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Regulatory Capital - Summary of the Bank's Compliance (Details) $ in Thousands | Jun. 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 | $ 778,707 | $ 733,010
Tier I (leverage) capital, capital level, percent | 9.49 | 9.27
Tier I (leverage) capital, requirement to be well capitalized, amount | $ 410,271 | $ 395,510
Tier I (leverage) capital, requirement to be well capitalized, percent | 5.00 | 5.00
Tier I (leverage) capital, excess, amount | $ 368,436 | $ 337,500
Tier I (leverage) capital, excess, percent | 4.49 | 4.27
Common Equity Tier I risk-based capital: |  |
Common Equity Tier I risk-based capital, capital level, amount | $ 778,707 | $ 733,010
Common Equity Tier I risk-based capital, capital level, percent | 12.27 | 11.65
Common Equity Tier I risk-based capital, requirement to be well capitalized, amount | $ 412,598 | $ 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 | $ 366,109 | $ 324,081
Common Equity Tier I risk-based capital, excess, percent | 5.77% | 5.15%
Tier I risk-based capital: |  |
Tier I risk-based capital, capital level, amount | $ 778,707 | $ 733,010
Tier I risk-based capital, capital level, percent | 12.27 | 11.65
Tier I risk-based capital, requirement to be well capitalized, amount | $ 507,813 | $ 503,297
Tier I risk-based capital, requirement to be well capitalized, percent | 8.00 | 8.00
Tier I risk-based capital, excess, amount | $ 270,894 | $ 229,713
Tier I risk-based capital, excess, percent | 4.27 | 3.65
Total risk-based capital: |  |
Total risk-based capital, capital level, amount | $ 817,410 | $ 773,807
Total risk-based capital, capital level, percent | 12.88 | 12.30
Total risk-based capital, requirement to be well capitalized, amount | $ 634,767 | $ 629,121
Total risk-based capital, requirement to be well capitalized, percent | 10.00 | 10.00
Total risk-based capital, excess, amount | $ 182,643 | $ 144,686
Total risk-based capital, excess, percent | 2.88 | 2.30
Holding Company |  |
Tier I (leverage) capital: |  |
Tier I (leverage) capital, capital level, amount | $ 697,591 | $ 662,987
Tier I (leverage) capital, capital level, percent | 8.50 | 8.38
Tier I (leverage) capital, requirement to be well capitalized, amount | $ 410,118 | $ 395,439
Tier I (leverage) capital, requirement to be well capitalized, percent | 5.00 | 5.00
Tier I (leverage) capital, excess, amount | $ 287,473 | $ 267,548
Tier I (leverage) capital, excess, percent | 3.50 | 3.38
Common Equity Tier I risk-based capital: |  |
Common Equity Tier I risk-based capital, capital level, amount | $ 649,367 | $ 621,247
Common Equity Tier I risk-based capital, capital level, percent | 10.24 | 9.88
Common Equity Tier I risk-based capital, requirement to be well capitalized, amount | $ 412,365 | $ 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 | $ 237,002 | $ 212,553
Common Equity Tier I risk-based capital, excess, percent | 3.74% | 3.38%
Tier I risk-based capital: |  |
Tier I risk-based capital, capital level, amount | $ 697,591 | $ 662,987
Tier I risk-based capital, capital level, percent | 11.00 | 10.54
Tier I risk-based capital, requirement to be well capitalized, amount | $ 507,526 | $ 503,008
Tier I risk-based capital, requirement to be well capitalized, percent | 8.00 | 8.00
Tier I risk-based capital, excess, amount | $ 190,065 | $ 159,979
Tier I risk-based capital, excess, percent | 3.00 | 2.54
Total risk-based capital: |  |
Total risk-based capital, capital level, amount | $ 823,494 | $ 794,034
Total risk-based capital, capital level, percent | 12.98 | 12.63
Total risk-based capital, requirement to be well capitalized, amount | $ 634,408 | $ 628,760
Total risk-based capital, requirement to be well capitalized, percent | 10.00 | 10.00
Total risk-based capital, excess, amount | $ 189,086 | $ 165,274
Total risk-based capital, excess, percent | 2.98 | 2.63

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