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Fair Value Disclosures, Changes in Fair Value for Financial Assets (Q3) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Impairment charges recognized [Abstract]                
Capitalized mortgage loan servicing rights, carrying amount         $ 8,200 $ 8,500    
Capitalized mortgage loan servicing rights, valuation allowance         2,306 3,272 $ 3,773  
Capitalized mortgage loan servicing rights   $ 600   $ (1,500) 1,000 500 (900)  
Collateral dependent loans, carrying amount $ 2,500   $ 2,500   4,000 5,100    
Collateral dependent loans, valuation allowance 700   700   2,000 2,500    
Additional provision for loan losses on impaired loans 300 100 500 300 200 1,100 2,100  
Other real estate, carrying amount 50   50   3,200 1,000    
Other real estate, valuation allowance 80   80   793 1,692 2,511 $ 4,047
Other real estate, additional charge $ 30 $ 370 40 410 600 300 300  
Trading Securities [Member]                
Changes in fair value for financial assets [Abstract]                
Net Gains (Losses) on Assets     (63) 4 262 (55) (295)  
Total Change in Fair Values Included in Current Period Earnings     (63) 4 262 (55) (295)  
Loans Held For Sale [Member]                
Changes in fair value for financial assets [Abstract]                
Net Gains (Losses) on Assets     713 612 (277) 90 258  
Total Change in Fair Values Included in Current Period Earnings     713 $ 612 $ (277) $ 90 $ 258  
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)