Fair Value Disclosures, Part 2 (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Impairment charges recognized [Abstract]
Capitalized mortgage loan servicing rights, carrying amount	$ 7,900		$ 7,900		$ 9,200
Capitalized mortgage loan servicing rights, valuation allowance	4,100		4,100		3,800
Capitalized mortgage loan servicing rights, recovery (charges)	(900)	$ 500	(300)	$ 40
Collateral dependent loans, carrying amount	10,300		10,300		8,200
Collateral dependent loans, valuation allowance	3,800		3,800		3,100
Additional provision for loan losses on impaired loans	1,000	500	1,900	1,400
Other real estate, carrying amount	1,000		1,000		1,900
Other real estate, valuation allowance	1,700		1,700		$ 2,500
Other real estate, additional charge	$ 30	$ 300	300	400
Trading Securities [Member]
Changes in fair value for financial assets [Abstract]
Net Gains (Losses) on Assets			22	32
Total Change in Fair Values Included in Current Period Earnings			22	32
Loans Held For Sale [Member]
Changes in fair value for financial assets [Abstract]
Net Gains (Losses) on Assets			311	127
Total Change in Fair Values Included in Current Period Earnings			$ 311	$ 127