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Summary of Significant Accounting Policies - Narrative (Details)
 12 Months Ended
Dec. 31, 2022
USD ($)
store
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Jan. 01, 2020
USD ($)
Dec. 31, 2019
USD ($)
Property, Plant and Equipment [Line Items]          
Intangible assets $ 0 $ 0      
Unamortized multifamily FHA MSR's 2,400,000 1,500,000      
Amortization of discount and premium 13,600,000        
Accretion discounts and premiums (9,011,000) (4,031,000) $ (8,196,000)    
Retained earnings $ 1,015,215,000 930,061,000      
Reasonable and Supportable period (in years) 18 months        
Historical loss rate period 12 months        
Investment Income, Amortization of Discount $ 4,600,000        
Less allowance for credit losses (74,444,000) (74,965,000) (109,579,000)   $ (73,658,000)
Reserve for unfunded commitments $ 5,857,000 $ 4,379,000      
Cumulative Effect, Period of Adoption, Adjustment          
Property, Plant and Equipment [Line Items]          
Less allowance for credit losses     $ 0   $ (10,614,000)
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2016-13          
Property, Plant and Equipment [Line Items]          
Retained earnings       $ 14,700,000  
Less allowance for credit losses       (10,600,000)  
Reserve for unfunded commitments       $ 4,100,000  
Minimum          
Property, Plant and Equipment [Line Items]          
Days from commitment to closing 30 days        
Maximum          
Property, Plant and Equipment [Line Items]          
Days from commitment to closing 90 days        
Furniture Fixtures and Equipment | Minimum          
Property, Plant and Equipment [Line Items]          
Property, plant and equipment, useful life 3 years        
Furniture Fixtures and Equipment | Maximum          
Property, Plant and Equipment [Line Items]          
Property, plant and equipment, useful life 7 years        
Computer Software and Hardware | Minimum          
Property, Plant and Equipment [Line Items]          
Property, plant and equipment, useful life 3 years        
Computer Software and Hardware | Maximum          
Property, Plant and Equipment [Line Items]          
Property, plant and equipment, useful life 5 years        
Building Improvements | Minimum          
Property, Plant and Equipment [Line Items]          
Property, plant and equipment, useful life 5 years        
Building Improvements | Maximum          
Property, Plant and Equipment [Line Items]          
Property, plant and equipment, useful life 20 years        
Banking Services          
Property, Plant and Equipment [Line Items]          
Number of stores | store 16        
Lending Services          
Property, Plant and Equipment [Line Items]          
Number of stores | store 5