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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, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 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   $ 2,100  
Collateral dependent loans, carrying amount $ 2,600   $ 2,600   4,000
Collateral dependent loans, valuation allowance 700   700   2,000
Additional provision for loan losses on impaired loans 100 (100) 300 300  
Other real estate, carrying amount 200   200   3,200
Other real estate, valuation allowance 100   100   $ 800
Other real estate, additional charge $ 30 $ 40 40 60  
Trading Securities [Member]          
Changes in fair value for financial assets [Abstract]          
Net Gains (Losses) on Assets     (124) 64  
Total Change in Fair Values Included in Current Period Earnings     (124) 64  
Loans Held For Sale [Member]          
Changes in fair value for financial assets [Abstract]          
Net Gains (Losses) on Assets     666 478  
Total Change in Fair Values Included in Current Period Earnings     666 $ 478  
Capitalized Mortgage Loan Servicing Rights [Member]          
Changes in fair value for financial assets [Abstract]          
Mortgage Loan Servicing, net     (1,495)    
Total Change in Fair Values Included in Current Period Earnings     $ (1,495)