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Defined Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2012
Compensation and Retirement Disclosure [Abstract]  
Schedule of Net Periodic Benefit Cost
The following amounts relate to the above plans in aggregate for the three and six months ended June 30, 2012, and 2011:
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2012
 
2011
 
2012
 
2011
 
(dollars in thousands)
Components of net periodic benefit cost included in employee compensation and benefits
 
 
 
 
 
 
 
Service cost
$
—

 
$
—

 
$
—

 
$
—

Interest cost
53

 
66

 
106

 
138

Expected return on plan assets
(59
)
 
(65
)
 
(116
)
 
(136
)
Amortization of (loss) / gain
—

 
—

 
—

 
—

Amortization of prior service cost
5

 
5

 
10

 
10

Effect of settlement
(1
)
 
(18
)
 
(3
)
 
(31
)
Net periodic benefit cost
$
(2
)
 
$
(12
)
 
$
(3
)
 
$
(19
)