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Fair Value Disclosures, Changes in Fair Value for Financial Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Changes in fair value for financial assets [Abstract]          
Loans held for sale     $ (2,400) $ 1,387  
Capitalized mortgage loan servicing rights, net gains (losses)     (581) (11,641)  
Impairment charges recognized [Abstract]          
Collateral dependent loans, carrying amount $ 1,800   1,800   $ 9,100
Collateral dependent loans, valuation allowance 900   900   1,800
Additional provision for credit losses on collateral dependent loans 100 $ 3,400 100 5,500  
Other real estate, carrying amount 0   0   100
Other real estate, valuation allowance 60   60   $ 90
Other real estate, additional charge $ 0 $ 0 0 90  
Mortgage Loans [Member]          
Changes in fair value for financial assets [Abstract]          
Loans held for sale     (2,400) 1,387  
Mortgage Loan Servicing, Net [Member]          
Changes in fair value for financial assets [Abstract]          
Capitalized mortgage loan servicing rights, net gains (losses)     $ (581) $ (11,641)