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Loans and Allowance for Credit Losses on Loans - Narrative (Details)
12 Months Ended
Aug. 31, 2023
USD ($)
loan
Nov. 03, 2022
USD ($)
loan
Sep. 22, 2022
USD ($)
May 05, 2022
USD ($)
security
Dec. 31, 2023
USD ($)
loan
Dec. 31, 2022
USD ($)
loan
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Loans and Allowance for Credit Losses on Loans                
Proceeds from sale of loans receivable         $ 65,768,000 $ 788,848,000 $ 262,086,000  
Purchase of loans         358,462,000 551,091,000 369,148,000  
Gain on sale of loans         48,183,000 64,150,000 111,185,000  
Payments to held to maturity security         293,268,000 1,252,793,000    
Servicing rights         158,457,000 146,248,000 110,348,000 $ 82,604,000
Purchases of available for sale securities         $ 1,291,874,000 51,197,000 $ 221,191,000  
Loan Sale and Freddie Mac Q Series Securitization                
Loans and Allowance for Credit Losses on Loans                
First loss position in loan portfolio, maximum securitization pool, percentage       12.00% 12.00%      
First loss position in loan portfolio, maximum securitization pool, amount       $ 25,700,000        
First loss position in loan portfolio, reserves for losses       1,200,000        
Gain on sale of loans   $ 121,000   2,300,000        
Servicing rights   1,300,000   1,200,000        
Loan Sale and Freddie Mac Q Series Securitization | Other liabilities                
Loans and Allowance for Credit Losses on Loans                
Non-contingent reserve       $ 2,500,000 $ 2,500,000 $ 2,500,000    
Loan Sale and Freddie Mac Q Series Securitization | Mortgage-backed Securities, Purchased from Freddie Mac                
Loans and Allowance for Credit Losses on Loans                
Number of securities purchased | security       0        
Loan Sale and Freddie Mac Q Series Securitization | US Treasury Securities.                
Loans and Allowance for Credit Losses on Loans                
Purchases of available for sale securities       $ 27,000,000.0        
Multi-family and healthcare financing | Loan Sale and Freddie Mac Q Series Securitization                
Loans and Allowance for Credit Losses on Loans                
Amount of portfolio of loans sold in a securitization transaction $ 303,600,000              
Multi-family financing | Loan Sale and Freddie Mac Q Series Securitization                
Loans and Allowance for Credit Losses on Loans                
Amount of portfolio of loans sold in a securitization transaction $ 303,600,000 $ 284,200,000   $ 214,000,000.0        
Number of loans securitized | loan 11 16            
Loss on sale of loans $ 60,000              
Mortgage servicing right established $ 1,500,000              
Multi-family financing | Loan Sale and Securitization                
Loans and Allowance for Credit Losses on Loans                
Amount of portfolio of loans sold in a securitization transaction     $ 1,200,000,000          
Percentage of first loss position     13.40%          
Proceeds and accrued interest on loans, net of the acquired securities     $ 150,600,000          
Allowance for credit losses associated with loans sold released through the provision for credit losses     4,000,000.0          
Pricing loss     5,400,000          
Transaction expenses     4,900,000          
Capitalizing servicing rights     6,700,000          
Release of deferred fees on loans sold     3,200,000          
Gain on sale of loans     (525,000)          
Payments to held to maturity security     $ 1,000,000,000.0          
Residential real estate                
Loans and Allowance for Credit Losses on Loans                
Number of loans in the process of foreclosure | loan         0 0