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Fair Value Measurements Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) (Fair Value, Measurements, Recurring [Member], USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Level 1 [Member]
    
Mortgages Held-for-sale, Fair Value Disclosure $ 0 $ 0
Available-for-sale Securities, Fair Value Disclosure 33,430 34,586
Other Assets, Fair Value Disclosure 14,382 13,130
Assets, Fair Value Disclosure 47,812 47,716
Liabilities, Fair Value Disclosure 14,382 13,130
Level 1 [Member] | Equity Securities [Member]
    
Available-for-sale Securities, Fair Value Disclosure 33,430 34,586
Level 1 [Member] | U.S. Government Securities [Member]
    
Available-for-sale Securities, Fair Value Disclosure 0 0
Level 1 [Member] | U.S. Government-Sponsored Agency Securities [Member]
    
Available-for-sale Securities, Fair Value Disclosure 0  
Level 1 [Member] | US Treasury and Government [Member]
    
Available-for-sale Securities, Fair Value Disclosure   0
Level 1 [Member] | State and Municipal Securities [Member]
    
Available-for-sale Securities, Fair Value Disclosure 0 0
Level 1 [Member] | Corporate Debt Securities [Member]
    
Available-for-sale Securities, Fair Value Disclosure 0 0
Level 1 [Member] | Collateralized Mortgage Obligations [Member]
    
Available-for-sale Securities, Fair Value Disclosure 0 0
Level 1 [Member] | Mortgage-Backed Securities [Member]
    
Available-for-sale Securities, Fair Value Disclosure 0 0
Level 1 [Member] | Auction Rate Securities [Member]
    
Available-for-sale Securities, Fair Value Disclosure 0 0
Level 2 [Member]
    
Mortgages Held-for-sale, Fair Value Disclosure 70,128 47,009
Available-for-sale Securities, Fair Value Disclosure 2,736,381 2,321,748
Other Assets, Fair Value Disclosure 5,450 3,901
Assets, Fair Value Disclosure 2,811,959 2,372,658
Liabilities, Fair Value Disclosure 128 2,734
Level 2 [Member] | Equity Securities [Member]
    
Available-for-sale Securities, Fair Value Disclosure 0 0
Level 2 [Member] | U.S. Government Securities [Member]
    
Available-for-sale Securities, Fair Value Disclosure 330 334
Level 2 [Member] | U.S. Government-Sponsored Agency Securities [Member]
    
Available-for-sale Securities, Fair Value Disclosure 4,050  
Level 2 [Member] | US Treasury and Government [Member]
    
Available-for-sale Securities, Fair Value Disclosure   4,073
Level 2 [Member] | State and Municipal Securities [Member]
    
Available-for-sale Securities, Fair Value Disclosure 310,632 322,018
Level 2 [Member] | Corporate Debt Securities [Member]
    
Available-for-sale Securities, Fair Value Disclosure 118,158 114,017
Level 2 [Member] | Collateralized Mortgage Obligations [Member]
    
Available-for-sale Securities, Fair Value Disclosure 1,096,585 1,001,209
Level 2 [Member] | Mortgage-Backed Securities [Member]
    
Available-for-sale Securities, Fair Value Disclosure 1,206,626 880,097
Level 2 [Member] | Auction Rate Securities [Member]
    
Available-for-sale Securities, Fair Value Disclosure 0 0
Level 3 [Member]
    
Mortgages Held-for-sale, Fair Value Disclosure 0 0
Available-for-sale Securities, Fair Value Disclosure 233,299 234,500
Other Assets, Fair Value Disclosure 0 0
Assets, Fair Value Disclosure 233,299 234,500
Liabilities, Fair Value Disclosure 0 0
Level 3 [Member] | Equity Securities [Member]
    
Available-for-sale Securities, Fair Value Disclosure 0 0
Level 3 [Member] | U.S. Government Securities [Member]
    
Available-for-sale Securities, Fair Value Disclosure 0 0
Level 3 [Member] | U.S. Government-Sponsored Agency Securities [Member]
    
Available-for-sale Securities, Fair Value Disclosure 0  
Level 3 [Member] | US Treasury and Government [Member]
    
Available-for-sale Securities, Fair Value Disclosure   0
Level 3 [Member] | State and Municipal Securities [Member]
    
Available-for-sale Securities, Fair Value Disclosure 0 0
Level 3 [Member] | Corporate Debt Securities [Member]
    
Available-for-sale Securities, Fair Value Disclosure 9,422 9,289
Level 3 [Member] | Collateralized Mortgage Obligations [Member]
    
Available-for-sale Securities, Fair Value Disclosure 0 0
Level 3 [Member] | Mortgage-Backed Securities [Member]
    
Available-for-sale Securities, Fair Value Disclosure 0 0
Level 3 [Member] | Auction Rate Securities [Member]
    
Available-for-sale Securities, Fair Value Disclosure 223,877 225,211
Total [Member]
    
Mortgages Held-for-sale, Fair Value Disclosure 70,128 47,009
Available-for-sale Securities, Fair Value Disclosure 3,003,110 2,590,834
Other Assets, Fair Value Disclosure 19,832 17,031
Assets, Fair Value Disclosure 3,093,070 2,654,874
Liabilities, Fair Value Disclosure 14,510 15,864
Total [Member] | Equity Securities [Member]
    
Available-for-sale Securities, Fair Value Disclosure 33,430 34,586
Total [Member] | U.S. Government Securities [Member]
    
Available-for-sale Securities, Fair Value Disclosure 330 334
Total [Member] | U.S. Government-Sponsored Agency Securities [Member]
    
Available-for-sale Securities, Fair Value Disclosure 4,050  
Total [Member] | US Treasury and Government [Member]
    
Available-for-sale Securities, Fair Value Disclosure   4,073
Total [Member] | State and Municipal Securities [Member]
    
Available-for-sale Securities, Fair Value Disclosure 310,632 322,018
Total [Member] | Corporate Debt Securities [Member]
    
Available-for-sale Securities, Fair Value Disclosure 127,580 123,306
Total [Member] | Collateralized Mortgage Obligations [Member]
    
Available-for-sale Securities, Fair Value Disclosure 1,096,585 1,001,209
Total [Member] | Mortgage-Backed Securities [Member]
    
Available-for-sale Securities, Fair Value Disclosure 1,206,626 880,097
Total [Member] | Auction Rate Securities [Member]
    
Available-for-sale Securities, Fair Value Disclosure $ 223,877 $ 225,211