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Regulatory Capital - Well Capitalized Regulatory Requirements (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Actual Amount |  |
Common Equity Tier I Capital (to Risk-Weighted Assets) | $ 2,494,964 | $ 2,350,081
Tier 1 Capital (to Risk-Weighted Assets) | 2,494,964 | 2,350,081
Total Capital (to Risk-Weighted Assets) | 2,761,446 | 2,597,926
Tier 1 Capital (to Average Assets) | $ 2,494,964 | $ 2,350,081
Actual Ratio |  |
Common Equity Tier I Capital (to Risk-Weighted Assets) | 11.70% | 11.90%
Tier 1 Capital (to Risk-Weighted Assets) | 11.70% | 11.90%
Total Capital (to Risk-Weighted Assets) | 13.00% | 13.10%
Tier 1 Capital (to Average Assets) | 11.00% | 11.00%
Well Capitalized Regulatory Requirements, Amount |  |
Common Equity Tier I Capital (to Risk-Weighted Assets) | $ 1,385,322 | $ 1,288,435
Tier 1 Capital (to Risk-Weighted Assets) | 1,705,011 | 1,585,767
Total Capital (to Risk-Weighted Assets) | 2,131,264 | 1,982,208
Tier 1 Capital (to Average Assets) | $ 1,138,524 | $ 1,067,739
Well Capitalized Regulatory Requirements, Ratio |  |
Common Equity Tier I Capital (to Risk-Weighted Assets) | 6.50% | 6.50%
Tier 1 Capital (to Risk-Weighted Assets) | 8.00% | 8.00%
Total Capital (to Risk-Weighted Assets) | 10.00% | 10.00%
Tier 1 Capital (to Average Assets) | 5.00% | 5.00%

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- Definition The amount of total capital as defined in the regulations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47304-110998 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 Reference 3: 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=84167132&loc=d3e65071-112826 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 948 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=6490092&loc=d3e47080-110998 + 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=84167132&loc=SL5958568-112826 + Details
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- Definition The amount of Tier 1 Leverage 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=84167132&loc=SL5958568-112826 + Details
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