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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
3 Months Ended
Mar. 31, 2021
USD ($)
security
Mar. 31, 2020
USD ($)
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 (1,978) (109)  
Unrealized net loss included in other comprehensive income (752) 426  
Aggregate fair value / Balance at the end of the period 9,596 11,572  
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 (1,973) (109)  
Unrealized net loss included in other comprehensive income (673) 426  
Aggregate fair value / Balance at the end of the period $ 8,691 11,572  
Additional disclosures      
Number of investment securities held | security 3    
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 (5) 0  
Unrealized net loss included in other comprehensive income (79) 0  
Aggregate fair value / Balance at the end of the period $ 905 $ 0  
Additional disclosures      
Number of investment securities held | security 2    
Measurement Input, Discount Rate | Weighted average      
Additional disclosures      
Weighted average prepayment speed assumption 0.0338 0.0325 0.0283