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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, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2015
Impairment charges recognized [Abstract]          
Capitalized mortgage loan servicing rights, carrying amount $ 10,700   $ 10,700   $ 8,500
Capitalized mortgage loan servicing rights, valuation allowance 4,700   4,700   3,300
Capitalized mortgage loan servicing rights 600 $ (900) (1,500) $ (300)  
Collateral dependent loans, carrying amount 4,400   4,400   5,100
Collateral dependent loans, valuation allowance 2,000   2,000   2,500
Additional provision for loan losses on impaired loans 100 1,000 300 1,900  
Other real estate, carrying amount 3,200   3,200   1,000
Other real estate, valuation allowance 600   600   $ 1,700
Other real estate, additional charge $ 370 $ 30 410 300  
Trading Securities [Member]          
Changes in fair value for financial assets [Abstract]          
Net Gains (Losses) on Assets     4 22  
Total Change in Fair Values Included in Current Period Earnings     4 22  
Loans Held For Sale [Member]          
Changes in fair value for financial assets [Abstract]          
Net Gains (Losses) on Assets     612 311  
Total Change in Fair Values Included in Current Period Earnings     $ 612 $ 311