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Borrowings - Notes payable (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
Notes payable $ 896,293 $ 986,948
Advances with FHLB with maturities ranging from 2025 Through 2029    
Debt Instrument [Line Items]    
FHLB advances 302,722 394,665
Unsecured senior debt | Fixed Rate maturing on 2028 paying interest semiannually    
Debt Instrument [Line Items]    
Notes payable 395,198 393,937
Junior subordinated debt | Fixed Rate maturing on 2034    
Debt Instrument [Line Items]    
Notes payable $ 198,373 $ 198,346