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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, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Changes in fair value for financial assets [Abstract]          
Equity Securities at fair value, net gains (losses)     $ (119)    
Trading securities, net gains (losses)       $ (124)  
Loans held for sale, net gains (losses)     367 666  
Capitalized mortgage loan servicing rights, net gains (losses)     892 (1,495)  
Impairment charges recognized [Abstract]          
Collateral dependent loans, carrying amount $ 2,700   2,700   $ 2,600
Collateral dependent loans, valuation allowance 900   900   700
Additional provision for loan losses on impaired loans 500 $ 100 500 300  
Other real estate, carrying amount 100   100   300
Other real estate, valuation allowance 100   100   $ 100
Other real estate, additional charge $ 0 $ 30 0 40  
Securities [Member]          
Changes in fair value for financial assets [Abstract]          
Equity Securities at fair value, net gains (losses)     (119)    
Trading securities, net gains (losses)       (124)  
Mortgage Loans [Member]          
Changes in fair value for financial assets [Abstract]          
Loans held for sale, net gains (losses)     367 666  
Mortgage Loan Servicing [Member]          
Changes in fair value for financial assets [Abstract]          
Capitalized mortgage loan servicing rights, net gains (losses)     $ 892 $ (1,495)