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Regulatory Matters (Tables) | 12 Months Ended
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Dec. 31, 2024
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract] |
Regulatory Capital Amounts and Ratios for Company and Bank | The following table summarizes regulatory capital amounts and ratios for the Company and the Bank as of December 31, 2024 and 2023.
|  | Actual |  |  | Minimum Required Plus Capital Conservation Buffer |  |  | To Be Well Capitalized under Prompt Corrective Action Provisions |
|  | Amount |  |  | Ratio |  |  | Amount |  |  |  |  | Ratio |  |  | Amount |  |  |  |  | Ratio |
|  | (Dollars in thousands) |
As of December 31, 2024: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tier 1 Capital (to Average- Assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 1,727,872 |  |  |  | 11.46 | % |  | $ | 603,247 |  |  | > |  |  | 4.00 | % |  |  |  |  |  |  | N/A |
Bank |  | $ | 1,704,433 |  |  |  | 11.30 | % |  | $ | 603,506 |  |  | > |  |  | 4.00 | % |  | $ | 754,382 |  |  | > |  |  | 5.00 | %
Common equity Tier 1 capital ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 1,727,872 |  |  |  | 16.24 | % |  | $ | 744,579 |  |  | > |  |  | 7.00 | % |  |  |  |  |  |  | N/A |
Bank |  | $ | 1,704,433 |  |  |  | 16.01 | % |  | $ | 745,068 |  |  | > |  |  | 7.00 | % |  | $ | 691,849 |  |  | > |  |  | 6.50 | %
Tier 1 Capital (to Risk-Weighted Assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 1,727,872 |  |  |  | 16.24 | % |  | $ | 904,131 |  |  | > |  |  | 8.50 | % |  |  |  |  |  |  | N/A |
Bank |  | $ | 1,704,433 |  |  |  | 16.01 | % |  | $ | 904,726 |  |  | > |  |  | 8.50 | % |  | $ | 851,507 |  |  | > |  |  | 8.00 | %
Total Capital (to Risk-Weighted Assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 1,814,244 |  |  |  | 17.06 | % |  | $ | 1,116,868 |  |  | > |  |  | 10.50 | % |  |  |  |  |  |  | N/A |
Bank |  | $ | 1,790,805 |  |  |  | 16.82 | % |  | $ | 1,117,602 |  |  | > |  |  | 10.50 | % |  | $ | 1,064,383 |  |  | > |  |  | 10.00 | %
As of December 31, 2023: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Tier 1 Capital (to Average- Assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 1,626,626 |  |  |  | 10.27 | % |  | $ | 633,372 |  |  | > |  |  | 4.00 | % |  |  |  |  |  |  | N/A |
Bank |  | $ | 1,610,514 |  |  |  | 10.17 | % |  | $ | 633,582 |  |  | > |  |  | 4.00 | % |  | $ | 791,978 |  |  | > |  |  | 5.00 | %
Common equity Tier 1 capital ratio |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 1,626,626 |  |  |  | 14.65 | % |  | $ | 777,359 |  |  | > |  |  | 7.00 | % |  |  |  |  |  |  | N/A |
Bank |  | $ | 1,610,514 |  |  |  | 14.49 | % |  | $ | 777,782 |  |  | > |  |  | 7.00 | % |  | $ | 722,226 |  |  | > |  |  | 6.50 | %
Tier 1 Capital (to Risk-Weighted Assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 1,626,626 |  |  |  | 14.65 | % |  | $ | 943,936 |  |  | > |  |  | 8.50 | % |  |  |  |  |  |  | N/A |
Bank |  | $ | 1,610,514 |  |  |  | 14.49 | % |  | $ | 944,450 |  |  | > |  |  | 8.50 | % |  | $ | 888,894 |  |  | > |  |  | 8.00 | %
Total Capital (to Risk-Weighted Assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company |  | $ | 1,720,968 |  |  |  | 15.50 | % |  | $ | 1,166,038 |  |  | > |  |  | 10.50 | % |  |  |  |  |  |  | N/A |
Bank |  | $ | 1,704,856 |  |  |  | 15.34 | % |  | $ | 1,166,673 |  |  | > |  |  | 10.50 | % |  | $ | 1,111,118 |  |  | > |  |  | 10.00 | %

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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 -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1B + Details
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