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Fair Value Measurements (Details 1) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Reconciliation for assets and liabilities measured at fair value on a recurring basis        
Beginning Balance $ 15,462 $ 29,383 $ 15,022 $ 31,274
Realized gains (losses) included in net income 0 82 14 (233)
Unrealized gains (losses) included in other comprehensive income 2,913 8,160 4,291 7,518
Reclassification adjustment      (952)  
Purchases          
Capitalization of interest        1,214
Additions through acquisition        1,194
Sales            
Issues            
Settlements    (695)    (4,037)
Transfers into Level 3            
Transfers out of Level 3 (3,033) (12,453) (3,033) (12,453)
Ending Balance 15,342 24,477 15,342 24,477
Trust preferred securities [Member]
       
Reconciliation for assets and liabilities measured at fair value on a recurring basis        
Beginning Balance 12,672 1,473 12,785 1,433
Realized gains (losses) included in net income 0 0    (256)
Unrealized gains (losses) included in other comprehensive income 2,670 8,513 3,509 7,595
Reclassification adjustment      (952)  
Purchases          
Capitalization of interest        1,214
Additions through acquisition          
Sales            
Issues            
Settlements            
Transfers into Level 3            
Transfers out of Level 3            
Ending Balance 15,342 9,986 15,342 9,986
Other equity securities [Member]
       
Reconciliation for assets and liabilities measured at fair value on a recurring basis        
Beginning Balance 2,790 27,910 2,237 29,841
Realized gains (losses) included in net income 0 82 14 23
Unrealized gains (losses) included in other comprehensive income 243 (353) 782 (77)
Reclassification adjustment          
Purchases          
Capitalization of interest          
Additions through acquisition        1,194
Sales            
Issues            
Settlements    (695)    (4,037)
Transfers into Level 3            
Transfers out of Level 3 (3,033) (12,453) (3,033) (12,453)
Ending Balance    $ 14,491    $ 14,491