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Fair Value Disclosures, Changes in Fair Value for Financial Assets (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2017
Mar. 31, 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   $ 1,500  
Collateral dependent loans, carrying amount $ 2,600   4,000
Collateral dependent loans, valuation allowance 700   2,000
Additional provision for loan losses on impaired loans 300 600  
Other real estate, carrying amount 3,200   3,200
Other real estate, valuation allowance 700   $ 800
Other real estate, additional charge 20 170  
Trading Securities [Member]      
Changes in fair value for financial assets [Abstract]      
Net Gains (Losses) on Assets (79) (12)  
Total Change in Fair Values Included in Current Period Earnings (79) (12)  
Capitalized Mortgage Loan Servicing Rights [Member]      
Changes in fair value for financial assets [Abstract]      
Mortgage Loan Servicing, net (264)    
Total Change in Fair Values Included in Current Period Earnings (264)    
Loans Held For Sale [Member]      
Changes in fair value for financial assets [Abstract]      
Net Gains (Losses) on Assets 581 127  
Total Change in Fair Values Included in Current Period Earnings $ 581 $ 127