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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
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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%

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- Definition The minimum amount of Total Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7881181&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958568-112826 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7881181&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958568-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958570-112826 + Details
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- Definition The amount of Total Capital required to be categorized as well as capitalized under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958568-112826 + Details
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- Definition Tier 1 Leverage Capital as defined in the regulations. Also called Core Capital. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7881181&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958568-112826 + Details
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- Definition The minimum amount of Tier 1 Leverage Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7881181&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958568-112826 + Details
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- Definition The minimum amount of Tier 1 Risk Based Capital required for capital adequacy purposes under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7881181&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958568-112826 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=7881181&loc=d3e65071-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958568-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958570-112826 + Details
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- Definition The amount of Tier 1 Risk Based Capital required to be categorized as well capitalized under the regulatory framework for prompt corrective action. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958568-112826 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=7881181&loc=SL5958568-112826 + Details
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