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Regulatory Capital - Summary of the Bank's Compliance (Details) $ in Thousands | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($)
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Savings Bank [Member] |  |
Tier I (leverage) capital: |  |
Tier I (leverage) capital, capital level, amount | $ 915,628 | $ 840,105
Tier I (leverage) capital, capital level, percent | 0.1056 | 0.1039
Tier I (leverage) capital, requirement to be well capitalized, amount | $ 433,667 | $ 404,366
Tier I (leverage) capital, requirement to be well capitalized, percent | 0.0500 | 0.0500
Tier I (leverage) capital, excess, amount | $ 481,961 | $ 435,739
Tier I (leverage) capital, excess, percent | 0.0556 | 0.0539
Common Equity Tier I risk-based capital: |  |
Common Equity Tier I risk-based capital, capital level, amount | $ 915,628 | $ 840,105
Common Equity Tier I risk-based capital, capital level, percent | 0.1379 | 0.1358
Common Equity Tier I risk-based capital, requirement to be well capitalized, amount | $ 431,734 | $ 402,100
Common Equity Tier I risk-based capital, requirement to be well capitalized, percent | 0.065% | 0.065%
Common Equity Tier I risk-based capital, excess, amount | $ 483,894 | $ 438,005
Common Equity Tier I risk-based capital, excess, percent | 0.0729% | 0.0708%
Tier I risk-based capital: |  |
Tier I risk-based capital, capital level, amount | $ 915,628 | $ 840,105
Tier I risk-based capital, capital level, percent | 0.1379 | 0.1358
Tier I risk-based capital, requirement to be well capitalized, amount | $ 531,365 | $ 494,892
Tier I risk-based capital, requirement to be well capitalized, percent | 0.0800 | 0.0800
Tier I risk-based capital, excess, amount | $ 384,263 | $ 345,213
Tier I risk-based capital, excess, percent | 0.0579 | 0.0558
Total risk-based capital: |  |
Total risk-based capital, capital level, amount | $ 954,457 | $ 874,400
Total risk-based capital, capital level, percent | 0.1437 | 0.1413
Total risk-based capital, requirement to be well capitalized, amount | $ 664,206 | $ 618,615
Total risk-based capital, requirement to be well capitalized, percent | 0.1000 | 0.1000
Total risk-based capital, excess, amount | $ 290,251 | $ 255,785
Total risk-based capital, excess, percent | 0.0437 | 0.0413
Holding Company |  |
Tier I (leverage) capital: |  |
Tier I (leverage) capital, capital level, amount | $ 746,880 | $ 726,174
Tier I (leverage) capital, capital level, percent | 0.0861 | 0.0898
Tier I (leverage) capital, requirement to be well capitalized, amount | $ 433,607 | $ 404,422
Tier I (leverage) capital, requirement to be well capitalized, percent | 0.0500 | 0.0500
Tier I (leverage) capital, excess, amount | $ 313,273 | $ 321,752
Tier I (leverage) capital, excess, percent | 0.0361 | 0.0398
Common Equity Tier I risk-based capital: |  |
Common Equity Tier I risk-based capital, capital level, amount | $ 698,258 | $ 671,494
Common Equity Tier I risk-based capital, capital level, percent | 0.1052 | 0.1086
Common Equity Tier I risk-based capital, requirement to be well capitalized, amount | $ 431,635 | $ 401,836
Common Equity Tier I risk-based capital, requirement to be well capitalized, percent | 0.065% | 0.065%
Common Equity Tier I risk-based capital, excess, amount | $ 266,623 | $ 269,658
Common Equity Tier I risk-based capital, excess, percent | 0.0402% | 0.0436%
Tier I risk-based capital: |  |
Tier I risk-based capital, capital level, amount | $ 746,880 | $ 726,174
Tier I risk-based capital, capital level, percent | 0.1125 | 0.1175
Tier I risk-based capital, requirement to be well capitalized, amount | $ 531,243 | $ 494,568
Tier I risk-based capital, requirement to be well capitalized, percent | 0.0800 | 0.0800
Tier I risk-based capital, excess, amount | $ 215,637 | $ 231,606
Tier I risk-based capital, excess, percent | 0.0325 | 0.0375
Total risk-based capital: |  |
Total risk-based capital, capital level, amount | $ 975,709 | $ 885,469
Total risk-based capital, capital level, percent | 0.1469 | 0.1432
Total risk-based capital, requirement to be well capitalized, amount | $ 664,054 | $ 618,210
Total risk-based capital, requirement to be well capitalized, percent | 0.1000 | 0.1000
Total risk-based capital, excess, amount | $ 311,655 | $ 267,259
Total risk-based capital, excess, percent | 0.0469 | 0.0432

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