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Stockholders' Equity and Regulatory Capital (Narrative Disclosures) (Details)
 12 Months Ended
Jul. 15, 2008
right
Jun. 05, 2008
right
Dec. 31, 2015
$ / shares
$ / right
Dec. 31, 2014
$ / shares
Regulatory Capital Requirements [Abstract]        
Dividend declared of one common share purchase right for each outstanding share of common stock | right   1    
Dividend paid of one common share purchase right for each outstanding share of common stock | right 1      
Common stock, par value | $ / shares     $ 0.01 $ 0.01
Class of right, exercise price of rights | $ / shares     $ 42.50  
Class of right, exercise price for each one-half of a common share | $ / right     21.25  
Rights will be exercisable only if a person or group acquires fifteen percent or more of the corporation’s common stock or announces a tender offer for such stock     15.00%  
Value of additional shares acquired under the shareholder rights plan, common stock, market value multiplier of market value of common stock     2  
Description of possible effects of noncompliance or less than adequately capitalized     Failure to meet minimum capital requirements can result in certain mandatory, and possibly additional discretionary actions on the part of regulators, that if undertaken, could have a direct material effect on the Banks’ assets, liabilities and certain off-balance-sheet items as calculated under regulatory practices.