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Fair Value Measurements (Details 5) - Non-recurring - USD ($)
$ in Thousands
3 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Impaired loans    
Fair value measurements    
Impairment charges $ 100  
Mortgage servicing rights    
Fair value measurements    
Impairment recoveries (220)  
Repossessions    
Fair value measurements    
Impairment charges 0  
Other real estate    
Fair value measurements    
Impairment charges 0  
Total    
Fair value measurements    
Impaired loans - collateral based 1,332 $ 11,991
Assets measured at fair value 6,541 18,130
Total | Mortgage servicing rights    
Fair value measurements    
Accrued income and other assets 4,519 3,804
Total | Repossessions    
Fair value measurements    
Accrued income and other assets 690 1,976
Total | Other real estate    
Fair value measurements    
Accrued income and other assets 0 359
Level 3    
Fair value measurements    
Impaired loans - collateral based 1,332 11,991
Assets measured at fair value 6,541 18,130
Level 3 | Mortgage servicing rights    
Fair value measurements    
Accrued income and other assets 4,519 3,804
Level 3 | Repossessions    
Fair value measurements    
Accrued income and other assets 690 1,976
Level 3 | Other real estate    
Fair value measurements    
Accrued income and other assets $ 0 $ 359