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Regulatory Capital - Well Capitalized Regulatory Requirements (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
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Actual Amount |  |
Tier 1 Capital (to Average Assets) | $ 3,314,657 | $ 3,579,005
Tier 1 Capital (to Risk-Weighted Assets) | 3,314,657 | 3,579,005
Total Capital (to Risk-Weighted Assets) | 3,410,183 | 3,849,820
Tier 1 Capital (to Average Assets) | $ 3,314,657 | $ 3,579,005
Actual Ratio |  |
Tier 1 Capital (to Average Assets) | 14.10% | 14.00%
Tier 1 Capital (to Risk-Weighted Assets) | 0.141 | 0.140
Total Capital (to Risk-Weighted Assets) | 0.145 | 0.150
Tier 1 Capital (to Average Assets) | 0.111 | 0.113
Well Capitalized Regulatory Requirements, Amount |  |
Tier 1 Capital (to Average Assets) | $ 1,643,132 | $ 1,794,780
Tier 1 Capital (to Risk-Weighted Assets) | 1,995,232 | 2,179,375
Total Capital (to Risk-Weighted Assets) | 2,464,699 | 2,692,169
Tier 1 Capital (to Average Assets) | $ 1,198,808 | $ 1,264,424
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://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 + Details
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