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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, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Changes in fair value for financial assets [Abstract]          
Equity Securities at fair value, net gains       $ 167  
Loans held for sale, net gains     $ 1,387 577  
Capitalized mortgage loan servicing rights, net gains (losses)     (11,641) (6,113)  
Impairment charges recognized [Abstract]          
Collateral dependent loans, carrying amount $ 17,400   17,400   $ 3,400
Collateral dependent loans, valuation allowance 3,400   3,400   1,500
Additional provision for loan losses on impaired loans 3,400 $ 300 5,500 400  
Other real estate, carrying amount 500   500   60
Other real estate, valuation allowance 160   160   $ 90
Other real estate, additional charge $ 0 $ 0 90 10  
Securities [Member]          
Changes in fair value for financial assets [Abstract]          
Equity Securities at fair value, net gains       167  
Mortgage Loans [Member]          
Changes in fair value for financial assets [Abstract]          
Loans held for sale, net gains     1,387 577  
Mortgage Loan Servicing, Net [Member]          
Changes in fair value for financial assets [Abstract]          
Capitalized mortgage loan servicing rights, net gains (losses)     $ (11,641) $ (6,113)