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Stockholders' Equity (Group's and the Bank's actual capital amounts and ratios) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Capital [Abstract]
Minimum to be well capitalized - Total Capital	$ 499,438	$ 511,893
Minimum to be well capitalized - Tier 1 capital	299,663	307,136
Minimum to be well capitalized - Tier 1 leverage	377,286	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	863,790	827,460
Actual - Tier 1 capital	773,824	736,930
Actual - Tier 1 leverage capital	773,824	736,930
Minimum Capital - Total Capital	399,550	409,514
Minimum capital - Tier 1 capital	199,775	204,757
Minimum capital - Tier 1 leverage capital	301,829	324,910
Risk Based Ratios [Abstract]
Capital to Risk Weighted Assets	17.30%	16.16%
Tier One Risk Based Capital to Risk Weighted Assets	15.49%	14.35%
Tier One Leverage Capital to Average Assets	10.26%	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	812,267	779,413
Actual - Tier 1 capital	722,603	688,350
Actual - Tier 1 leverage capital	722,603	688,350
Minimum Capital - Total Capital	397,593	407,637
Minimum capital - Tier 1 capital	198,796	203,819
Minimum capital - Tier 1 leverage capital	299,657	322,395
Minimum to be well capitalized - Total Capital	496,991	509,547
Minimum to be well capitalized - Tier 1 capital	298,195	305,728
Minimum to be well capitalized - Tier 1 leverage	$ 374,571	$ 402,993
Risk Based Ratios [Abstract]
Capital to Risk Weighted Assets	16.34%	15.30%
Tier One Risk Based Capital to Risk Weighted Assets	14.54%	13.51%
Tier One Leverage Capital to Average Assets	9.65%	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%

X

- Definition

The amount of total capital as defined in the regulations.

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Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital.

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