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Regulatory Capital - Summary of the Bank's Compliance (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Savings Bank [Member] |  |
Tier I (leverage) capital: |  |
Tier I (leverage) capital, capital level, amount | $ 754,487 | $ 733,010
Tier I (leverage) capital, capital level, percent | 9.38% | 9.27%
Tier I (leverage) capital, requirement to be well capitalized, amount | $ 402,389 | $ 395,510
Tier I (leverage) capital, requirement to be well capitalized, percent | 5.00% | 5.00%
Tier I (leverage) capital, excess, amount | $ 352,098 | $ 337,500
Tier I (leverage) capital, excess, percent | 4.38% | 4.27%
Common Equity Tier I risk-based capital: |  |
Common Equity Tier I risk-based capital, capital level, amount | $ 754,487 | $ 733,010
Common Equity Tier I risk-based capital, capital level, percent | 12.03% | 11.65%
Common Equity Tier I risk-based capital, requirement to be well capitalized, amount | $ 407,515 | $ 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 | $ 346,972 | $ 324,081
Common Equity Tier I risk-based capital, excess, percent | 5.53% | 5.15%
Tier I risk-based capital: |  |
Tier I risk-based capital, capital level, amount | $ 754,487 | $ 733,010
Tier I risk-based capital, capital level, percent | 12.03% | 11.65%
Tier I risk-based capital, requirement to be well capitalized, amount | $ 501,557 | $ 503,297
Tier I risk-based capital, requirement to be well capitalized, percent | 8.00% | 8.00%
Tier I risk-based capital, excess, amount | $ 252,930 | $ 229,713
Tier I risk-based capital, excess, percent | 4.03% | 3.65%
Total risk-based capital: |  |
Total risk-based capital, capital level, amount | $ 794,866 | $ 773,807
Total risk-based capital, capital level, percent | 12.68% | 12.30%
Total risk-based capital, requirement to be well capitalized, amount | $ 626,946 | $ 629,121
Total risk-based capital, requirement to be well capitalized, percent | 10.00% | 10.00%
Total risk-based capital, excess, amount | $ 167,920 | $ 144,686
Total risk-based capital, excess, percent | 2.68% | 2.30%
Holding Company |  |
Tier I (leverage) capital: |  |
Tier I (leverage) capital, capital level, amount | $ 679,343 | $ 662,987
Tier I (leverage) capital, capital level, percent | 8.44% | 8.38%
Tier I (leverage) capital, requirement to be well capitalized, amount | $ 402,232 | $ 395,439
Tier I (leverage) capital, requirement to be well capitalized, percent | 5.00% | 5.00%
Tier I (leverage) capital, excess, amount | $ 277,111 | $ 267,548
Tier I (leverage) capital, excess, percent | 3.44% | 3.38%
Common Equity Tier I risk-based capital: |  |
Common Equity Tier I risk-based capital, capital level, amount | $ 636,071 | $ 621,247
Common Equity Tier I risk-based capital, capital level, percent | 10.15% | 9.88%
Common Equity Tier I risk-based capital, requirement to be well capitalized, amount | $ 407,283 | $ 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 | $ 228,788 | $ 212,553
Common Equity Tier I risk-based capital, excess, percent | 3.65% | 3.38%
Tier I risk-based capital: |  |
Tier I risk-based capital, capital level, amount | $ 679,343 | $ 662,987
Tier I risk-based capital, capital level, percent | 10.84% | 10.54%
Tier I risk-based capital, requirement to be well capitalized, amount | $ 501,271 | $ 503,008
Tier I risk-based capital, requirement to be well capitalized, percent | 8.00% | 8.00%
Tier I risk-based capital, excess, amount | $ 178,072 | $ 159,979
Tier I risk-based capital, excess, percent | 2.84% | 2.54%
Total risk-based capital: |  |
Total risk-based capital, capital level, amount | $ 806,922 | $ 794,034
Total risk-based capital, capital level, percent | 12.88% | 12.63%
Total risk-based capital, requirement to be well capitalized, amount | $ 626,589 | $ 628,760
Total risk-based capital, requirement to be well capitalized, percent | 10.00% | 10.00%
Total risk-based capital, excess, amount | $ 180,333 | $ 165,274
Total risk-based capital, excess, percent | 2.88% | 2.63%

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- Definition The amount by which the company's Total Capital exceeds the minimum required for capital adequacy purposes. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=117337116&loc=SL5958568-112826 + Details
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