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Regulatory Capital (Tables) | 9 Months Ended
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Sep. 30, 2025
Summary of Significant Accounting Policies |
Summary of compliance with banking regulatory capital standards | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30, 2025 |  | December 31, 2024 |
​ | ​ | ​ | ​ | ​ | Percent of | ​ | ​ | ​ | ​ | Percent of |
​ |  | Amount |  | Assets |  | Amount |  | Assets |
​ |  | (Dollars in thousands) | ​
Tier I (leverage) capital: |  | ​ |  |  |  |  | ​ |  |  |  | ​
Capital level | ​ | $ | 895,465 |  | 10.30 | % | $ | 847,588 |  | 9.31 | %
Requirement to be well-capitalized | ​ |  | 434,841 |  | 5.00 | ​ |  | 455,335 |  | 5.00 | ​
Excess | ​ |  | 460,624 |  | 5.30 | ​ |  | 392,253 |  | 4.31 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Common Equity Tier I risk-based capital: | ​ |  |  |  |  | ​ |  |  |  |  | ​
Capital level | ​ | $ | 895,465 |  | 13.38 | % | $ | 847,588 |  | 12.51 | %
Requirement to be well-capitalized | ​ |  | 435,047 |  | 6.50 | ​ |  | 440,259 |  | 6.50 | ​
Excess | ​ |  | 460,418 |  | 6.88 | ​ |  | 407,329 |  | 6.01 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Tier I risk-based capital: | ​ |  |  |  |  | ​ |  |  |  |  | ​
Capital level | ​ | $ | 895,465 |  | 13.38 | % | $ | 847,588 |  | 12.51 | %
Requirement to be well-capitalized | ​ |  | 535,442 |  | 8.00 | ​ |  | 541,857 |  | 8.00 | ​
Excess | ​ |  | 360,023 |  | 5.38 | ​ |  | 305,731 |  | 4.51 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total risk-based capital: | ​ |  |  |  |  | ​ |  |  |  |  | ​
Capital level | ​ | $ | 938,033 |  | 14.02 | % | $ | 887,902 |  | 13.11 | %
Requirement to be well-capitalized | ​ |  | 669,303 |  | 10.00 | ​ |  | 677,321 |  | 10.00 | ​
Excess | ​ |  | 268,730 |  | 4.02 | ​ |  | 210,581 |  | 3.11 | ​
Holding Company |
Summary of Significant Accounting Policies |
Summary of compliance with banking regulatory capital standards | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30, 2025 |  | December 31, 2024 |
​ | ​ | ​ | ​ | ​ | Percent of | ​ | ​ | ​ | ​ | Percent of |
​ |  | Amount |  | Assets |  | Amount |  | Assets |
​ | ​ | (Dollars in thousands) |
Tier I (leverage) capital: |  | ​ |  |  |  |  | ​ |  |  |  | ​
Capital level | ​ | $ | 751,258 |  | 8.64 | % | $ | 731,958 |  | 8.04 | %
Requirement to be well-capitalized | ​ |  | 434,790 |  | 5.00 | ​ |  | 455,297 |  | 5.00 | ​
Excess | ​ |  | 316,468 |  | 3.64 | ​ |  | 276,661 |  | 3.04 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Common Equity Tier I risk-based capital: | ​ |  | ​ |  |  | ​ |  | ​ |  |  | ​
Capital level | ​ | $ | 703,450 |  | 10.51 | % | $ | 685,004 |  | 10.13 | %
Requirement to be well-capitalized | ​ |  | 434,982 |  | 6.50 | ​ |  | 439,533 |  | 6.50 | ​
Excess | ​ |  | 268,468 |  | 4.01 | ​ |  | 245,471 |  | 3.63 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Tier I risk-based capital: | ​ |  | ​ |  |  | ​ |  | ​ |  |  | ​
Capital level | ​ | $ | 751,258 |  | 11.23 | % | $ | 731,958 |  | 10.82 | %
Requirement to be well-capitalized | ​ |  | 535,363 |  | 8.00 | ​ |  | 540,964 |  | 8.00 | ​
Excess | ​ |  | 215,895 |  | 3.23 | ​ |  | 190,994 |  | 2.82 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total risk-based capital: | ​ |  | ​ |  |  | ​ |  | ​ |  |  | ​
Capital level | ​ | $ | 983,826 |  | 14.70 | % | $ | 962,272 |  | 14.23 | %
Requirement to be well-capitalized | ​ |  | 669,204 |  | 10.00 | ​ |  | 676,205 |  | 10.00 | ​
Excess | ​ |  | 314,622 |  | 4.70 | ​ |  | 286,067 |  | 4.23 | ​
​

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