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Fair Value Measurements Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 12 Months Ended
Mar. 31, 2012
Dec. 31, 2012
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Equity Securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Equity Securities [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
U.S. Government Securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
U.S. Government Securities [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
U.S. Government-Sponsored Agency Securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
U.S. Government-Sponsored Agency Securities [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
State and Municipal Securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
State and Municipal Securities [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Corporate Debt Securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Corporate Debt Securities [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Collateralized Mortgage Obligations [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Collateralized Mortgage Obligations [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Mortgage Backed Securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Mortgage Backed Securities [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Auction Rate Securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Auction Rate Securities [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Equity Securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Equity Securities [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
U.S. Government Securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
U.S. Government Securities [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
U.S. Government-Sponsored Agency Securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
U.S. Government-Sponsored Agency Securities [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
State and Municipal Securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
State and Municipal Securities [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Corporate Debt Securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Corporate Debt Securities [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Collateralized Mortgage Obligations [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Collateralized Mortgage Obligations [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Mortgage Backed Securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Mortgage Backed Securities [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Auction Rate Securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Auction Rate Securities [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Equity Securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Equity Securities [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
U.S. Government Securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
U.S. Government Securities [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
U.S. Government-Sponsored Agency Securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
U.S. Government-Sponsored Agency Securities [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
State and Municipal Securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
State and Municipal Securities [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Corporate Debt Securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Corporate Debt Securities [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Collateralized Mortgage Obligations [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Collateralized Mortgage Obligations [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Mortgage Backed Securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Mortgage Backed Securities [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Auction Rate Securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Level 3 [Member]
Auction Rate Securities [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Total [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Total [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Total [Member]
Equity Securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Total [Member]
Equity Securities [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Total [Member]
U.S. Government Securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Total [Member]
U.S. Government Securities [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Total [Member]
U.S. Government-Sponsored Agency Securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Total [Member]
U.S. Government-Sponsored Agency Securities [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Total [Member]
State and Municipal Securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Total [Member]
State and Municipal Securities [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Total [Member]
Corporate Debt Securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Total [Member]
Corporate Debt Securities [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Total [Member]
Collateralized Mortgage Obligations [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Total [Member]
Collateralized Mortgage Obligations [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Total [Member]
Mortgage Backed Securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Total [Member]
Mortgage Backed Securities [Member]
Dec. 31, 2012
Fair Value, Measurements, Recurring [Member]
Total [Member]
Auction Rate Securities [Member]
Dec. 31, 2011
Fair Value, Measurements, Recurring [Member]
Total [Member]
Auction Rate Securities [Member]
Dec. 31, 2012
Trust for Benefit of Employees [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2011
Trust for Benefit of Employees [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2012
Foreign Exchange Contract [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2011
Foreign Exchange Contract [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2012
Forward Contracts [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2011
Forward Contracts [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2012
Interest Rate Swap [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2011
Interest Rate Swap [Member]
Fair Value, Measurements, Recurring [Member]
Level 2 [Member]
Dec. 31, 2012
Foreign Exchange Contract [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2011
Foreign Exchange Contract [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2012
Trust for Benefit of Employees [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Dec. 31, 2011
Trust for Benefit of Employees [Member]
Fair Value, Measurements, Recurring [Member]
Level 1 [Member]
Significant Input, Assumed Market Return to Liquidity, Years 3 years 5 years                                                                                                                                                                        
Mortgages loans held for sale     $ 0 $ 0                                 $ 67,899 $ 47,009                                 $ 0 $ 0                                 $ 67,899 $ 47,009                                                        
Available for sale investment securities     50,873 34,586 50,873 34,586 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2,511,536 2,321,748 0 0 325 334 2,397 4,073 315,519 322,018 102,555 114,017 1,211,119 1,001,209 879,621 880,097 0 0 159,626 234,500 0 0 0 0 0 0 0 0 10,287 9,289 0 0 0 0 149,339 225,211 2,722,035 2,590,834 50,873 34,586 325 334 2,397 4,073 315,519 322,018 112,842 123,306 1,211,119 1,001,209 879,621 880,097 149,339 225,211                        
Other finanical assets     15,259 13,130                                 14,710 3,901                                 0 0                                 29,969 17,031                                 14,100 13,100 1,200 2,200 7,600 3,900 7,100 2,700        
Total assets     66,132 47,716                                 2,594,145 2,372,658                                 159,626 234,500                                 2,819,903 2,654,874                                                        
Other financial liabilities     $ 15,524 $ 13,130                                 $ 8,161 $ 2,734                                 $ 0 $ 0                                 $ 23,685 $ 15,864                                         $ 1,100 $ 2,700 $ 7,100 $ 2,700 $ 1,400 $ 2,600 $ 14,100 $ 13,100