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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) (USD $)
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Common dividends declared $ 0.40 $ 0.40 $ 0.30
Common stock options exercised 2,969 2,631 2,000
Purchase of treasury shares 81,510   13,500
Treasury stock shares acquired cost per share $ 10.88   $ 12.29
Stock issuance     5,290,000
Contribution of treasury stock to 401(K) plan 60,632 74,926 111,365
Preferred stock dividends declared, per share $ 37.15    
Investment Planning Consultants
      
Shares acquired     43,054
Preferred Stock
      
Stock issuance 18,921    
Common Stock
      
Stock issuance     5,290,000
Common Stock | TriStone Community Bank
      
Shares acquired     741,588
Additional Paid-in Capital
      
Common stock options exercised 2,969 2,631 2,000
Stock issuance     5,290,000
Contribution of treasury stock to 401(K) plan 60,632 74,926 111,365
Additional Paid-in Capital | GreenPoint Insurance Group
      
Shares acquired   22,814 22,008
Additional Paid-in Capital | TriStone Community Bank
      
Shares acquired     741,588
Retained Earnings
      
Common dividends declared $ 0.40 $ 0.40 $ 0.30
Preferred stock dividends declared, per share $ 37.15    
Treasury Stock
      
Common stock options exercised 2,969 2,631 2,000
Purchase of treasury shares 81,510   13,500
Treasury stock shares acquired cost per share $ 10.88   $ 12.29
Contribution of treasury stock to 401(K) plan 60,632 74,926 111,365
Treasury Stock | GreenPoint Insurance Group
      
Shares acquired   22,814 22,008