Consolidated Statements of Comprehensive Income (Parentheticals) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Statement of Other Comprehensive Income [Abstract]
Unrealized gains on securities available for sale arising during the period, tax	$ 1,045	$ 1,728	$ 159
Unrealized gains (losses) on other-than-temporarily impaired securities available for sale arising during the period, tax	48	43	54
Reclassification adjustment for gain on securities available for sale included in net income, tax	208	1,033	841
Reclassification adjustment for credit related other-than-temporary impairment losses on securities available for sale included in net income, tax	11	235	150
Unrealized losses net of settlements on cash flow hedge arising during the period, tax	243	989	305
Net actuarial losses arising during period, tax	86	859	111
Amortization of prior service cost, tax	0	9	14
Amortization of actuarial loss, tax	$ 797	$ 367	$ 330