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Loans and Allowance for Credit Losses on Loans - Narrative (Details)
6 Months Ended
May 05, 2022
USD ($)
security
May 07, 2021
USD ($)
security
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Loans and Leases Receivable Disclosure [Line Items]          
Proceeds from sale of loans receivable       $ 262,086,000  
Purchases of available for sale securities     $ 47,866,000 130,204,000  
Servicing rights     130,710,000   $ 110,348,000
Purchase of loans     $ 92,533,000 $ 250,678,000  
Loan Sale and Freddie Mac Q Series Securitization          
Loans and Leases Receivable Disclosure [Line Items]          
Net gain (loss) on sale of loans $ 2,300,000 $ (676,000)      
First loss position in loan portfolio, maximum securitization pool, percentage 12.00% 10.00%      
First loss position in loan portfolio, maximum securitization pool, amount $ 25,700,000 $ 26,200,000      
First loss position in loan portfolio, reserves for losses 1,200,000 1,400,000      
Servicing rights 1,200,000 $ 730,000      
Loan Sale and Freddie Mac Q Series Securitization | Other liabilities          
Loans and Leases Receivable Disclosure [Line Items]          
Non-contingent reserve $ 2,500,000        
Loan Sale and Freddie Mac Q Series Securitization | Mortgage-backed Securities, Purchased from Freddie Mac          
Loans and Leases Receivable Disclosure [Line Items]          
Number of securities purchased | security 0 2      
Purchases of available for sale securities   $ 28,700,000      
Loan Sale and Freddie Mac Q Series Securitization | US Treasury Securities.          
Loans and Leases Receivable Disclosure [Line Items]          
Purchases of available for sale securities $ 27,000,000.0        
Multi-family financing | Loan Sale and Freddie Mac Q Series Securitization          
Loans and Leases Receivable Disclosure [Line Items]          
Proceeds from sale of loans receivable $ 214,000,000.0 $ 262,000,000.0