Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2013

Benefit plans

Schedule of components of net periodic benefit cost

	Three Months Ended March 31,
	2013		2012
	(Dollars in thousands)
Components of net periodic benefit cost:
Service cost	$	304	$	294
Interest cost		196		193
Amortization of prior service cost		—		7
Amortization of net actuarial loss		71		63
Net periodic benefit cost	$	571	$	557

Schedule of funded status of split-dollar life insurance benefits

	March 31, 2013		December 31, 2012
	(Dollars in thousands)
Change in projected benefit obligation
Projected benefit obligation at beginning of year	$	4,717	$	4,525
Interest cost		44		185
Actuarial gain		3		7
Projected benefit obligation at end of period	$	4,764	$	4,717

Schedule of amounts recognized in accumulated other comprehensive income

	March 31, 2013		December 31, 2012
	(Dollars in thousands)
Net actuarial loss	$	669	$	624
Prior transition obligation		1,665		1,685
Accumulated other comprehensive loss	$	2,334	$	2,309