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Comprehensive Income (Accumulated Balances for Each Classification of Other Comprehensive Income) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended 3 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Unrealized (Gains) Losses on Securities [Member]
Mar. 31, 2013
Unrealized (Gains) Losses on Securities [Member]
Jun. 30, 2013
Pension and Postretirement Benefit Plans [Member]
Mar. 31, 2013
Pension and Postretirement Benefit Plans [Member]
Jun. 30, 2013
Interest Rate Swaps [Member]
Mar. 31, 2013
Interest Rate Swaps [Member]
Jun. 30, 2013
Accumulated Other Comprehensive Income (Loss) [Member]
Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Member]
Comprehensive Income [Line Items]                        
Balance     $ 2,215   $ 4,748 $ 6,033 $ (3,070) $ (3,130) $ (640) $ (688) $ 1,038 $ 2,215
Other comprehensive income before reclassifications, Unrealized (gains) losses on securities         (6,853) (1,285)            
Other comprehensive income before reclassifications, Pension and postretirement benefit plans             0 0        
Other comprehensive income before reclassifications, Interest rate swaps 118 2 166 82         118 48    
Other comprehensive income before reclassifications, Accumulated other comprehensive income (loss)                     (6,735) (1,237)
Reclassification adjustments for (gains) losses reclassified into income, Unrealized (gains) losses on securities 8 (241) 8 (291) 8 0            
Reclassification adjustments for (gains) losses reclassified into income, Pension and postretirement benefit plans             56 60        
Reclassification adjustments for (gains) losses reclassified into income, Interest rate swaps                 0 0    
Reclassification adjustments for (gains) losses reclassified into income, Accumulated other comprehensive income (loss)                     64 60
Net current period other comprehensive (loss) income, Unrealized (gains) losses on securities (6,853) (164) (8,138) 219 (6,845) (1,285)            
Net current period other comprehensive (loss) income, Pension and postretirement benefit plans 56 65 116 106     56 60        
Net current period other comprehensive (loss) income, Interest rate swaps                 118 48    
Net current period other comprehensive (loss) income, Accumulated other comprehensive income (loss)                     (6,671) (1,177)
Balance $ (5,633)   $ (5,633)   $ (2,097) $ 4,748 $ (3,014) $ (3,070) $ (522) $ (640) $ (5,633) $ 1,038