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Borrowings - Notes payable (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Debt Instrument [Line Items]    
Notes payable $ 789,954 $ 896,293
Advances with FHLB with maturities ranging from 2025 Through 2029    
Debt Instrument [Line Items]    
FHLB advances 195,312 302,722
Unsecured senior debt | Fixed Rate maturing on 2028 paying interest semiannually    
Debt Instrument [Line Items]    
Long Term Debt 396,249 395,198
Junior subordinated debt | Fixed Rate maturing on 2034    
Debt Instrument [Line Items]    
Long Term Debt $ 198,393 $ 198,373