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Regulatory Capital - Summary of the Bank's Compliance (Details) $ in Thousands | Jun. 30, 2023 USD ($) | Dec. 31, 2022 USD ($)
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Savings Bank [Member] |  |
Tier I (leverage) capital: |  |
Tier I (leverage) capital, capital level, amount | $ 914,191 | $ 915,628
Tier I (leverage) capital, capital level, percent | 0.1066 | 0.1056
Tier I (leverage) capital, requirement to be well-capitalized, amount | $ 428,900 | $ 433,667
Tier I (leverage) capital, requirement to be well-capitalized, percent | 0.0500 | 0.0500
Tier I (leverage) capital, excess, amount | $ 485,291 | $ 481,961
Tier I (leverage) capital, excess, percent | 0.0566 | 0.0556
Common Equity Tier I risk-based capital: |  |
Common Equity Tier I risk-based capital, capital level, amount | $ 914,191 | $ 915,628
Common Equity Tier I risk-based capital, capital level, percent | 0.1374 | 0.1379
Common Equity Tier I risk-based capital, requirement to be well-capitalized, amount | $ 432,376 | $ 431,734
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 | $ 481,815 | $ 483,894
Common Equity Tier I risk-based capital, excess, percent | 0.0724% | 0.0729%
Tier I risk-based capital: |  |
Tier I risk-based capital, capital level, amount | $ 914,191 | $ 915,628
Tier I risk-based capital, capital level, percent | 0.1374 | 0.1379
Tier I risk-based capital, requirement to be well-capitalized, amount | $ 532,155 | $ 531,365
Tier I risk-based capital, requirement to be well-capitalized, percent | 0.0800 | 0.0800
Tier I risk-based capital, excess, amount | $ 382,036 | $ 384,263
Tier I risk-based capital, excess, percent | 0.0574 | 0.0579
Total risk-based capital: |  |
Total risk-based capital, capital level, amount | $ 952,221 | $ 954,457
Total risk-based capital, capital level, percent | 0.1431 | 0.1437
Total risk-based capital, requirement to be well-capitalized, amount | $ 665,194 | $ 664,206
Total risk-based capital, requirement to be well-capitalized, percent | 0.1000 | 0.1000
Total risk-based capital, excess, amount | $ 287,027 | $ 290,251
Total risk-based capital, excess, percent | 0.0431 | 0.0437
Holding Company |  |
Tier I (leverage) capital: |  |
Tier I (leverage) capital, capital level, amount | $ 734,754 | $ 746,880
Tier I (leverage) capital, capital level, percent | 0.0854 | 0.0861
Tier I (leverage) capital, requirement to be well-capitalized, amount | $ 429,936 | $ 433,607
Tier I (leverage) capital, requirement to be well-capitalized, percent | 0.0500 | 0.0500
Tier I (leverage) capital, excess, amount | $ 304,818 | $ 313,273
Tier I (leverage) capital, excess, percent | 0.0354 | 0.0361
Common Equity Tier I risk-based capital: |  |
Common Equity Tier I risk-based capital, capital level, amount | $ 688,820 | $ 698,258
Common Equity Tier I risk-based capital, capital level, percent | 0.1036 | 0.1052
Common Equity Tier I risk-based capital, requirement to be well-capitalized, amount | $ 432,264 | $ 431,635
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 | $ 256,556 | $ 266,623
Common Equity Tier I risk-based capital, excess, percent | 0.0386% | 0.0402%
Tier I risk-based capital: |  |
Tier I risk-based capital, capital level, amount | $ 734,754 | $ 746,880
Tier I risk-based capital, capital level, percent | 0.1105 | 0.1125
Tier I risk-based capital, requirement to be well-capitalized, amount | $ 532,018 | $ 531,243
Tier I risk-based capital, requirement to be well-capitalized, percent | 0.0800 | 0.0800
Tier I risk-based capital, excess, amount | $ 202,736 | $ 215,637
Tier I risk-based capital, excess, percent | 0.0305 | 0.0325
Total risk-based capital: |  |
Total risk-based capital, capital level, amount | $ 962,784 | $ 975,709
Total risk-based capital, capital level, percent | 0.1448 | 0.1469
Total risk-based capital, requirement to be well-capitalized, amount | $ 665,022 | $ 664,054
Total risk-based capital, requirement to be well-capitalized, percent | 0.1000 | 0.1000
Total risk-based capital, excess, amount | $ 297,762 | $ 311,655
Total risk-based capital, excess, percent | 0.0448 | 0.0469

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