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Fair Value Disclosures, Part 2 (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Impairment charges recognized [Abstract]      
Capitalized mortgage loan servicing rights, carrying amount $ 10,500   $ 8,500
Capitalized mortgage loan servicing rights, valuation allowance 4,700   3,300
Capitalized mortgage loan servicing rights 1,500 $ 700  
Collateral dependent loans, carrying amount 5,300   5,100
Collateral dependent loans, valuation allowance 2,700   2,500
Additional provision for loan losses on impaired loans 600 600  
Other real estate, carrying amount 700   1,000
Other real estate, valuation allowance 1,700   $ 1,700
Other real estate, additional charge 200 200  
Trading Securities [Member]      
Changes in fair value for financial assets [Abstract]      
Net Gains (Losses) on Assets (12) 10  
Total Change in Fair Values Included in Current Period Earnings (12) 10  
Loans Held For Sale [Member]      
Changes in fair value for financial assets [Abstract]      
Net Gains (Losses) on Assets 127 209  
Total Change in Fair Values Included in Current Period Earnings $ 127 $ 209