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Loans Held for Investment - TDRs (Details)
3 Months Ended
Mar. 31, 2023
USD ($)
loan
Mar. 31, 2022
USD ($)
contract
loan
TDRs, Non-covered loans    
Number of TDRs granted | loan   1
TDR at extension   $ 600,000
TDR modifications, end of period   600,000
Unadvanced commitments to borrowers   $ 0
Number of TDRs granted in preceding twelve months for which payment was at least 30 days past due | contract   0
Prime Lending    
TDRs, Non-covered loans    
Repurchase under a forbearance agreement $ 64,600,000  
AB Note | Minimum | Plains Capital Bank    
TDRs, Non-covered loans    
Number of loans into which a single loan may be reconfigured | loan 2