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Derivatives and Hedging Activities - Narrative (Details) - USD ($)
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2022
Dec. 31, 2024
Derivative [Line Items]            
Floating rate percentage         4.00%  
Addition to interest income     $ 5,000      
Collateral already posted, fair value $ 0   0     $ 0
Collateral received from third parties 47,200,000   47,200,000     93,300,000
Credit risk derivative liability, fair value 56,449,000   56,449,000     $ 91,483,000
Interest Rate Swap            
Derivative [Line Items]            
Losses from fair value adjustments $ 3,000 $ 25,000 $ 28,000 $ 14,000    
Derivative term         3 years