Retirement Plans and Other Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2013

Compensation And Retirement Disclosure [Abstract]

Components of Net Periodic Benefit Cost

Components of net periodic benefit cost were as follows:

	Three Months Ended June 30,
	2013			2012			2013			2012
(Dollars in thousands)	Retirement Plans						Other Post Retirement Benefits
Service cost	$	155		$	155		$	25		$	20
Interest cost		426			432			27			29
Expected return on plan assets		(709	)		(637	)		—			—
Amortization of net loss		343			287			6			5
Accretion of prior service cost		(59	)		(59	)		(4	)		(5	)
Net periodic benefit cost	$	156		$	178		$	54		$	49

	Six Months Ended June 30,
	2013			2012			2013			2012
(Dollars in thousands)	Retirement Plans						Other Post Retirement Benefits
Service cost	$	311		$	313		$	46		$	41
Interest cost		857			863			56			59
Expected return on plan assets		(1,264	)		(1,128	)		—			—
Amortization of net loss		629			578			12			11
Accretion of prior service cost		(118	)		(118	)		(9	)		(10	)
Net periodic benefit cost	$	415		$	508		$	105		$	101