Accumulated Other Comprehensive Income (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Securities available-for-sale:
Net securities gains reclassified into earnings	$ (16)	$ (100)
Related income tax expense	6	37
Net effect on accumulated other comprehensive income for the period	(10)	(63)
Securities held-to-maturity:
Amortization of unrealized gain transferred from available-for-sale	(288)	(426)
Related income tax expense	111	168
Net effect on accumulated other comprehensive income for the period	(177)	(258)
Defined benefit pension plan :
Amortization of net loss and prior service costs	834	580
Related income tax expense	(359)	(271)
Net effect on accumulated other comprehensive income for the period	475	309
Total reclassifications for the period	$ 288	$ (12)