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FAIR VALUE OF FINANCIAL ASSETS AND LIABILITIES (Change in Level 3 Assets and Liabilities) (Details 3) - Mortgage revenue bonds
$ in Thousands
6 Months Ended
Jun. 30, 2021
USD ($)
security
Jun. 30, 2020
USD ($)
Dec. 31, 2020
Changes in Level 3 assets and liabilities measured at fair value on a recurring basis      
Aggregate fair value / Balance at the beginning of the period $ 12,326 $ 11,255  
Principal payments received (2,745) (212)  
Unrealized net loss included in other comprehensive income (671) 628  
Aggregate fair value / Balance at the end of the period 8,910 11,671  
States and political subdivisions      
Changes in Level 3 assets and liabilities measured at fair value on a recurring basis      
Aggregate fair value / Balance at the beginning of the period 11,337 11,255  
Principal payments received (2,734) (212)  
Unrealized net loss included in other comprehensive income (633) 628  
Aggregate fair value / Balance at the end of the period $ 7,970 11,671  
Additional disclosures      
Number of investment securities held | security 2    
Residential - Non-government agencies      
Changes in Level 3 assets and liabilities measured at fair value on a recurring basis      
Aggregate fair value / Balance at the beginning of the period $ 989 0  
Principal payments received (11) 0  
Unrealized net loss included in other comprehensive income (38) 0  
Aggregate fair value / Balance at the end of the period $ 940 $ 0  
Additional disclosures      
Number of investment securities held | security 2    
Measurement Input, Discount Rate | Weighted average      
Additional disclosures      
Weighted average prepayment speed assumption 0.0319 0.0282 0.0283