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Regulatory Capital (Tables) | 12 Months Ended
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Dec. 31, 2022
Regulatory Capital Requirements under Banking Regulations [Abstract] |
Summary of Regulatory Capital Requirement | Horizon and the Bank’s actual and required capital ratios as of December 31, 2022 and 2021 were as follows:
| Actual |  | Required for Capital Adequacy Purposes(1) |  | Required For Capital Adequacy Purposes with Capital Buffer(1) |  | Well Capitalized Under Prompt Corrective Action Provisions(1)
| Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio
December 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total capital (to risk–weighted assets)(1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated | $ | 776,390 |  |  | 14.37 | % |  | $ | 432,172 |  |  | 8.00 | % |  | $ | 567,226 |  |  | 10.50 | % |  | N/A |  | N/A
Bank | 726,339 |  |  | 13.59 | % |  | 427,456 |  |  | 8.00 | % |  | 561,036 |  |  | 10.50 | % |  | $ | 534,320 |  |  | 10.00 | %
Tier 1 capital (to risk–weighted assets)(1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated | 729,835 |  |  | 13.51 | % |  | 324,129 |  |  | 6.00 | % |  | 459,183 |  |  | 8.50 | % |  | N/A |  | N/A
Bank | 679,784 |  |  | 12.72 | % |  | 320,592 |  |  | 6.00 | % |  | 454,172 |  |  | 8.50 | % |  | 427,456 |  |  | 8.00 | %
Common equity tier 1 capital (to risk–weighted assets)(1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated | 609,630 |  |  | 11.28 | % |  | 243,097 |  |  | 4.50 | % |  | 378,151 |  |  | 7.00 | % |  | N/A |  | N/A
Bank | 679,784 |  |  | 12.72 | % |  | 240,444 |  |  | 4.50 | % |  | 374,024 |  |  | 7.00 | % |  | 347,308 |  |  | 6.50 | %
Tier 1 capital (to average assets)(1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated | 729,835 |  |  | 10.03 | % |  | 291,122 |  |  | 4.00 | % |  | 291,122 |  |  | 4.00 | % |  | N/A |  | N/A
Bank | 679,784 |  |  | 8.89 | % |  | 305,996 |  |  | 4.00 | % |  | 305,996 |  |  | 4.00 | % |  | 382,495 |  |  | 5.00 | %
December 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total capital (to risk–weighted assets)(1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated | $ | 708,198 |  |  | 15.71 | % |  | $ | 360,737 |  |  | 8.00 | % |  | $ | 473,468 |  |  | 10.500 | % |  | N/A |  | N/A
Bank | 664,061 |  |  | 14.72 | % |  | 361,015 |  |  | 8.00 | % |  | 473,832 |  |  | 10.500 | % |  | $ | 451,269 |  |  | 10.00 | %
Tier 1 capital (to risk–weighted assets)(1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated | 661,729 |  |  | 14.68 | % |  | 270,553 |  |  | 6.00 | % |  | 383,284 |  |  | 8.500 | % |  | N/A |  | N/A
Bank | 617,592 |  |  | 13.69 | % |  | 270,761 |  |  | 6.00 | % |  | 383,578 |  |  | 8.500 | % |  | 361,015 |  |  | 8.00 | %
Common equity tier 1 capital (to risk–weighted assets)(1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated | 541,920 |  |  | 12.02 | % |  | 202,915 |  |  | 4.50 | % |  | 315,645 |  |  | 7.500 | % |  | N/A |  | N/A
Bank | 617,592 |  |  | 13.69 | % |  | 203,071 |  |  | 4.50 | % |  | 315,888 |  |  | 7.500 | % |  | 293,325 |  |  | 6.50 | %
Tier 1 capital (to average assets)(1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated | 661,729 |  |  | 9.05 | % |  | 292,335 |  |  | 4.00 | % |  | 292,335 |  |  | 4.000 | % |  | N/A |  | N/A
Bank | 617,592 |  |  | 8.50 | % |  | 29,064 |  |  | 4.00 | % |  | 290,646 |  |  | 4.000 | % |  | 363,307 |  |  | 5.00 | %
(1)As defined by regulatory agencies

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- Definition Regulatory Capital Requirements under Banking Regulations + References No definition available. + Details
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- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI https://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826 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 https://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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