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Regulatory Capital - Well Capitalized Regulatory Requirements (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Actual Amount |  |
Tier 1 Capital (to Average Assets) | $ 3,264,309 | $ 2,896,091
Tier 1 Capital (to Risk-Weighted Assets) | 3,264,309 | 2,896,091
Total Capital (to Risk-Weighted Assets) | 3,600,668 | 3,196,279
Tier 1 Capital (to Average Assets) | $ 3,264,309 | $ 2,896,091
Actual Ratio |  |
Tier 1 Capital (to Average Assets) | 12.20% | 12.10%
Tier 1 Capital (to Risk-Weighted Assets) | 12.20% | 12.10%
Total Capital (to Risk-Weighted Assets) | 13.40% | 13.30%
Tier 1 Capital (to Average Assets) | 10.20% | 11.10%
Well Capitalized Regulatory Requirements, Amount |  |
Tier 1 Capital (to Average Assets) | $ 1,876,050 | $ 1,528,209
Tier 1 Capital (to Risk-Weighted Assets) | 2,278,060 | 1,887,787
Total Capital (to Risk-Weighted Assets) | 2,814,074 | 2,367,226
Tier 1 Capital (to Average Assets) | $ 1,282,642 | $ 1,039,226
Well Capitalized Regulatory Requirements, Ratio |  |
Tier 1 Capital (to Average Assets) | 7.00% | 6.375%
Tier 1 Capital (to Risk-Weighted Assets) | 8.50% | 7.875%
Total Capital (to Risk-Weighted Assets) | 10.50% | 9.875%
Tier 1 Capital (to Average Assets) | 4.00% | 4.00%

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- Definition The amount of total capital as defined in the regulations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=d3e65071-112826 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -Subparagraph (c)(2) -URI http://asc.fasb.org/extlink&oid=117337116&loc=d3e65071-112826 + Details
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