Regulatory Capital Requirements (Group's and the Bank's actual capital amounts and ratios) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Group [Member]
Capital [Abstract]
Actual - Total capital	$ 846,748	$ 851,437
Actual - Tier 1 capital	782,912	776,525
Actual -Common equity tier 1 capital	594,482
Actual - Tier 1 leverage capital	782,912	776,525
Minimum Capital - Total Capital	391,723	387,772
Minimum capital - Tier 1 capital	293,792	193,886
Minimum capital - Common equity tier 1 capital	220,344
Minimum capital - Tier 1 leverage capital	280,009	292,738
Minimum to be well capitalized - Total Capital	489,654	484,715
Minimum to be well capitalized - Tier 1 capital	391,723	290,829
Minimum to be well capitalized - Common equity tier 1 capital	318,275
Minimum to be well capitalized - Tier 1 leverage	$ 350,011	$ 365,922
Risk Based Ratios [Abstract]
Capital to Risk Weighted Assets	17.29%	17.57%
Tier One Risk Based Capital to Risk Weighted Assets	15.99%	16.02%
Common Equity Tier OneTo Risk Weighted Assets	12.14%
Tier One Leverage Capital to Average Assets	11.18%	10.61%
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	6.00%	4.00%
Common Equity Tier One Required For Capital Adequacy To Risk Weighted Assets	4.50%
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	8.00%	6.00%
Tier One Risk Common Equity Tier One Required To Be Well Capitalized To Risk Weighted Assets	6.50%
Tier One Leverage Capital Required to be Well Capitalized to Average Assets	5.00%	5.00%
Bank [Member]
Capital [Abstract]
Actual - Total capital	$ 815,458	$ 820,884
Actual - Tier 1 capital	751,886	746,177
Actual -Common equity tier 1 capital	751,886
Actual - Tier 1 leverage capital	751,886	746,177
Minimum Capital - Total Capital	390,688	386,444
Minimum capital - Tier 1 capital	293,016	193,222
Minimum capital - Common equity tier 1 capital	219,762
Minimum capital - Tier 1 leverage capital	278,399	290,879
Minimum to be well capitalized - Total Capital	488,360	483,055
Minimum to be well capitalized - Tier 1 capital	390,688	289,833
Minimum to be well capitalized - Common equity tier 1 capital	317,434
Minimum to be well capitalized - Tier 1 leverage	$ 347,999	$ 363,599
Risk Based Ratios [Abstract]
Capital to Risk Weighted Assets	16.70%	16.99%
Tier One Risk Based Capital to Risk Weighted Assets	15.40%	15.45%
Common Equity Tier OneTo Risk Weighted Assets	15.40%
Tier One Leverage Capital to Average Assets	10.80%	10.26%
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	6.00%	4.00%
Common Equity Tier One Required For Capital Adequacy To Risk Weighted Assets	4.50%
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	8.00%	6.00%
Tier One Risk Common Equity Tier One Required To Be Well Capitalized To Risk Weighted Assets	6.50%
Tier One Leverage Capital Required to be Well Capitalized to Average Assets	5.00%	5.00%

The common equity tier 1 capital ratio as defined in the new regulatory framework.

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The amount of Comon Equity Tier 1 required to be categorized as well capitalized under the new regulatory framework.

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The minimum Common Equity Tier One Capital Ratio (Common Equity Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the new regulatory framework.

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Common Equity Tier 1 to Risk Weighted Assets (Common Equity Tier 1 divided by risk weighted assets) as defined by regulations.

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The minimum Common Equity Tier One Capital Ratio (Common Equity Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the new regulatory framework.

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The minimum amount of Common Equity Tier 1 required for capital adequacy purposes under the new regulatory framework.

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The amount of total capital as defined in the regulations.

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The minimum amount of Total Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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The minimum Total risk based capital ratio (total capital divided by risk weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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The amount of Total Capital required to be categorized as well as capitalized under the regulatory framework for prompt corrective action.

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The Total risk based capital ratio (total capital divided by risk weighted assets) required to be categorized as "well capitalized", in the regulatory framework for prompt corrective action.

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Total Capital divided by risk weighted assets 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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The minimum amount of Tier 1 Leverage Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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The minimum amount of Tier 1 Leverage Capital for capital adequacy purposes divided by average assets as defined in the regulations.

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The amount of Tier 1 Leverage Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action.

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The amount of Tier 1 Leverage Capital required to be categorized as well capitalized divided by average assets as defined in the regulatory framework for prompt corrective action.

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Tier 1 Leverage Capital divided by average assets as defined in the regulations.

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Tier 1 Risk Based Capital as defined in the regulations.

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The minimum amount of Tier 1 Risk Based Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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The minimum Tier One Capital Ratio (Tier one capital divided by risk-weighted assets) required for capital adequacy purposes under the regulatory framework for prompt corrective action.

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The amount of Tier 1 Risk Based Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action.

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The Tier 1 capital ratio (Tier 1 capital divided by risk weighted assets) required to be categorized as "well capitalized" under the regulatory framework for prompt corrective action.

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Tier 1 capital divided by risk weighted assets as defined by regulations.

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