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Note 12 - Fair Value Measurements (Detail) - Fair value estimates for financial instruments, excluding financial instruments recorded at fair value on a recurring basis (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Carrying (Reported) Amount, Fair Value Disclosure [Member]
   
Cash and due from banks $ 491,382 $ 530,045
Investment securities held to maturity 1,156,041 922,803
Loans 2,081,123 2,491,209
Other assets - FDIC receivable 13,847 40,113
Financial Liabilities    
Deposits 4,232,492 4,249,921
Short-term borrowed funds 53,687 115,689
Federal Home Loan Bank advances 25,799 26,023
Term repurchase agreement 10,000 10,000
Debt financing 15,000 15,000
Estimate of Fair Value, Fair Value Disclosure [Member]
   
Cash and due from banks 491,382 530,045
Investment securities held to maturity 1,184,557 947,493
Loans 2,090,712 2,515,095
Other assets - FDIC receivable 13,834 40,046
Financial Liabilities    
Deposits 4,232,239 4,250,164
Short-term borrowed funds 53,687 115,689
Federal Home Loan Bank advances 26,150 26,532
Term repurchase agreement 10,135 10,242
Debt financing 15,645 15,222
Fair Value, Inputs, Level 1 [Member]
   
Cash and due from banks 491,382  
Investment securities held to maturity 3,275  
Financial Liabilities    
Federal Home Loan Bank advances 26,150  
Fair Value, Inputs, Level 2 [Member]
   
Investment securities held to maturity 1,181,282  
Financial Liabilities    
Deposits 3,589,921  
Short-term borrowed funds 53,687  
Term repurchase agreement 10,135  
Debt financing 15,645  
Fair Value, Inputs, Level 3 [Member]
   
Loans 2,090,712  
Other assets - FDIC receivable 13,834  
Financial Liabilities    
Deposits $ 642,318