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Fair Value Measurement Of Assets And Liabilities (Changes In Level 3 Assets Measured At Fair Value On A Recurring Basis) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Transfers from held-to-maturity $ 18,300  
Trading Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Balance, beginning of the period 21,903 32,950
Transfers from held-to-maturity    [1]  
Total net (losses) gains for the period included in net income    (480)
Total net (losses) gains for the period included in other comprehensive income     
Purchases     
Settlements     
Balance, end of the period    21,903
Net unrealized (losses) gains included in net income for the period relating to assets held at year end    [2] (480) [2],[3]
Available For Sale Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Balance, beginning of the period 138,655 156,612
Transfers from held-to-maturity 23,452 [1]  
Total net (losses) gains for the period included in net income (1,654)  
Total net (losses) gains for the period included in other comprehensive income 765 9,626
Purchases   3,517
Settlements (8,270) (29,716)
Balance, end of the period 77,311 138,655
Net unrealized (losses) gains included in net income for the period relating to assets held at year end (19,968) [2],[4] (4,642) [2],[4]
Residential Mortgage-Backed Securities [Member] | Trading Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Transfers into Level 3     
Transfers out of Level 3     
Residential Mortgage-Backed Securities [Member] | Available For Sale Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Transfers into Level 3 8,798  
Transfers out of Level 3 (44,771)  
Trust Preferred Securities [Member] | Trading Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Transfers out of Level 3 (21,903) (10,567)
Trust Preferred Securities [Member] | Available For Sale Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Transfers out of Level 3 (17,397) (532)
Corporate And Other Debt Securities [Member] | Trading Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Transfers out of Level 3     
Corporate And Other Debt Securities [Member] | Available For Sale Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Transfers out of Level 3 (12,914) (852)
Equity Securities [Member] | Trading Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Transfers out of Level 3     
Equity Securities [Member] | Available For Sale Securities [Member]
   
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Transfers out of Level 3 $ (9,353)  
[1] Represents impaired trust preferred securities issued by one bank holding company transferred at fair value from held-to-maturity to available-for-sale at December 31, 2011.
[2] Represents net losses that are due to changes in economic conditions and management's estimates of fair value.
[3] Included in trading gains (losses), net within the non-interest income category on the consolidated statements of income.
[4] Represents the net impairment losses on securities recognized in earnings for the period, including $18.3 million related to trust preferred securities transferred from held-to-maturity at December 31, 2011.