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Fair Value Disclosures, Changes in Fair Value for Financial Assets (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Changes in fair value for financial assets [Abstract]          
Loans held for sale     $ (2,299) $ 2,081  
Capitalized mortgage loan servicing rights, net gains (losses)     (1,333) (14,028)  
Impairment charges recognized [Abstract]          
Collateral dependent loans, carrying amount $ 1,700   1,700   $ 9,100
Collateral dependent loans, valuation allowance 900   900   1,800
Additional provision for credit losses on collateral dependent loans 200 $ 200 200 1,100  
Other real estate, carrying amount 0   0   100
Other real estate, valuation allowance 30   30   $ 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     (2,299) 2,081  
Mortgage Loan Servicing, Net [Member]          
Changes in fair value for financial assets [Abstract]          
Capitalized mortgage loan servicing rights, net gains (losses)     $ (1,333) $ (14,028)