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Regulatory Capital (Tables) | 3 Months Ended
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Mar. 31, 2025
Summary of Significant Accounting Policies |
Summary of compliance with banking regulatory capital standards | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | March 31, 2025 |  | December 31, 2024 |
​ | ​ | ​ | ​ | ​ | Percent of | ​ | ​ | ​ | ​ | Percent of |
​ |  | Amount |  | Assets |  | Amount |  | Assets |
​ |  | (Dollars in thousands) | ​
Tier I (leverage) capital: |  | ​ |  |  |  |  | ​ |  |  |  | ​
Capital level | ​ | $ | 856,082 |  | 9.56 | % | $ | 847,588 |  | 9.31 | %
Requirement to be well-capitalized | ​ |  | 447,823 |  | 5.00 | ​ |  | 455,335 |  | 5.00 | ​
Excess | ​ |  | 408,259 |  | 4.56 | ​ |  | 392,253 |  | 4.31 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Common Equity Tier I risk-based capital: | ​ |  |  |  |  | ​ |  |  |  |  | ​
Capital level | ​ | $ | 856,082 |  | 12.74 | % | $ | 847,588 |  | 12.51 | %
Requirement to be well-capitalized | ​ |  | 436,787 |  | 6.50 | ​ |  | 440,259 |  | 6.50 | ​
Excess | ​ |  | 419,295 |  | 6.24 | ​ |  | 407,329 |  | 6.01 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Tier I risk-based capital: | ​ |  |  |  |  | ​ |  |  |  |  | ​
Capital level | ​ | $ | 856,082 |  | 12.74 | % | $ | 847,588 |  | 12.51 | %
Requirement to be well-capitalized | ​ |  | 537,584 |  | 8.00 | ​ |  | 541,857 |  | 8.00 | ​
Excess | ​ |  | 318,498 |  | 4.74 | ​ |  | 305,731 |  | 4.51 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total risk-based capital: | ​ |  |  |  |  | ​ |  |  |  |  | ​
Capital level | ​ | $ | 896,836 |  | 13.35 | % | $ | 887,902 |  | 13.11 | %
Requirement to be well-capitalized | ​ |  | 671,980 |  | 10.00 | ​ |  | 677,321 |  | 10.00 | ​
Excess | ​ |  | 224,856 |  | 3.35 | ​ |  | 210,581 |  | 3.11 | ​
Holding Company |
Summary of Significant Accounting Policies |
Summary of compliance with banking regulatory capital standards | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | March 31, 2025 |  | December 31, 2024 |
​ | ​ | ​ | ​ | ​ | Percent of | ​ | ​ | ​ | ​ | Percent of |
​ |  | Amount |  | Assets |  | Amount |  | Assets |
​ | ​ | (Dollars in thousands) |
Tier I (leverage) capital: |  | ​ |  |  |  |  | ​ |  |  |  | ​
Capital level | ​ | $ | 730,950 |  | 8.12 | % | $ | 731,958 |  | 8.04 | %
Requirement to be well-capitalized | ​ |  | 450,311 |  | 5.00 | ​ |  | 455,297 |  | 5.00 | ​
Excess | ​ |  | 280,639 |  | 3.12 | ​ |  | 276,661 |  | 3.04 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Common Equity Tier I risk-based capital: | ​ |  | ​ |  |  | ​ |  | ​ |  |  | ​
Capital level | ​ | $ | 683,670 |  | 10.17 | % | $ | 685,004 |  | 10.13 | %
Requirement to be well-capitalized | ​ |  | 436,754 |  | 6.50 | ​ |  | 439,533 |  | 6.50 | ​
Excess | ​ |  | 246,916 |  | 3.67 | ​ |  | 245,471 |  | 3.63 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Tier I risk-based capital: | ​ |  | ​ |  |  | ​ |  | ​ |  |  | ​
Capital level | ​ | $ | 730,950 |  | 10.88 | % | $ | 731,958 |  | 10.82 | %
Requirement to be well-capitalized | ​ |  | 537,543 |  | 8.00 | ​ |  | 540,964 |  | 8.00 | ​
Excess | ​ |  | 193,407 |  | 2.88 | ​ |  | 190,994 |  | 2.82 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total risk-based capital: | ​ |  | ​ |  |  | ​ |  | ​ |  |  | ​
Capital level | ​ | $ | 961,704 |  | 14.31 | % | $ | 962,272 |  | 14.23 | %
Requirement to be well-capitalized | ​ |  | 671,929 |  | 10.00 | ​ |  | 676,205 |  | 10.00 | ​
Excess | ​ |  | 289,775 |  | 4.31 | ​ |  | 286,067 |  | 4.23 | ​
​

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