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Regulatory Capital - Well Capitalized Regulatory Requirements (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Actual Amount |  |
Tier 1 Capital (to Average Assets) | $ 3,579,005 | $ 3,264,309
Tier 1 Capital (to Risk-Weighted Assets) | 3,579,005 | 3,264,309
Total Capital (to Risk-Weighted Assets) | 3,849,820 | 3,600,668
Tier 1 Capital (to Average Assets) | $ 3,579,005 | $ 3,264,309
Actual Ratio |  |
Tier 1 Capital (to Average Assets) | 14.00% | 12.20%
Tier 1 Capital (to Risk-Weighted Assets) | 0.140 | 0.122
Total Capital (to Risk-Weighted Assets) | 0.150 | 0.134
Tier 1 Capital (to Average Assets) | 0.113 | 0.102
Well Capitalized Regulatory Requirements, Amount |  |
Tier 1 Capital (to Average Assets) | $ 1,794,780 | $ 1,876,050
Tier 1 Capital (to Risk-Weighted Assets) | 2,179,375 | 2,278,060
Total Capital (to Risk-Weighted Assets) | 2,692,169 | 2,814,074
Tier 1 Capital (to Average Assets) | $ 1,264,424 | $ 1,282,642
Well Capitalized Regulatory Requirements, Ratio |  |
Tier 1 Capital (to Average Assets) | 7.00% | 7.00%
Tier 1 Capital (to Risk-Weighted Assets) | 0.085 | 0.085
Total Capital (to Risk-Weighted Assets) | 0.105 | 0.105
Tier 1 Capital (to Average Assets) | 0.040 | 0.040

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- Definition Amount of total capital as defined by regulatory framework. + 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 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 + Details
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