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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
9 Months Ended
Sep. 30, 2020
USD ($)
security
Sep. 30, 2019
USD ($)
Dec. 31, 2019
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 $ 11,255 $ 11,169  
Principal payments received (319) (285)  
Unrealized net gain included in other comprehensive income 598 618  
Purchases 994 0  
Aggregate fair value / Balance at the end of the period 12,528 11,502  
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 11,255 11,169  
Principal payments received (319) (285)  
Unrealized net gain included in other comprehensive income 598 618  
Purchases 0 0  
Aggregate fair value / Balance at the end of the period $ 11,534 11,502  
Additional disclosures      
Number of investment securities held | security 4    
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 $ 0 0  
Principal payments received 0 0  
Unrealized net gain included in other comprehensive income 0 0  
Purchases 994 0  
Aggregate fair value / Balance at the end of the period $ 994 $ 0  
Additional disclosures      
Number of investment securities held | security 2    
Measurement Input, Discount Rate | Weighted average      
Additional disclosures      
Forecasted constant prepayment rate assumption (1) 0.0279 0.0394 0.0408