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Loans and Lease Finance Receivables and Allowance for Loan Losses - Schedule of Held-for-Investment Loans, Individually Evaluated for Impairment by Class of Loans (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Mar. 31, 2020
Dec. 31, 2019
Financing Receivable, Allowance for Credit Losses [Line Items]      
Recorded Investment, With no related allowance recorded $ 18,724   $ 7,811
Recorded Investment, With a related allowance recorded 1,566   578
Recorded Investment, Total impaired loans 20,290 $ 2,800 8,389
Unpaid Principal Balance, With no related allowance recorded 26,435   9,075
Unpaid Principal Balance, With a related allowance recorded 1,546   671
Unpaid Principal Balance, Total impaired loans 27,981   9,746
Related Allowance, With a related allowance recorded 435   508
Related Allowance, Total impaired loans 435   508
Average Recorded Investment, With no related allowance recorded 18,910    
Average Recorded Investment, With a related allowance recorded 1,585    
Average Recorded Investment, Total impaired loans 20,495    
Interest Income Recognized, With no related allowance recorded 41    
Interest Income Recognized, Total impaired loans 41    
Commercial and Industrial [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Recorded Investment, With no related allowance recorded 8,208   1,091
Recorded Investment, With a related allowance recorded 304   253
Unpaid Principal Balance, With no related allowance recorded 12,317   1,261
Unpaid Principal Balance, With a related allowance recorded 309   347
Related Allowance, With a related allowance recorded 117   251
Average Recorded Investment, With no related allowance recorded 8,230    
Average Recorded Investment, With a related allowance recorded 323    
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 3,400   2,243
Recorded Investment, With a related allowance recorded 1,261   325
Unpaid Principal Balance, With no related allowance recorded 5,779   2,734
Unpaid Principal Balance, With a related allowance recorded 1,236   324
Related Allowance, With a related allowance recorded 317   257
Average Recorded Investment, With no related allowance recorded 3,511    
Average Recorded Investment, With a related allowance recorded 1,261    
Interest Income Recognized, With no related allowance recorded 11    
Commercial Real Estate Owner Occupied [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Recorded Investment, With no related allowance recorded 519   479
Unpaid Principal Balance, With no related allowance recorded 618   613
Average Recorded Investment, With no related allowance recorded 521    
Commercial Real Estate Non-owner Occupied [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Recorded Investment, With no related allowance recorded 1,070   642
Unpaid Principal Balance, With no related allowance recorded 1,231   643
Average Recorded Investment, With no related allowance recorded 1,084    
Interest Income Recognized, With no related allowance recorded 7    
SFR Mortgage [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Recorded Investment, With no related allowance recorded 5,051   2,979
Unpaid Principal Balance, With no related allowance recorded 5,865   3,310
Average Recorded Investment, With no related allowance recorded 5,082    
Interest Income Recognized, With no related allowance recorded 21    
Consumer and Other Loans [Member]      
Financing Receivable, Allowance for Credit Losses [Line Items]      
Recorded Investment, With no related allowance recorded 476   377
Recorded Investment, With a related allowance recorded 1    
Unpaid Principal Balance, With no related allowance recorded 625   $ 514
Unpaid Principal Balance, With a related allowance recorded 1    
Related Allowance, With a related allowance recorded 1    
Average Recorded Investment, With no related allowance recorded 482    
Average Recorded Investment, With a related allowance recorded $ 1