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Long-Term Debt (Narrative) (Details) (USD $)
0 Months Ended3 Months Ended6 Months Ended9 Months Ended
Oct. 24, 2011
Sep. 30, 2011
Sep. 30, 2011
Sep. 30, 2011
Jun. 30, 2011
Long-Term Debt [Abstract]     
Subordinated notes par value $ 150,000,000$ 150,000,000$ 150,000,000 
Subordinated notes interest rate   5.875% 
Subordinated notes maturity dateJun. 03, 2013Apr. 01, 2017
Percentage of potential amount of reduction from capital 20.00%   
Term loan note payable 140,000,000140,000,000140,000,000140,000,000
Reference rate for loan variable rate   LIBOR 
Percentage points added to reference rate 2.00%2.00%2.00% 
Maximum ratio of consolidated non-performing assets to consolidated total loans and OREO excluding covered loans through June 2012   4.00% 
Maximum ratio of consolidated non performing assets to consolidated total loans and OREO excluding covered loans thereafter   3.50% 
Consolidated net worth 2,100,000,0002,100,000,0002,100,000,000 
Percentage of consolidated net worth increase by consolidated net income   50.00% 
Percentage of consolidated net worth increase by issuance of common stock   100.00% 
Minimum Tier 1 leverage ratio 7.00%7.00%7.00% 
Minimum Tier 1 risk based capital ratio 9.50%9.50%9.50% 
Tier 1 leverage ration, basis points 7.00%7.00%7.00% 
Minimum total risk based capital ratio 11.50%11.50%11.50% 
Tier 1 leverage ratio 6.93%6.93%6.93% 
Weighted-average yield   4.00% 
Borrowings maturity date, starting period   2015 
Borrowings maturity date, ending period   2018 
Payable to unconsolidated trusts   16,800,000 
Redemption of debentures$ 10,300,000$ 6,500,000