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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Changes in fair value for financial assets [Abstract]          
Equity Securities at fair value, net gains (losses)     $ 167 $ (170)  
Loans held for sale, net gains (losses)     822 (120)  
Capitalized mortgage loan servicing rights, net gains (losses)     (9,258) 694  
Impairment charges recognized [Abstract]          
Collateral dependent loans, carrying amount $ 2,200   2,200   $ 3,500
Collateral dependent loans, valuation allowance 900   900   1,500
Additional provision for loan losses on impaired loans 500 $ 100 800 500  
Other real estate, carrying amount 100   100   200
Other real estate, valuation allowance 100   100   $ 100
Other real estate, additional charge $ 70 $ 40 80 40  
Securities [Member]          
Changes in fair value for financial assets [Abstract]          
Equity Securities at fair value, net gains (losses)     167 (170)  
Mortgage Loans [Member]          
Changes in fair value for financial assets [Abstract]          
Loans held for sale, net gains (losses)     822 (120)  
Mortgage Loan Servicing, Net [Member]          
Changes in fair value for financial assets [Abstract]          
Capitalized mortgage loan servicing rights, net gains (losses)     $ (9,258) $ 694