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FAIR VALUE - Summary of assets measured at fair value on recurring basis (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Guarantee asset    
Fair Value, Asset, Recurring Basis, Unobservable Input Reconciliation, Gain (Loss), Statement of Income or Comprehensive Income [Extensible Enumeration] Net income available for common shareholders Net income available for common shareholders
Corporate bonds    
Guarantee asset    
Unrealized gains, net   $ 102
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | Loans Held at Fair Value    
Guarantee asset    
Balance at beginning of period $ 23,321  
Loans acquired 1,162 6,380
Losses in net income, net (150)  
Settlements (3,526)  
Balance at end of period 20,807 6,380
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | Guarantee Asset    
Guarantee asset    
Balance at beginning of period 143 237
Loans transferred from held for investment (5)  
Losses in net income, net 87 (31)
Balance at end of period 235 206
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | Corporate bonds    
Guarantee asset    
Balance at beginning of period   2,113
Loans acquired   4,000
Balance at end of period 0 6,215
Significant Unobservable Inputs (Level 3) | Fair Value, Recurring | Forward commitments and FSC    
Guarantee asset    
Balance at beginning of period   (9)
Loans acquired   9
Balance at end of period $ 0 $ 0