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v3.23.1

Regulatory Capital - Summary of the Bank's Compliance (Details) $ in Thousands | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
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Savings Bank [Member] |  |
Tier I (leverage) capital: |  |
Tier I (leverage) capital, capital level, amount | $ 906,437 | $ 915,628
Tier I (leverage) capital, capital level, percent | 0.1055 | 0.1056
Tier I (leverage) capital, requirement to be well capitalized, amount | $ 429,793 | $ 433,667
Tier I (leverage) capital, requirement to be well capitalized, percent | 0.0500 | 0.0500
Tier I (leverage) capital, excess, amount | $ 476,644 | $ 481,961
Tier I (leverage) capital, excess, percent | 0.0555 | 0.0556
Common Equity Tier I risk-based capital: |  |
Common Equity Tier I risk-based capital, capital level, amount | $ 906,437 | $ 915,628
Common Equity Tier I risk-based capital, capital level, percent | 0.1361 | 0.1379
Common Equity Tier I risk-based capital, requirement to be well capitalized, amount | $ 433,017 | $ 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 | $ 473,420 | $ 483,894
Common Equity Tier I risk-based capital, excess, percent | 0.0711% | 0.0729%
Tier I risk-based capital: |  |
Tier I risk-based capital, capital level, amount | $ 906,437 | $ 915,628
Tier I risk-based capital, capital level, percent | 0.1361 | 0.1379
Tier I risk-based capital, requirement to be well capitalized, amount | $ 532,944 | $ 531,365
Tier I risk-based capital, requirement to be well capitalized, percent | 0.0800 | 0.0800
Tier I risk-based capital, excess, amount | $ 373,493 | $ 384,263
Tier I risk-based capital, excess, percent | 0.0561 | 0.0579
Total risk-based capital: |  |
Total risk-based capital, capital level, amount | $ 944,683 | $ 954,457
Total risk-based capital, capital level, percent | 0.1418 | 0.1437
Total risk-based capital, requirement to be well capitalized, amount | $ 666,181 | $ 664,206
Total risk-based capital, requirement to be well capitalized, percent | 0.1000 | 0.1000
Total risk-based capital, excess, amount | $ 278,502 | $ 290,251
Total risk-based capital, excess, percent | 0.0418 | 0.0437
Holding Company |  |
Tier I (leverage) capital: |  |
Tier I (leverage) capital, capital level, amount | $ 737,138 | $ 746,880
Tier I (leverage) capital, capital level, percent | 0.0858 | 0.0861
Tier I (leverage) capital, requirement to be well capitalized, amount | $ 429,761 | $ 433,607
Tier I (leverage) capital, requirement to be well capitalized, percent | 0.0500 | 0.0500
Tier I (leverage) capital, excess, amount | $ 307,377 | $ 313,273
Tier I (leverage) capital, excess, percent | 0.0358 | 0.0361
Common Equity Tier I risk-based capital: |  |
Common Equity Tier I risk-based capital, capital level, amount | $ 690,846 | $ 698,258
Common Equity Tier I risk-based capital, capital level, percent | 0.1037 | 0.1052
Common Equity Tier I risk-based capital, requirement to be well capitalized, amount | $ 432,870 | $ 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 | $ 257,976 | $ 266,623
Common Equity Tier I risk-based capital, excess, percent | 0.0387% | 0.0402%
Tier I risk-based capital: |  |
Tier I risk-based capital, capital level, amount | $ 737,138 | $ 746,880
Tier I risk-based capital, capital level, percent | 0.1107 | 0.1125
Tier I risk-based capital, requirement to be well capitalized, amount | $ 532,763 | $ 531,243
Tier I risk-based capital, requirement to be well capitalized, percent | 0.0800 | 0.0800
Tier I risk-based capital, excess, amount | $ 204,375 | $ 215,637
Tier I risk-based capital, excess, percent | 0.0307 | 0.0325
Total risk-based capital: |  |
Total risk-based capital, capital level, amount | $ 965,384 | $ 975,709
Total risk-based capital, capital level, percent | 0.1450 | 0.1469
Total risk-based capital, requirement to be well capitalized, amount | $ 665,953 | $ 664,054
Total risk-based capital, requirement to be well capitalized, percent | 0.1000 | 0.1000
Total risk-based capital, excess, amount | $ 299,431 | $ 311,655
Total risk-based capital, excess, percent | 0.0450 | 0.0469

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