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Fair Value Measurements (Details 5) - Non-recurring - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Impaired loans    
Fair value measurements    
Impairment charges (recoveries) $ 4,290 $ 12,460
Mortgage servicing rights    
Fair value measurements    
Impairment charges (recoveries) 0 0
Repossessions    
Fair value measurements    
Impairment charges (recoveries) 2,250 1,920
Other real estate    
Fair value measurements    
Impairment charges (recoveries) 0 0
Total    
Fair value measurements    
Impaired loans - collateral based 8,492 7,306
Assets measured at fair value 21,837 18,554
Total | Mortgage servicing rights    
Fair value measurements    
Accrued income and other assets 4,200 4,283
Total | Repossessions    
Fair value measurements    
Accrued income and other assets 8,623 6,666
Total | Other real estate    
Fair value measurements    
Accrued income and other assets 522 299
Level 3    
Fair value measurements    
Impaired loans - collateral based 8,492 7,306
Assets measured at fair value 21,837 18,554
Level 3 | Mortgage servicing rights    
Fair value measurements    
Accrued income and other assets 4,200 4,283
Level 3 | Repossessions    
Fair value measurements    
Accrued income and other assets 8,623 6,666
Level 3 | Other real estate    
Fair value measurements    
Accrued income and other assets $ 522 $ 299