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Regulatory Capital - Summary of the Bank's Compliance (Details) $ in Thousands | Jun. 30, 2022 USD ($) | Dec. 31, 2021 USD ($)
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Savings Bank [Member] |  |
Tier I (leverage) capital: |  |
Tier I (leverage) capital, capital level, amount | $ 853,721 | $ 840,105
Tier I (leverage) capital, capital level, percent | 10.28 | 10.39
Tier I (leverage) capital, requirement to be well capitalized, amount | $ 415,167 | $ 404,366
Tier I (leverage) capital, requirement to be well capitalized, percent | 5.00 | 5.00
Tier I (leverage) capital, excess, amount | $ 438,554 | $ 435,739
Tier I (leverage) capital, excess, percent | 5.28 | 5.39
Common Equity Tier I risk-based capital: |  |
Common Equity Tier I risk-based capital, capital level, amount | $ 853,721 | $ 840,105
Common Equity Tier I risk-based capital, capital level, percent | 13.09 | 13.58
Common Equity Tier I risk-based capital, requirement to be well capitalized, amount | $ 423,985 | $ 402,100
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 | $ 429,736 | $ 438,005
Common Equity Tier I risk-based capital, excess, percent | 6.59% | 7.08%
Tier I risk-based capital: |  |
Tier I risk-based capital, capital level, amount | $ 853,721 | $ 840,105
Tier I risk-based capital, capital level, percent | 13.09 | 13.58
Tier I risk-based capital, requirement to be well capitalized, amount | $ 521,828 | $ 494,892
Tier I risk-based capital, requirement to be well capitalized, percent | 8.00 | 8.00
Tier I risk-based capital, excess, amount | $ 331,893 | $ 345,213
Tier I risk-based capital, excess, percent | 5.09 | 5.58
Total risk-based capital: |  |
Total risk-based capital, capital level, amount | $ 891,992 | $ 874,400
Total risk-based capital, capital level, percent | 13.67 | 14.13
Total risk-based capital, requirement to be well capitalized, amount | $ 652,285 | $ 618,615
Total risk-based capital, requirement to be well capitalized, percent | 10.00 | 10.00
Total risk-based capital, excess, amount | $ 239,707 | $ 255,785
Total risk-based capital, excess, percent | 3.67 | 4.13
Holding Company |  |
Tier I (leverage) capital: |  |
Tier I (leverage) capital, capital level, amount | $ 739,776 | $ 726,174
Tier I (leverage) capital, capital level, percent | 8.91 | 8.98
Tier I (leverage) capital, requirement to be well capitalized, amount | $ 415,221 | $ 404,422
Tier I (leverage) capital, requirement to be well capitalized, percent | 5.00 | 5.00
Tier I (leverage) capital, excess, amount | $ 324,555 | $ 321,752
Tier I (leverage) capital, excess, percent | 3.91 | 3.98
Common Equity Tier I risk-based capital: |  |
Common Equity Tier I risk-based capital, capital level, amount | $ 686,258 | $ 671,494
Common Equity Tier I risk-based capital, capital level, percent | 10.52 | 10.86
Common Equity Tier I risk-based capital, requirement to be well capitalized, amount | $ 423,976 | $ 401,836
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 | $ 262,282 | $ 269,658
Common Equity Tier I risk-based capital, excess, percent | 4.02% | 4.36%
Tier I risk-based capital: |  |
Tier I risk-based capital, capital level, amount | $ 739,776 | $ 726,174
Tier I risk-based capital, capital level, percent | 11.34 | 11.75
Tier I risk-based capital, requirement to be well capitalized, amount | $ 521,817 | $ 494,568
Tier I risk-based capital, requirement to be well capitalized, percent | 8.00 | 8.00
Tier I risk-based capital, excess, amount | $ 217,959 | $ 231,606
Tier I risk-based capital, excess, percent | 3.34 | 3.75
Total risk-based capital: |  |
Total risk-based capital, capital level, amount | $ 903,047 | $ 885,469
Total risk-based capital, capital level, percent | 13.84 | 14.32
Total risk-based capital, requirement to be well capitalized, amount | $ 652,271 | $ 618,210
Total risk-based capital, requirement to be well capitalized, percent | 10.00 | 10.00
Total risk-based capital, excess, amount | $ 250,776 | $ 267,259
Total risk-based capital, excess, percent | 3.84 | 4.32

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