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Regulatory Capital (Tables) | 9 Months Ended
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Sep. 30, 2024
Notes Tables |
Summary of compliance with banking regulatory capital standards | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30, 2024 |  | December 31, 2023 |
​ | ​ | ​ | ​ | ​ | Percent of | ​ | ​ | ​ | ​ | Percent of |
​ |  | Amount |  | Assets |  | Amount |  | Assets |
​ |  | (Dollars in thousands) | ​
Tier I (leverage) capital: |  | ​ |  |  |  |  | ​ |  |  |  | ​
Capital level | ​ | $ | 848,887 |  | 9.12 | % | $ | 825,104 |  | 9.47 | %
Requirement to be well-capitalized | ​ |  | 465,533 |  | 5.00 | ​ |  | 435,792 |  | 5.00 | ​
Excess | ​ |  | 383,354 |  | 4.12 | ​ |  | 389,312 |  | 4.47 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Common Equity Tier I risk-based capital: | ​ |  |  |  |  | ​ |  |  |  |  | ​
Capital level | ​ | $ | 848,887 |  | 12.50 | % | $ | 825,104 |  | 12.22 | %
Requirement to be well-capitalized | ​ |  | 441,458 |  | 6.50 | ​ |  | 438,878 |  | 6.50 | ​
Excess | ​ |  | 407,429 |  | 6.00 | ​ |  | 386,226 |  | 5.72 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Tier I risk-based capital: | ​ |  |  |  |  | ​ |  |  |  |  | ​
Capital level | ​ | $ | 848,887 |  | 12.50 | % | $ | 825,104 |  | 12.22 | %
Requirement to be well-capitalized | ​ |  | 543,332 |  | 8.00 | ​ |  | 540,157 |  | 8.00 | ​
Excess | ​ |  | 305,555 |  | 4.50 | ​ |  | 284,947 |  | 4.22 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total risk-based capital: | ​ |  |  |  |  | ​ |  |  |  |  | ​
Capital level | ​ | $ | 890,145 |  | 13.11 | % | $ | 864,999 |  | 12.81 | %
Requirement to be well-capitalized | ​ |  | 679,166 |  | 10.00 | ​ |  | 675,196 |  | 10.00 | ​
Excess | ​ |  | 210,979 |  | 3.11 | ​ |  | 189,803 |  | 2.81 | ​
Holding Company |
Notes Tables |
Summary of compliance with banking regulatory capital standards | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30, 2024 |  | December 31, 2023 |
​ | ​ | ​ | ​ | ​ | Percent of | ​ | ​ | ​ | ​ | Percent of |
​ |  | Amount |  | Assets |  | Amount |  | Assets |
​ | ​ | (Dollars in thousands) |
Tier I (leverage) capital: |  | ​ |  |  |  |  | ​ |  |  |  | ​
Capital level | ​ | $ | 735,984 |  | 7.91 | % | $ | 737,732 |  | 8.47 | %
Requirement to be well-capitalized | ​ |  | 465,509 |  | 5.00 | ​ |  | 435,748 |  | 5.00 | ​
Excess | ​ |  | 270,475 |  | 2.91 | ​ |  | 301,984 |  | 3.47 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Common Equity Tier I risk-based capital: | ​ |  | ​ |  |  | ​ |  | ​ |  |  | ​
Capital level | ​ | $ | 689,902 |  | 10.16 | % | $ | 691,754 |  | 10.25 | %
Requirement to be well-capitalized | ​ |  | 441,366 |  | 6.50 | ​ |  | 438,770 |  | 6.50 | ​
Excess | ​ |  | 248,536 |  | 3.66 | ​ |  | 252,984 |  | 3.75 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Tier I risk-based capital: | ​ |  | ​ |  |  | ​ |  | ​ |  |  | ​
Capital level | ​ | $ | 735,984 |  | 10.84 | % | $ | 737,732 |  | 10.93 | %
Requirement to be well-capitalized | ​ |  | 543,220 |  | 8.00 | ​ |  | 540,024 |  | 8.00 | ​
Excess | ​ |  | 192,764 |  | 2.84 | ​ |  | 197,708 |  | 2.93 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total risk-based capital: | ​ |  | ​ |  |  | ​ |  | ​ |  |  | ​
Capital level | ​ | $ | 967,242 |  | 14.24 | % | $ | 967,627 |  | 14.33 | %
Requirement to be well-capitalized | ​ |  | 679,025 |  | 10.00 | ​ |  | 675,030 |  | 10.00 | ​
Excess | ​ |  | 288,217 |  | 4.24 | ​ |  | 292,597 |  | 4.33 | ​
​

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