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Basis of Presentation and Significant Accounting Policies - Narrative (Details)
12 Months Ended
Dec. 31, 2022
USD ($)
loanSegment
Dec. 31, 2023
USD ($)
branch
office
segment
Dec. 31, 2022
USD ($)
loanSegment
Dec. 31, 2021
USD ($)
Jan. 01, 2023
USD ($)
Product Information [Line Items]          
Number of operating segments | segment   1      
Reserve and clearing required balance $ 0 $ 0 $ 0    
Interest on loans held-for-investment, threshold period past due   90 days      
General reserves, historical loss look-back period   11 years      
Qualified affordable housing project investment 4,300,000 $ 3,800,000 4,300,000    
Unfunded commitments 2,900,000 2,900,000 2,900,000    
Amortization expense recognized on qualified affordable housing projects   451,000 343,000 $ 247,000  
Federal tax credits and other benefits   674,000 336,000 $ 299,000  
Impairment of qualified affordable housing projects   0 0    
Net decrease in retained earnings (127,181,000) (146,092,000) (127,181,000)   $ (127,181,000)
Adjustment to allowance for credit losses on loans 2,021,121,000 2,295,919,000 2,021,121,000    
Adjustment to the allowance for credit losses on off-balance sheet credit exposures         299,000
Deferred tax assets arising from temporary differences $ 3,115,000 $ 0 $ 3,115,000   3,115,000
Number of loan segments before adoption of ASC 326 | loanSegment 4   4    
Financing Receivable, Excluding Accrued Interest | Loans Held-for-Investment Concentration Risk | Commercial and Industrial          
Product Information [Line Items]          
Concentration risk percentage 12.20%        
Impact of ASC 326 Adoption          
Product Information [Line Items]          
Net decrease in retained earnings         1,886,000
Adjustment to allowance for credit losses on loans         1,100,000
Adjustment to the allowance for credit losses on off-balance sheet credit exposures         1,607,000
Deferred tax assets arising from temporary differences         $ 788,000
Minimum          
Product Information [Line Items]          
Lease renewal term   1 year      
Minimum | Furniture, fixtures and equipment          
Product Information [Line Items]          
Estimated useful lives of premises and equipment   3 years      
Maximum          
Product Information [Line Items]          
Lease renewal term   5 years      
Maximum | Furniture, fixtures and equipment          
Product Information [Line Items]          
Estimated useful lives of premises and equipment   7 years      
Closed Loans          
Product Information [Line Items]          
Charge-off time period   120 days      
Open Loans          
Product Information [Line Items]          
Charge-off time period   180 days      
Commercial property | Financing Receivable, Excluding Accrued Interest | Loans Held-for-Investment Concentration Risk | Commercial real estate          
Product Information [Line Items]          
Concentration risk percentage 63.00%        
SBA property | Financing Receivable, Excluding Accrued Interest | Loans Held-for-Investment Concentration Risk | Commercial real estate          
Product Information [Line Items]          
Concentration risk percentage 6.60%        
California          
Product Information [Line Items]          
Number of full-service branches | branch   11      
Number of loan production offices | office   7      
California | Minimum          
Product Information [Line Items]          
Total assets of peer group   $ 1,000,000,000      
California | Maximum          
Product Information [Line Items]          
Total assets of peer group   $ 5,000,000,000      
New Jersey and New York          
Product Information [Line Items]          
Number of full-service branches | branch   3      
Texas          
Product Information [Line Items]          
Number of full-service branches | branch   2