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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, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Changes in fair value for financial assets [Abstract]          
Equity Securities at fair value, net gains (losses)     $ (170)    
Trading securities, net gains (losses)       $ (63)  
Loans held for sale, net gains (losses)     (120) 713  
Capitalized mortgage loan servicing rights, net gains (losses)     694 (2,585)  
Impairment charges recognized [Abstract]          
Collateral dependent loans, carrying amount $ 1,800   1,800   $ 1,900
Collateral dependent loans, valuation allowance 800   800   700
Additional provision for loan losses on impaired loans 100 $ 300 500 500  
Other real estate, carrying amount 100   100   300
Other real estate, valuation allowance 100   100   $ 100
Other real estate, additional charge $ 40 $ 30 40 40  
Securities [Member]          
Changes in fair value for financial assets [Abstract]          
Equity Securities at fair value, net gains (losses)     (170)    
Trading securities, net gains (losses)       (63)  
Mortgage Loans [Member]          
Changes in fair value for financial assets [Abstract]          
Loans held for sale, net gains (losses)     (120) 713  
Mortgage Loan Servicing, Net [Member]          
Changes in fair value for financial assets [Abstract]          
Capitalized mortgage loan servicing rights, net gains (losses)     $ 694 $ (2,585)