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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	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2020
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	$ 7,811	$ 20,067
Recorded Investment, With a related allowance recorded	578	3,478
Recorded Investment, Total impaired loans	8,389	23,545	$ 2,200
Unpaid Principal Balance, With no related allowance recorded	9,075	29,028
Unpaid Principal Balance, With a related allowance recorded	671	3,513
Unpaid Principal Balance, Total impaired loans	9,746	32,541
Related Allowance, With no related allowance recorded	0	0
Related Allowance, With a related allowance recorded	508	561
Related Allowance, Total impaired loans	508	561
Average Recorded Investment, With no related allowance recorded	8,383	22,789
Average Recorded Investment, With a related allowance recorded	1,026	3,501
Average Recorded Investment, Total impaired loans	9,409	26,290
Interest Income Recognized, With no related allowance recorded	157	163
Interest Income Recognized, With a related allowance recorded	0	0
Interest Income Recognized, Total impaired loans	157	163
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	1,091	7,436
Recorded Investment, With a related allowance recorded	253	189
Unpaid Principal Balance, With no related allowance recorded	1,261	11,457
Unpaid Principal Balance, With a related allowance recorded	347	191
Related Allowance, With no related allowance recorded	0	0
Related Allowance, With a related allowance recorded	251	3
Average Recorded Investment, With no related allowance recorded	1,369	7,718
Average Recorded Investment, With a related allowance recorded	699	203
Interest Income Recognized, With no related allowance recorded	4	7
Interest Income Recognized, With a related allowance recorded	0	0
Small Business Administration [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	2,243	3,467
Recorded Investment, With a related allowance recorded	325	0
Unpaid Principal Balance, With no related allowance recorded	2,734	5,746
Unpaid Principal Balance, With a related allowance recorded	324	0
Related Allowance, With no related allowance recorded	0	0
Related Allowance, With a related allowance recorded	257	0
Average Recorded Investment, With no related allowance recorded	2,389	3,919
Average Recorded Investment, With a related allowance recorded	327	0
Interest Income Recognized, With no related allowance recorded	41	44
Interest Income Recognized, With a related allowance recorded	0	0
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	479	589
Recorded Investment, With a related allowance recorded	0	0
Unpaid Principal Balance, With no related allowance recorded	613	705
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	505	624
Average Recorded Investment, With a related allowance recorded	0	0
Interest Income Recognized, With no related allowance recorded	0	0
Interest Income Recognized, With a related allowance recorded	0	0
Commercial Real Estate Non-owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	642	2,808
Recorded Investment, With a related allowance recorded	0	3,143
Unpaid Principal Balance, With no related allowance recorded	643	4,324
Unpaid Principal Balance, With a related allowance recorded	0	3,144
Related Allowance, With no related allowance recorded	0	0
Related Allowance, With a related allowance recorded	0	478
Average Recorded Investment, With no related allowance recorded	681	4,585
Average Recorded Investment, With a related allowance recorded	0	3,144
Interest Income Recognized, With no related allowance recorded	26	32
Interest Income Recognized, With a related allowance recorded	0	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	0
Average Recorded Investment, With a related allowance recorded	0	0
Interest Income Recognized, With no related allowance recorded	0	0
Interest Income Recognized, With a related allowance recorded	0	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	0
Average Recorded Investment, With a related allowance recorded	0	0
Interest Income Recognized, With no related allowance recorded	0	0
Interest Income Recognized, With a related allowance recorded	0	0
SFR Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	2,979	5,349
Recorded Investment, With a related allowance recorded	0	0
Unpaid Principal Balance, With no related allowance recorded	3,310	6,270
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	3,043	5,484
Average Recorded Investment, With a related allowance recorded	0	0
Interest Income Recognized, With no related allowance recorded	86	80
Interest Income Recognized, With a related allowance recorded	0	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	78
Unpaid Principal Balance, With no related allowance recorded	0	0
Unpaid Principal Balance, With a related allowance recorded	0	78
Related Allowance, With no related allowance recorded	0	0
Related Allowance, With a related allowance recorded	0	12
Average Recorded Investment, With no related allowance recorded	0	0
Average Recorded Investment, With a related allowance recorded	0	78
Interest Income Recognized, With no related allowance recorded	0	0
Interest Income Recognized, With a related allowance recorded	0	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	0
Average Recorded Investment, With a related allowance recorded	0	0
Interest Income Recognized, With no related allowance recorded	0	0
Interest Income Recognized, With a related allowance recorded	0	0
Consumer and Other Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	377	418
Recorded Investment, With a related allowance recorded	0	68
Unpaid Principal Balance, With no related allowance recorded	514	526
Unpaid Principal Balance, With a related allowance recorded	0	100
Related Allowance, With no related allowance recorded	0	0
Related Allowance, With a related allowance recorded	0	68
Average Recorded Investment, With no related allowance recorded	396	459
Average Recorded Investment, With a related allowance recorded	0	76
Interest Income Recognized, With no related allowance recorded	0	0
Interest Income Recognized, With a related allowance recorded	$ 0	$ 0

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