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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Impairment charges recognized [Abstract]          
Capitalized mortgage loan servicing rights, carrying amount         $ 8,200
Capitalized mortgage loan servicing rights, valuation allowance         2,300
Capitalized mortgage loan servicing rights   $ 600   $ (1,500)  
Collateral dependent loans, carrying amount $ 2,500   $ 2,500   4,000
Collateral dependent loans, valuation allowance 700   700   2,000
Additional provision for loan losses on impaired loans 300 100 500 300  
Other real estate, carrying amount 50   50   3,200
Other real estate, valuation allowance 80   80   $ 800
Other real estate, additional charge $ 30 $ 370 40 410  
Trading Securities [Member]          
Changes in fair value for financial assets [Abstract]          
Net Gains (Losses) on Assets     (63) 4  
Total Change in Fair Values Included in Current Period Earnings     (63) 4  
Loans Held For Sale [Member]          
Changes in fair value for financial assets [Abstract]          
Net Gains (Losses) on Assets     713 612  
Total Change in Fair Values Included in Current Period Earnings     713 $ 612  
Capitalized Mortgage Loan Servicing Rights [Member]          
Changes in fair value for financial assets [Abstract]          
Mortgage Loan Servicing, net     (2,585)    
Total Change in Fair Values Included in Current Period Earnings     $ (2,585)