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Regulatory Capital (Tables) | 12 Months Ended
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Dec. 31, 2024
Summary of Significant Accounting Policies |
Summary of compliance with banking regulatory capital standards | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2024 |  | December 31, 2023 |
​ | ​ | ​ | ​ | ​ | Percent of | ​ | ​ | ​ | ​ | Percent of |
​ |  | Amount |  | Assets |  | Amount |  | Assets |
​ |  | (Dollars in thousands) | ​
Tier I (leverage) capital: |  | ​ |  |  |  |  | ​ |  |  |  | ​
Capital level | ​ | $ | 847,588 |  | 9.31 | % | $ | 825,104 |  | 9.47 | %
Requirement to be well-capitalized | ​ |  | 455,335 |  | 5.00 | ​ |  | 435,792 |  | 5.00 | ​
Excess | ​ |  | 392,253 |  | 4.31 | ​ |  | 389,312 |  | 4.47 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Common Equity Tier I risk-based capital: | ​ |  |  |  |  | ​ |  |  |  |  | ​
Capital level | ​ | $ | 847,588 |  | 12.51 | % | $ | 825,104 |  | 12.22 | %
Requirement to be well-capitalized | ​ |  | 440,259 |  | 6.50 | ​ |  | 438,878 |  | 6.50 | ​
Excess | ​ |  | 407,329 |  | 6.01 | ​ |  | 386,226 |  | 5.72 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Tier I risk-based capital: | ​ |  |  |  |  | ​ |  |  |  |  | ​
Capital level | ​ | $ | 847,588 |  | 12.51 | % | $ | 825,104 |  | 12.22 | %
Requirement to be well-capitalized | ​ |  | 541,857 |  | 8.00 | ​ |  | 540,157 |  | 8.00 | ​
Excess | ​ |  | 305,731 |  | 4.51 | ​ |  | 284,947 |  | 4.22 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total risk-based capital: | ​ |  |  |  |  | ​ |  |  |  |  | ​
Capital level | ​ | $ | 887,902 |  | 13.11 | % | $ | 864,999 |  | 12.81 | %
Requirement to be well-capitalized | ​ |  | 677,321 |  | 10.00 | ​ |  | 675,196 |  | 10.00 | ​
Excess | ​ |  | 210,581 |  | 3.11 | ​ |  | 189,803 |  | 2.81 | ​
Holding Company |
Summary of Significant Accounting Policies |
Summary of compliance with banking regulatory capital standards | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2024 |  | December 31, 2023 |
​ | ​ | ​ | ​ | ​ | Percent of | ​ | ​ | ​ | ​ | Percent of |
​ |  | Amount |  | Assets |  | Amount |  | Assets |
​ | ​ | (Dollars in thousands) |
Tier I (leverage) capital: |  | ​ |  |  |  |  | ​ |  |  |  | ​
Capital level | ​ | $ | 731,958 |  | 8.04 | % | $ | 737,732 |  | 8.47 | %
Requirement to be well-capitalized | ​ |  | 455,297 |  | 5.00 | ​ |  | 435,748 |  | 5.00 | ​
Excess | ​ |  | 276,661 |  | 3.04 | ​ |  | 301,984 |  | 3.47 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Common Equity Tier I risk-based capital: | ​ |  | ​ |  |  | ​ |  | ​ |  |  | ​
Capital level | ​ | $ | 685,004 |  | 10.13 | % | $ | 691,754 |  | 10.25 | %
Requirement to be well-capitalized | ​ |  | 439,533 |  | 6.50 | ​ |  | 438,770 |  | 6.50 | ​
Excess | ​ |  | 245,471 |  | 3.63 | ​ |  | 252,984 |  | 3.75 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Tier I risk-based capital: | ​ |  | ​ |  |  | ​ |  | ​ |  |  | ​
Capital level | ​ | $ | 731,958 |  | 10.82 | % | $ | 737,732 |  | 10.93 | %
Requirement to be well-capitalized | ​ |  | 540,964 |  | 8.00 | ​ |  | 540,024 |  | 8.00 | ​
Excess | ​ |  | 190,994 |  | 2.82 | ​ |  | 197,708 |  | 2.93 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total risk-based capital: | ​ |  | ​ |  |  | ​ |  | ​ |  |  | ​
Capital level | ​ | $ | 962,272 |  | 14.23 | % | $ | 967,627 |  | 14.33 | %
Requirement to be well-capitalized | ​ |  | 676,205 |  | 10.00 | ​ |  | 675,030 |  | 10.00 | ​
Excess | ​ |  | 286,067 |  | 4.23 | ​ |  | 292,597 |  | 4.33 | ​
​

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