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Defined Benefit Plans - Net Periodic Benefit Cost (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended 3 Months Ended 6 Months Ended
Sep. 30, 2012
Defined SERP [Member]
Sep. 30, 2011
Defined SERP [Member]
Sep. 30, 2012
Defined SERP [Member]
Sep. 30, 2011
Defined SERP [Member]
Jun. 30, 2012
Directors Plan [Member]
Jun. 30, 2011
Directors Plan [Member]
Jun. 30, 2012
Directors Plan [Member]
Jun. 30, 2011
Directors Plan [Member]
Net Periodic Benefit Cost                
Service cost $ 38 $ 41 $ 115 $ 121 $ 7 $ 7 $ 20 $ 21
Interest cost 51 57 152 168 10 11 30 33
Amortization of gains (losses) 12   34          
Amortization of prior service cost 33 34 100 100 22 22 67 66
Net periodic cost $ 134 $ 131 $ 401 $ 388 $ 39 $ 40 $ 117 $ 120