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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	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2020	Dec. 31, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	$ 12,051		$ 7,811
Recorded Investment, With a related allowance recorded	2,455		578
Recorded Investment, Total impaired loans	14,506	$ 2,800	8,389
Unpaid Principal Balance, With no related allowance recorded	14,557		9,075
Unpaid Principal Balance, With a related allowance recorded	2,800		671
Unpaid Principal Balance, Total impaired loans	17,357		9,746
Related Allowance, With a related allowance recorded	371		508
Related Allowance, Total impaired loans	371		508
Average Recorded Investment, With no related allowance recorded	11,608
Average Recorded Investment, With a related allowance recorded	2,432
Average Recorded Investment, Total impaired loans	14,040
Interest Income Recognized, With no related allowance recorded	79
Interest Income Recognized, Total impaired loans	79
Commercial and Industrial [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	898		1,091
Recorded Investment, With a related allowance recorded	1,190		253
Unpaid Principal Balance, With no related allowance recorded	1,033		1,261
Unpaid Principal Balance, With a related allowance recorded	1,263		347
Related Allowance, With a related allowance recorded	276		251
Average Recorded Investment, With no related allowance recorded	1,022
Average Recorded Investment, With a related allowance recorded	1,251
Interest Income Recognized, With no related allowance recorded	2
Small Business Administration [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	4,369		2,243
Recorded Investment, With a related allowance recorded	1,263		325
Unpaid Principal Balance, With no related allowance recorded	5,714		2,734
Unpaid Principal Balance, With a related allowance recorded	1,534		324
Related Allowance, With a related allowance recorded	93		257
Average Recorded Investment, With no related allowance recorded	3,703
Average Recorded Investment, With a related allowance recorded	1,179
Interest Income Recognized, With no related allowance recorded	21
Commercial Real Estate Owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	502		479
Unpaid Principal Balance, With no related allowance recorded	616		613
Average Recorded Investment, With no related allowance recorded	515
Commercial Real Estate Non-owner Occupied [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	1,029		642
Unpaid Principal Balance, With no related allowance recorded	1,209		643
Average Recorded Investment, With no related allowance recorded	1,068
Interest Income Recognized, With no related allowance recorded	14
SFR Mortgage [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	4,858		2,979
Unpaid Principal Balance, With no related allowance recorded	5,467		3,310
Average Recorded Investment, With no related allowance recorded	4,893
Interest Income Recognized, With no related allowance recorded	42
Consumer and Other Loans [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Recorded Investment, With no related allowance recorded	395		377
Recorded Investment, With a related allowance recorded	2
Unpaid Principal Balance, With no related allowance recorded	518		$ 514
Unpaid Principal Balance, With a related allowance recorded	3
Related Allowance, With a related allowance recorded	2
Average Recorded Investment, With no related allowance recorded	407
Average Recorded Investment, With a related allowance recorded	$ 2

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