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Regulatory Capital - Summary of the Bank's Compliance (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Savings Bank [Member] |  |
Tier I (leverage) capital: |  |
Tier I (leverage) capital, capital level, amount | $ 733,010 | $ 680,749
Tier I (leverage) capital, capital level, percent | 9.27% | 9.65%
Tier I (leverage) capital, requirement to be well capitalized, amount | $ 395,510 | $ 352,581
Tier I (leverage) capital, requirement to be well capitalized, percent | 5.00% | 5.00%
Tier I (leverage) capital, excess, amount | $ 337,500 | $ 328,168
Tier I (leverage) capital, excess, percent | 4.27% | 4.65%
Common Equity Tier I risk-based capital: |  |
Common Equity Tier I risk-based capital, capital level, amount | $ 733,010 | $ 680,749
Common Equity Tier I risk-based capital, capital level, percent | 11.65% | 13.02%
Common Equity Tier I risk-based capital, requirement to be well capitalized, amount | $ 408,929 | $ 339,944
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 | $ 324,081 | $ 340,805
Common Equity Tier I risk-based capital, excess, percent | 5.15% | 6.52%
Tier I risk-based capital: |  |
Tier I risk-based capital, capital level, amount | $ 733,010 | $ 680,749
Tier I risk-based capital, capital level, percent | 11.65% | 13.02%
Tier I risk-based capital, requirement to be well capitalized, amount | $ 503,297 | $ 418,393
Tier I risk-based capital, requirement to be well capitalized, percent | 8.00% | 8.00%
Tier I risk-based capital, excess, amount | $ 229,713 | $ 262,356
Tier I risk-based capital, excess, percent | 3.65% | 5.02%
Total risk-based capital: |  |
Total risk-based capital, capital level, amount | $ 773,807 | $ 702,500
Total risk-based capital, capital level, percent | 12.30% | 13.43%
Total risk-based capital, requirement to be well capitalized, amount | $ 629,121 | $ 522,991
Total risk-based capital, requirement to be well capitalized, percent | 10.00% | 10.00%
Total risk-based capital, excess, amount | $ 144,686 | $ 179,509
Total risk-based capital, excess, percent | 2.30% | 3.43%
Holding Company |  |
Tier I (leverage) capital: |  |
Tier I (leverage) capital, capital level, amount | $ 662,987 | $ 615,500
Tier I (leverage) capital, capital level, percent | 8.38% | 8.73%
Tier I (leverage) capital, requirement to be well capitalized, amount | $ 395,439 | $ 352,581
Tier I (leverage) capital, requirement to be well capitalized, percent | 5.00% | 5.00%
Tier I (leverage) capital, excess, amount | $ 267,548 | $ 262,919
Tier I (leverage) capital, excess, percent | 3.38% | 3.73%
Common Equity Tier I risk-based capital: |  |
Common Equity Tier I risk-based capital, capital level, amount | $ 621,247 | $ 572,651
Common Equity Tier I risk-based capital, capital level, percent | 9.88% | 10.95%
Common Equity Tier I risk-based capital, requirement to be well capitalized, amount | $ 408,694 | $ 339,929
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 | $ 212,553 | $ 232,722
Common Equity Tier I risk-based capital, excess, percent | 3.38% | 4.45%
Tier I risk-based capital: |  |
Tier I risk-based capital, capital level, amount | $ 662,987 | $ 615,500
Tier I risk-based capital, capital level, percent | 10.54% | 11.77%
Tier I risk-based capital, requirement to be well capitalized, amount | $ 503,008 | $ 418,374
Tier I risk-based capital, requirement to be well capitalized, percent | 8.00% | 8.00%
Tier I risk-based capital, excess, amount | $ 159,979 | $ 197,126
Tier I risk-based capital, excess, percent | 2.54% | 3.77%
Total risk-based capital: |  |
Total risk-based capital, capital level, amount | $ 794,034 | $ 712,251
Total risk-based capital, capital level, percent | 12.63% | 13.62%
Total risk-based capital, requirement to be well capitalized, amount | $ 628,760 | $ 522,967
Total risk-based capital, requirement to be well capitalized, percent | 10.00% | 10.00%
Total risk-based capital, excess, amount | $ 165,274 | $ 189,284
Total risk-based capital, excess, percent | 2.63% | 3.62%

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