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Regulatory Capital (Tables) | 9 Months Ended
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Sep. 30, 2021
Notes Tables |
Summary of compliance with banking regulatory capital standards | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30, 2021 |  | December 31, 2020 |
​ | ​ | ​ | ​ | ​ | Percent of | ​ | ​ | ​ | ​ | Percent of |
​ |  | Amount |  | Assets |  | Amount |  | Assets |
​ |  | (Dollars in thousands) | ​
Tier I (leverage) capital: |  | ​ |  |  |  |  | ​ |  |  |  | ​
Capital level | ​ | $ | 800,352 |  | 9.93 | % | $ | 733,010 |  | 9.27 | %
Requirement to be well capitalized | ​ |  | 403,092 |  | 5.00 | ​ |  | 395,510 |  | 5.00 | ​
Excess | ​ |  | 397,260 |  | 4.93 | ​ |  | 337,500 |  | 4.27 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Common Equity Tier I risk-based capital: | ​ |  |  |  |  | ​ |  |  |  |  | ​
Capital level | ​ | $ | 800,352 |  | 12.91 | % | $ | 733,010 |  | 11.65 | %
Requirement to be well capitalized | ​ |  | 402,849 |  | 6.50 | ​ |  | 408,929 |  | 6.50 | ​
Excess | ​ |  | 397,503 |  | 6.41 | ​ |  | 324,081 |  | 5.15 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Tier 1 risk-based capital: | ​ |  |  |  |  | ​ |  |  |  |  | ​
Capital level | ​ | $ | 800,352 |  | 12.91 | % | $ | 733,010 |  | 11.65 | %
Requirement to be well capitalized | ​ |  | 495,814 |  | 8.00 | ​ |  | 503,297 |  | 8.00 | ​
Excess | ​ |  | 304,538 |  | 4.91 | ​ |  | 229,713 |  | 3.65 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total risk-based capital: | ​ |  |  |  |  | ​ |  |  |  |  | ​
Capital level | ​ | $ | 834,131 |  | 13.46 | % | $ | 773,807 |  | 12.30 | %
Requirement to be well capitalized | ​ |  | 619,768 |  | 10.00 | ​ |  | 629,121 |  | 10.00 | ​
Excess | ​ |  | 214,363 |  | 3.46 | ​ |  | 144,686 |  | 2.30 | ​
Holding Company |
Notes Tables |
Summary of compliance with banking regulatory capital standards | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | September 30, 2021 |  | December 31, 2020 |
​ | ​ | ​ | ​ | ​ | Percent of | ​ | ​ | ​ | ​ | Percent of |
​ |  | Amount |  | Assets |  | Amount |  | Assets |
​ | ​ | (Dollars in thousands) |
Tier I (leverage) capital: |  | ​ |  |  |  |  | ​ |  |  |  | ​
Capital level | ​ | $ | 711,276 |  | 8.83 | % | $ | 662,987 |  | 8.38 | %
Requirement to be well capitalized | ​ |  | 402,936 |  | 5.00 | ​ |  | 395,439 |  | 5.00 | ​
Excess | ​ |  | 308,340 |  | 3.83 | ​ |  | 267,548 |  | 3.38 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Common Equity Tier I risk-based capital: | ​ |  |  |  |  | ​ |  |  |  |  | ​
Capital level | ​ | $ | 661,340 |  | 10.68 | % | $ | 621,247 |  | 9.88 | %
Requirement to be well capitalized | ​ |  | 402,623 |  | 6.50 | ​ |  | 408,694 |  | 6.50 | ​
Excess | ​ |  | 258,717 |  | 4.18 | ​ |  | 212,553 |  | 3.38 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Tier 1 risk-based capital: | ​ |  |  |  |  | ​ |  |  |  |  | ​
Capital level | ​ | $ | 711,276 |  | 11.48 | % | $ | 662,987 |  | 10.54 | %
Requirement to be well capitalized | ​ |  | 495,537 |  | 8.00 | ​ |  | 503,008 |  | 8.00 | ​
Excess | ​ |  | 215,739 |  | 3.48 | ​ |  | 159,979 |  | 2.54 | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Total risk-based capital: | ​ |  |  |  |  | ​ |  |  |  |  | ​
Capital level | ​ | $ | 832,255 |  | 13.44 | % | $ | 794,034 |  | 12.63 | %
Requirement to be well capitalized | ​ |  | 619,421 |  | 10.00 | ​ |  | 628,760 |  | 10.00 | ​
Excess | ​ |  | 212,834 |  | 3.44 | ​ |  | 165,274 |  | 2.63 | ​

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- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958570-112826 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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