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Borrowings - Notes payable (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Debt Instrument    
Notes payable $ 987,887 $ 988,563
Advances with FHLB with maturities ranging from 2022 Through 2029    
Debt Instrument    
FHLB advances 491,429 492,429
Unsecured senior debt | Fixed Rate with maturities on 2023 paying interest semiannually    
Debt Instrument    
Long Term Debt 298,159 297,842
Junior subordinated debt | Fixed Rate with maturities on 2034    
Debt Instrument    
Long Term Debt $ 198,299 $ 198,292