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Regulatory Capital (Tables) | 12 Months Ended
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Dec. 31, 2023
Notes Tables |
Summary of compliance with banking regulatory capital standards | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2023 |  | December 31, 2022 |
​ | ​ | ​ | ​ | ​ | Percent of | ​ | ​ | ​ | ​ | Percent of |
​ |  | Amount |  | Assets |  | Amount |  | Assets |
​ |  | (Dollars in thousands) | ​
Tier I (leverage) capital: |  | ​ |  |  |  |  | ​ |  |  |  | ​
Capital level | ​ | $ | 825,104 |  | 9.47 | % | $ | 915,628 |  | 10.56 | %
Requirement to be well-capitalized | ​ |  | 435,792 |  | 5.00 | ​ |  | 433,667 |  | 5.00 | ​
Excess | ​ |  | 389,312 |  | 4.47 | ​ |  | 481,961 |  | 5.56 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Common Equity Tier I risk-based capital: | ​ |  |  |  |  | ​ |  |  |  |  | ​
Capital level | ​ | $ | 825,104 |  | 12.22 | % | $ | 915,628 |  | 13.79 | %
Requirement to be well-capitalized | ​ |  | 438,878 |  | 6.50 | ​ |  | 431,734 |  | 6.50 | ​
Excess | ​ |  | 386,226 |  | 5.72 | ​ |  | 483,894 |  | 7.29 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Tier I risk-based capital: | ​ |  |  |  |  | ​ |  |  |  |  | ​
Capital level | ​ | $ | 825,104 |  | 12.22 | % | $ | 915,628 |  | 13.79 | %
Requirement to be well-capitalized | ​ |  | 540,157 |  | 8.00 | ​ |  | 531,365 |  | 8.00 | ​
Excess | ​ |  | 284,947 |  | 4.22 | ​ |  | 384,263 |  | 5.79 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total risk-based capital: | ​ |  |  |  |  | ​ |  |  |  |  | ​
Capital level | ​ | $ | 864,999 |  | 12.81 | % | $ | 954,457 |  | 14.37 | %
Requirement to be well-capitalized | ​ |  | 675,196 |  | 10.00 | ​ |  | 664,206 |  | 10.00 | ​
Excess | ​ |  | 189,803 |  | 2.81 | ​ |  | 290,251 |  | 4.37 | ​
Holding Company |
Notes Tables |
Summary of compliance with banking regulatory capital standards | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | December 31, 2023 |  | December 31, 2022 |
​ | ​ | ​ | ​ | ​ | Percent of | ​ | ​ | ​ | ​ | Percent of |
​ |  | Amount |  | Assets |  | Amount |  | Assets |
​ | ​ | (Dollars in thousands) |
Tier I (leverage) capital: |  | ​ |  |  |  |  | ​ |  |  |  | ​
Capital level | ​ | $ | 737,732 |  | 8.47 | % | $ | 746,880 |  | 8.61 | %
Requirement to be well-capitalized | ​ |  | 435,748 |  | 5.00 | ​ |  | 433,607 |  | 5.00 | ​
Excess | ​ |  | 301,984 |  | 3.47 | ​ |  | 313,273 |  | 3.61 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Common Equity Tier I risk-based capital: | ​ |  | ​ |  |  | ​ |  | ​ |  |  | ​
Capital level | ​ | $ | 691,754 |  | 10.25 | % | $ | 698,258 |  | 10.52 | %
Requirement to be well-capitalized | ​ |  | 438,770 |  | 6.50 | ​ |  | 431,635 |  | 6.50 | ​
Excess | ​ |  | 252,984 |  | 3.75 | ​ |  | 266,623 |  | 4.02 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Tier I risk-based capital: | ​ |  | ​ |  |  | ​ |  | ​ |  |  | ​
Capital level | ​ | $ | 737,732 |  | 10.93 | % | $ | 746,880 |  | 11.25 | %
Requirement to be well-capitalized | ​ |  | 540,024 |  | 8.00 | ​ |  | 531,243 |  | 8.00 | ​
Excess | ​ |  | 197,708 |  | 2.93 | ​ |  | 215,637 |  | 3.25 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total risk-based capital: | ​ |  | ​ |  |  | ​ |  | ​ |  |  | ​
Capital level | ​ | $ | 967,627 |  | 14.33 | % | $ | 975,709 |  | 14.69 | %
Requirement to be well-capitalized | ​ |  | 675,030 |  | 10.00 | ​ |  | 664,054 |  | 10.00 | ​
Excess | ​ |  | 292,597 |  | 4.33 | ​ |  | 311,655 |  | 4.69 | ​
​

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