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Fair Value Measurement of Assets and Liabilities - Additional Information (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2024
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Transfer of loans to loans held for sale, net $ 823,100 $ 823,091 $ 10,000 $ 10,000
Gain (loss) on sale of financing receivable (5,800)      
Allowance for credit loss, write-off   1,200   $ 4,200
Net loans 8,800 8,800    
Collateral dependent loans amortized cost 177,300 177,300    
Specific valuation allowance allocations $ 57,500 $ 57,500    
Discount adjustment of the appraisals of foreclosed assets 0.00% 0.00%   0.00%
Taxi Medallion Loan Portfolio        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Collateral dependent loans amortized cost $ 52,200 $ 52,200    
Fair Value | Significant Unobservable Inputs (Level 3)        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Net loans 47,796,832 47,796,832   $ 47,981,499
Fair Value | Non-recurring fair value measurements        
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]        
Reported net carrying amount of collateral dependent loans $ 119,800 $ 119,800