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FAIR VALUE OF FINANCIAL INSTRUMENTS (Qualitative Information for Assets and Liabilities) (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Fair Value        
Investment securities available-for-sale $ 880,338   $ 510,713  
Servicing assets 49,446 $ 47,911 48,973 $ 47,295
Other repossessed assets $ 2,625   $ 1,945  
Minimum        
Unobservable Input        
Constant prepayment rate 3.88% 4.50%    
Maximum        
Unobservable Input        
Constant prepayment rate 24.30% 40.50%    
Level 3 | Cash flow valuation | Other debt securities available for sale        
Fair Value        
Investment securities available-for-sale $ 1,554      
Level 3 | Cash flow valuation | Other debt securities available for sale | Recovery Rate        
Unobservable Input        
Other debt securities, measurement input 0.3473      
Level 3 | Cash flow valuation | Servicing Assets        
Fair Value        
Servicing assets $ 49,446      
Level 3 | Cash flow valuation | Minimum | Other debt securities available for sale        
Unobservable Input        
Credit rating Baa1      
Level 3 | Cash flow valuation | Minimum | Other debt securities available for sale | Probability of Default Rate        
Unobservable Input        
Other debt securities, measurement input 0.0016      
Level 3 | Cash flow valuation | Minimum | Servicing Assets        
Unobservable Input        
Constant prepayment rate 3.88%      
Discount rate 10.00%      
Level 3 | Cash flow valuation | Maximum | Other debt securities available for sale        
Unobservable Input        
Credit rating Baa3      
Level 3 | Cash flow valuation | Maximum | Other debt securities available for sale | Probability of Default Rate        
Unobservable Input        
Other debt securities, measurement input 0.0228      
Level 3 | Cash flow valuation | Maximum | Servicing Assets        
Unobservable Input        
Constant prepayment rate 24.30%      
Discount rate 15.50%      
Level 3 | Cash flow valuation | Weighted Average | Other debt securities available for sale        
Unobservable Input        
Credit rating Baa2      
Level 3 | Cash flow valuation | Weighted Average | Other debt securities available for sale | Probability of Default Rate        
Unobservable Input        
Other debt securities, measurement input 0.0033      
Level 3 | Cash flow valuation | Weighted Average | Other debt securities available for sale | Recovery Rate        
Unobservable Input        
Other debt securities, measurement input 0.3473      
Level 3 | Cash flow valuation | Weighted Average | Servicing Assets        
Unobservable Input        
Constant prepayment rate 5.97%      
Discount rate 11.46%      
Level 3 | Fair value of property or collateral | Collateralized loan obligations        
Fair Value        
Collateral dependent loans $ 21,279      
Level 3 | Fair value of property or collateral | Foreclosed real estate        
Fair Value        
Foreclosed real estate 15,297      
Level 3 | Fair value of property or collateral | Other repossessed assets        
Fair Value        
Other repossessed assets $ 2,625      
Level 3 | Fair value of property or collateral | Minimum | Collateralized loan obligations        
Unobservable Input        
Appraised value less disposition costs 10.20%      
Level 3 | Fair value of property or collateral | Minimum | Foreclosed real estate        
Unobservable Input        
Appraised value less disposition costs 10.20%      
Level 3 | Fair value of property or collateral | Minimum | Other repossessed assets        
Unobservable Input        
Estimated net realizable value less disposition costs 26.00%      
Level 3 | Fair value of property or collateral | Maximum | Collateralized loan obligations        
Unobservable Input        
Appraised value less disposition costs 30.20%      
Level 3 | Fair value of property or collateral | Maximum | Foreclosed real estate        
Unobservable Input        
Appraised value less disposition costs 30.20%      
Level 3 | Fair value of property or collateral | Maximum | Other repossessed assets        
Unobservable Input        
Estimated net realizable value less disposition costs 82.00%      
Level 3 | Fair value of property or collateral | Weighted Average | Collateralized loan obligations        
Unobservable Input        
Appraised value less disposition costs 17.20%      
Level 3 | Fair value of property or collateral | Weighted Average | Foreclosed real estate        
Unobservable Input        
Appraised value less disposition costs 11.79%      
Level 3 | Fair value of property or collateral | Weighted Average | Other repossessed assets        
Unobservable Input        
Estimated net realizable value less disposition costs 56.16%