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Stockholders' Equity (Group's and the Bank's actual capital amounts and ratios) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Capital [Abstract]    
Minimum to be well capitalized - Total Capital $ 505,067 $ 511,893
Minimum to be well capitalized - Tier 1 capital 303,040 307,136
Minimum to be well capitalized - Tier 1 leverage 391,993 406,138
Risk Based Ratios [Abstract]    
Capital Required to be Well Capitalized to Risk Weighted Assets 10.00% 10.00%
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets 6.00% 6.00%
Tier One Leverage Capital Required to be Well Capitalized to Average Assets 5.00% 5.00%
Group [Member]
   
Capital [Abstract]    
Actual - Total capital 836,168 827,460
Actual - Tier 1 capital 745,619 736,930
Actual - Tier 1 leverage capital 745,619 736,930
Minimum Capital - Total Capital 404,054 409,514
Minimum capital - Tier 1 capital 202,027 204,757
Minimum capital - Tier 1 leverage capital 313,594 324,910
Risk Based Ratios [Abstract]    
Capital to Risk Weighted Assets 16.56% 16.16%
Tier One Risk Based Capital to Risk Weighted Assets 14.76% 14.35%
Tier One Leverage Capital to Average Assets 9.51% 9.11%
Capital Required for Capital Adequacy to Risk Weighted Assets 8.00% 8.00%
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets 4.00% 4.00%
Tier One Leverage Capital Required for Capital Adequacy to Average Assets 4.00% 4.00%
Bank [Member]
   
Capital [Abstract]    
Actual - Total capital 805,900 779,413
Actual - Tier 1 capital 715,591 688,350
Actual - Tier 1 leverage capital 715,591 688,350
Minimum Capital - Total Capital 402,495 407,637
Minimum capital - Tier 1 capital 201,248 203,819
Minimum capital - Tier 1 leverage capital 311,659 322,395
Minimum to be well capitalized - Total Capital 503,119 509,547
Minimum to be well capitalized - Tier 1 capital 301,871 305,728
Minimum to be well capitalized - Tier 1 leverage $ 389,574 $ 402,993
Risk Based Ratios [Abstract]    
Capital to Risk Weighted Assets 16.02% 15.30%
Tier One Risk Based Capital to Risk Weighted Assets 14.22% 13.51%
Tier One Leverage Capital to Average Assets 9.18% 8.54%
Capital Required for Capital Adequacy to Risk Weighted Assets 8.00% 8.00%
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets 4.00% 4.00%
Tier One Leverage Capital Required for Capital Adequacy to Average Assets 4.00% 4.00%
Capital Required to be Well Capitalized to Risk Weighted Assets 10.00% 10.00%
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets 6.00% 6.00%
Tier One Leverage Capital Required to be Well Capitalized to Average Assets 5.00% 5.00%