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Summary of Significant Accounting Policies - Narrative (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2023
USD ($)
store
numberOfOperatingSegment
Dec. 31, 2022
USD ($)
Property, Plant and Equipment [Line Items]    
Unamortized multifamily FHA MSR's $ 2.3 $ 2.4
Amortization of discount and premium 10.9  
Investment income, amortization of discount $ 4.7  
Reasonable and supportable period (in months) 18 months  
Historical loss rate period 12 months  
Financing receivable, individually evaluated for impairment $ 1.0  
Number of reportable segments | numberOfOperatingSegment 1  
Furniture Fixtures and Equipment | Minimum    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, useful life (in years) 3 years  
Furniture Fixtures and Equipment | Maximum    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, useful life (in years) 7 years  
Computer Software and Hardware | Minimum    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, useful life (in years) 3 years  
Computer Software and Hardware | Maximum    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, useful life (in years) 5 years  
Building Improvements | Minimum    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, useful life (in years) 5 years  
Building Improvements | Maximum    
Property, Plant and Equipment [Line Items]    
Property, plant and equipment, useful life (in years) 20 years  
Banking Services    
Property, Plant and Equipment [Line Items]    
Number of stores | store 13  
Lending Services    
Property, Plant and Equipment [Line Items]    
Number of stores | store 4