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Regulatory Capital - Summary of the Bank's Compliance (Details) $ in Thousands | Sep. 30, 2021 USD ($) | Dec. 31, 2020 USD ($)
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Savings Bank [Member] |  |
Tier I (leverage) capital: |  |
Tier I (leverage) capital, capital level, amount | $ 800,352 | $ 733,010
Tier I (leverage) capital, capital level, percent | 9.93 | 9.27
Tier I (leverage) capital, requirement to be well capitalized, amount | $ 403,092 | $ 395,510
Tier I (leverage) capital, requirement to be well capitalized, percent | 5.00 | 5.00
Tier I (leverage) capital, excess, amount | $ 397,260 | $ 337,500
Tier I (leverage) capital, excess, percent | 4.93 | 4.27
Common Equity Tier I risk-based capital: |  |
Common Equity Tier I risk-based capital, capital level, amount | $ 800,352 | $ 733,010
Common Equity Tier I risk-based capital, capital level, percent | 12.91 | 11.65
Common Equity Tier I risk-based capital, requirement to be well capitalized, amount | $ 402,849 | $ 408,929
Common Equity Tier I risk-based capital, requirement to be well capitalized, percent | 6.50% | 6.50%
Common Equity Tier I risk-based capital, excess, amount | $ 397,503 | $ 324,081
Common Equity Tier I risk-based capital, excess, percent | 6.41% | 5.15%
Tier I risk-based capital: |  |
Tier I risk-based capital, capital level, amount | $ 800,352 | $ 733,010
Tier I risk-based capital, capital level, percent | 12.91 | 11.65
Tier I risk-based capital, requirement to be well capitalized, amount | $ 495,814 | $ 503,297
Tier I risk-based capital, requirement to be well capitalized, percent | 8.00 | 8.00
Tier I risk-based capital, excess, amount | $ 304,538 | $ 229,713
Tier I risk-based capital, excess, percent | 4.91 | 3.65
Total risk-based capital: |  |
Total risk-based capital, capital level, amount | $ 834,131 | $ 773,807
Total risk-based capital, capital level, percent | 13.46 | 12.30
Total risk-based capital, requirement to be well capitalized, amount | $ 619,768 | $ 629,121
Total risk-based capital, requirement to be well capitalized, percent | 10.00 | 10.00
Total risk-based capital, excess, amount | $ 214,363 | $ 144,686
Total risk-based capital, excess, percent | 3.46 | 2.30
Holding Company |  |
Tier I (leverage) capital: |  |
Tier I (leverage) capital, capital level, amount | $ 711,276 | $ 662,987
Tier I (leverage) capital, capital level, percent | 8.83 | 8.38
Tier I (leverage) capital, requirement to be well capitalized, amount | $ 402,936 | $ 395,439
Tier I (leverage) capital, requirement to be well capitalized, percent | 5.00 | 5.00
Tier I (leverage) capital, excess, amount | $ 308,340 | $ 267,548
Tier I (leverage) capital, excess, percent | 3.83 | 3.38
Common Equity Tier I risk-based capital: |  |
Common Equity Tier I risk-based capital, capital level, amount | $ 661,340 | $ 621,247
Common Equity Tier I risk-based capital, capital level, percent | 10.68 | 9.88
Common Equity Tier I risk-based capital, requirement to be well capitalized, amount | $ 402,623 | $ 408,694
Common Equity Tier I risk-based capital, requirement to be well capitalized, percent | 6.50% | 6.50%
Common Equity Tier I risk-based capital, excess, amount | $ 258,717 | $ 212,553
Common Equity Tier I risk-based capital, excess, percent | 4.18% | 3.38%
Tier I risk-based capital: |  |
Tier I risk-based capital, capital level, amount | $ 711,276 | $ 662,987
Tier I risk-based capital, capital level, percent | 11.48 | 10.54
Tier I risk-based capital, requirement to be well capitalized, amount | $ 495,537 | $ 503,008
Tier I risk-based capital, requirement to be well capitalized, percent | 8.00 | 8.00
Tier I risk-based capital, excess, amount | $ 215,739 | $ 159,979
Tier I risk-based capital, excess, percent | 3.48 | 2.54
Total risk-based capital: |  |
Total risk-based capital, capital level, amount | $ 832,255 | $ 794,034
Total risk-based capital, capital level, percent | 13.44 | 12.63
Total risk-based capital, requirement to be well capitalized, amount | $ 619,421 | $ 628,760
Total risk-based capital, requirement to be well capitalized, percent | 10.00 | 10.00
Total risk-based capital, excess, amount | $ 212,834 | $ 165,274
Total risk-based capital, excess, percent | 3.44 | 2.63

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