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Stockholders' Equity (Group's and the Bank's actual capital amounts and ratios) (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Capital [Abstract]    
Minimum to be well capitalized - Total Capital   $ 511,893
Minimum to be well capitalized - Tier 1 capital   307,136
Minimum to be well capitalized - Tier 1 leverage   406,138
Risk Based Ratios [Abstract]    
Capital Required to be Well Capitalized to Risk Weighted Assets   10.00%
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets   6.00%
Tier One Leverage Capital Required to be Well Capitalized to Average Assets   5.00%
Group [Member]
    
Capital [Abstract]    
Actual - Total capital 858,356 827,459
Actual - Tier 1 capital 782,797 736,106
Actual - Tier 1 leverage capital 782,797 736,106
Minimum Capital - Total Capital 392,465 409,514
Minimum capital - Tier 1 capital 196,233 204,757
Minimum capital - Tier 1 leverage capital 297,984 324,910
Minimum to be well capitalized - Total Capital 490,581  
Minimum to be well capitalized - Tier 1 capital 294,349  
Minimum to be well capitalized - Tier 1 leverage 372,480  
Risk Based Ratios [Abstract]    
Capital to Risk Weighted Assets 17.50% 16.16%
Tier One Risk Based Capital to Risk Weighted Assets 15.96% 14.38%
Tier One Leverage Capital to Average Assets 10.51% 9.06%
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%  
Tier One Risk Based Capital Required to be Well Capitalized to Risk Weighted Assets 6.00%  
Tier One Leverage Capital Required to be Well Capitalized to Average Assets 5.00%  
Bank [Member]
    
Capital [Abstract]    
Actual - Total capital 813,760 779,413
Actual - Tier 1 capital 738,482 688,350
Actual - Tier 1 leverage capital 738,482 688,350
Minimum Capital - Total Capital 390,644 407,637
Minimum capital - Tier 1 capital 195,322 203,819
Minimum capital - Tier 1 leverage capital 295,673 322,395
Minimum to be well capitalized - Total Capital 488,305 509,547
Minimum to be well capitalized - Tier 1 capital 292,983 305,728
Minimum to be well capitalized - Tier 1 leverage $ 369,592 $ 402,993
Risk Based Ratios [Abstract]    
Capital to Risk Weighted Assets 16.66% 15.30%
Tier One Risk Based Capital to Risk Weighted Assets 15.12% 13.51%
Tier One Leverage Capital to Average Assets 9.99% 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%