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Fair Value Part 3 (Details) (USD $)
9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Apr. 15, 2011
Dec. 31, 2010
Fair Values, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Securities available for sale$ 2,476,905,000  $ 2,177,249,000
Securities held to maturity71,046,000  140,847,000
Loans held for sale210,269,000  153,044,000
Net LHFI, excluding covered loans5,694,249,000  5,966,732,000
Covered loans79,064,000  0
FDIC indemnification asset33,436,000 33,333,0000
Other assets - derivatives3,061,000  (2,247,000)
Deposits7,569,724,000  7,044,567,000
Long-term FHLB advances741,000  0
Subordinated notes49,831,000  49,806,000
Junior subordinated debt securities61,856,000  61,856,000
Other liabilities - derivatives5,471,000  (1,581,000)
Outstanding balances in impaired loans66,200,000  97,600,000
Nonfinancial Assets and Liabilities [Abstract]    
Foreclosed assets measured at fair value49,000,00051,200,000  
Allowance for possible loan losses, Charge-offs6,000,0005,000,000  
Foreclosed assets re-measured after initial recognition56,800,00048,100,000  
Write-downs Of Allowance For Foreclosed Assets After Initial Recognition10,800,00015,300,000  
Estimated fair value of financial instruments with immediate and shorter-term maturities maximum (in days)90 days or less   
Family residential properties, bedrooms (minimum)1   
Family residential properties (maximum)4   
Fair Value, Measurements, Recurring [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
    
Fair Values, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and short-term investments253,942,000  173,317,000
Securities available for sale2,476,905,000  2,177,249,000
Securities held to maturity71,046,000  140,847,000
Loans held for sale210,269,000  153,044,000
Net LHFI, excluding covered loans5,694,249,000  5,966,732,000
Covered loans79,064,000  0
FDIC indemnification asset33,436,000  0
Other assets - derivatives3,061,000  (2,247,000)
Deposits7,569,724,000  7,044,567,000
Short-term liabilities675,559,000  1,125,481,000
Long-term FHLB advances741,000  0
Subordinated notes49,831,000  49,806,000
Junior subordinated debt securities61,856,000  61,856,000
Other liabilities - derivatives5,471,000  (1,581,000)
Fair Value, Measurements, Recurring [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
    
Fair Values, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash and short-term investments253,942,000  173,317,000
Securities available for sale2,476,905,000  2,177,249,000
Securities held to maturity76,007,000  145,143,000
Loans held for sale210,269,000  153,044,000
Net LHFI, excluding covered loans5,755,286,000  6,030,219,000
Covered loans79,064,000  0
FDIC indemnification asset33,436,000  0
Other assets - derivatives3,061,000  (2,247,000)
Deposits7,578,697,000  7,054,611,000
Short-term liabilities675,559,000  1,125,481,000
Long-term FHLB advances741,000  0
Subordinated notes49,250,000  48,750,000
Junior subordinated debt securities34,021,000  30,928,000
Other liabilities - derivatives$ 5,471,000  $ (1,581,000)