
Related Allowance, With a related allowance recorded	0		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		0
Recorded Investment, With a related allowance recorded	0		0
Unpaid Principal Balance, With no related allowance recorded	0		0
Unpaid Principal Balance, With a related allowance recorded	0		0
Related Allowance, With no related allowance recorded	0		0
Related Allowance, With a related allowance recorded	0		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
Consumer and Other Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	385		377
Recorded Investment, With a related allowance recorded	0		0
Unpaid Principal Balance, With no related allowance recorded	516		514
Unpaid Principal Balance, With a related allowance recorded	0		0
Related Allowance, With no related allowance recorded	0		0
Related Allowance, With a related allowance recorded	0		$ 0
Average Recorded Investment, With no related allowance recorded	401
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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