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Regulatory Capital - Summary of the Bank's Compliance (Details) $ in Thousands | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
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Savings Bank [Member] |  |
Tier I (leverage) capital: |  |
Tier I (leverage) capital, capital level, amount | $ 840,105 | $ 733,010
Tier I (leverage) capital, capital level, percent | 10.39 | 9.27
Tier I (leverage) capital, requirement to be well capitalized, amount | $ 404,366 | $ 395,510
Tier I (leverage) capital, requirement to be well capitalized, percent | 5.00 | 5.00
Tier I (leverage) capital, excess, amount | $ 435,739 | $ 337,500
Tier I (leverage) capital, excess, percent | 5.39 | 4.27
Common Equity Tier I risk-based capital: |  |
Common Equity Tier I risk-based capital, capital level, amount | $ 840,105 | $ 733,010
Common Equity Tier I risk-based capital, capital level, percent | 13.58 | 11.65
Common Equity Tier I risk-based capital, requirement to be well capitalized, amount | $ 402,100 | $ 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 | $ 438,005 | $ 324,081
Common Equity Tier I risk-based capital, excess, percent | 7.08% | 5.15%
Tier I risk-based capital: |  |
Tier I risk-based capital, capital level, amount | $ 840,105 | $ 733,010
Tier I risk-based capital, capital level, percent | 13.58 | 11.65
Tier I risk-based capital, requirement to be well capitalized, amount | $ 494,892 | $ 503,297
Tier I risk-based capital, requirement to be well capitalized, percent | 8.00 | 8.00
Tier I risk-based capital, excess, amount | $ 345,213 | $ 229,713
Tier I risk-based capital, excess, percent | 5.58 | 3.65
Total risk-based capital: |  |
Total risk-based capital, capital level, amount | $ 874,400 | $ 773,807
Total risk-based capital, capital level, percent | 14.13 | 12.30
Total risk-based capital, requirement to be well capitalized, amount | $ 618,615 | $ 629,121
Total risk-based capital, requirement to be well capitalized, percent | 10.00 | 10.00
Total risk-based capital, excess, amount | $ 255,785 | $ 144,686
Total risk-based capital, excess, percent | 4.13 | 2.30
Holding Company |  |
Tier I (leverage) capital: |  |
Tier I (leverage) capital, capital level, amount | $ 726,174 | $ 662,987
Tier I (leverage) capital, capital level, percent | 8.98 | 8.38
Tier I (leverage) capital, requirement to be well capitalized, amount | $ 404,422 | $ 395,439
Tier I (leverage) capital, requirement to be well capitalized, percent | 5.00 | 5.00
Tier I (leverage) capital, excess, amount | $ 321,752 | $ 267,548
Tier I (leverage) capital, excess, percent | 3.98 | 3.38
Common Equity Tier I risk-based capital: |  |
Common Equity Tier I risk-based capital, capital level, amount | $ 671,494 | $ 621,247
Common Equity Tier I risk-based capital, capital level, percent | 10.86 | 9.88
Common Equity Tier I risk-based capital, requirement to be well capitalized, amount | $ 401,836 | $ 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 | $ 269,658 | $ 212,553
Common Equity Tier I risk-based capital, excess, percent | 4.36% | 3.38%
Tier I risk-based capital: |  |
Tier I risk-based capital, capital level, amount | $ 726,174 | $ 662,987
Tier I risk-based capital, capital level, percent | 11.75 | 10.54
Tier I risk-based capital, requirement to be well capitalized, amount | $ 494,568 | $ 503,008
Tier I risk-based capital, requirement to be well capitalized, percent | 8.00 | 8.00
Tier I risk-based capital, excess, amount | $ 231,606 | $ 159,979
Tier I risk-based capital, excess, percent | 3.75 | 2.54
Total risk-based capital: |  |
Total risk-based capital, capital level, amount | $ 885,469 | $ 794,034
Total risk-based capital, capital level, percent | 14.32 | 12.63
Total risk-based capital, requirement to be well capitalized, amount | $ 618,210 | $ 628,760
Total risk-based capital, requirement to be well capitalized, percent | 10.00 | 10.00
Total risk-based capital, excess, amount | $ 267,259 | $ 165,274
Total risk-based capital, excess, percent | 4.32 | 2.63

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