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Regulatory Capital - Summary of the Bank's Compliance (Details)
$ in Thousands
Jun. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Savings Bank [Member]    
Tier I (leverage) capital:    
Tier I (leverage) capital, capital level, amount $ 853,721 $ 840,105
Tier I (leverage) capital, capital level, percent 10.28 10.39
Tier I (leverage) capital, requirement to be well capitalized, amount $ 415,167 $ 404,366
Tier I (leverage) capital, requirement to be well capitalized, percent 5.00 5.00
Tier I (leverage) capital, excess, amount $ 438,554 $ 435,739
Tier I (leverage) capital, excess, percent 5.28 5.39
Common Equity Tier I risk-based capital:    
Common Equity Tier I risk-based capital, capital level, amount $ 853,721 $ 840,105
Common Equity Tier I risk-based capital, capital level, percent 13.09 13.58
Common Equity Tier I risk-based capital, requirement to be well capitalized, amount $ 423,985 $ 402,100
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 $ 429,736 $ 438,005
Common Equity Tier I risk-based capital, excess, percent 6.59% 7.08%
Tier I risk-based capital:    
Tier I risk-based capital, capital level, amount $ 853,721 $ 840,105
Tier I risk-based capital, capital level, percent 13.09 13.58
Tier I risk-based capital, requirement to be well capitalized, amount $ 521,828 $ 494,892
Tier I risk-based capital, requirement to be well capitalized, percent 8.00 8.00
Tier I risk-based capital, excess, amount $ 331,893 $ 345,213
Tier I risk-based capital, excess, percent 5.09 5.58
Total risk-based capital:    
Total risk-based capital, capital level, amount $ 891,992 $ 874,400
Total risk-based capital, capital level, percent 13.67 14.13
Total risk-based capital, requirement to be well capitalized, amount $ 652,285 $ 618,615
Total risk-based capital, requirement to be well capitalized, percent 10.00 10.00
Total risk-based capital, excess, amount $ 239,707 $ 255,785
Total risk-based capital, excess, percent 3.67 4.13
Holding Company    
Tier I (leverage) capital:    
Tier I (leverage) capital, capital level, amount $ 739,776 $ 726,174
Tier I (leverage) capital, capital level, percent 8.91 8.98
Tier I (leverage) capital, requirement to be well capitalized, amount $ 415,221 $ 404,422
Tier I (leverage) capital, requirement to be well capitalized, percent 5.00 5.00
Tier I (leverage) capital, excess, amount $ 324,555 $ 321,752
Tier I (leverage) capital, excess, percent 3.91 3.98
Common Equity Tier I risk-based capital:    
Common Equity Tier I risk-based capital, capital level, amount $ 686,258 $ 671,494
Common Equity Tier I risk-based capital, capital level, percent 10.52 10.86
Common Equity Tier I risk-based capital, requirement to be well capitalized, amount $ 423,976 $ 401,836
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 $ 262,282 $ 269,658
Common Equity Tier I risk-based capital, excess, percent 4.02% 4.36%
Tier I risk-based capital:    
Tier I risk-based capital, capital level, amount $ 739,776 $ 726,174
Tier I risk-based capital, capital level, percent 11.34 11.75
Tier I risk-based capital, requirement to be well capitalized, amount $ 521,817 $ 494,568
Tier I risk-based capital, requirement to be well capitalized, percent 8.00 8.00
Tier I risk-based capital, excess, amount $ 217,959 $ 231,606
Tier I risk-based capital, excess, percent 3.34 3.75
Total risk-based capital:    
Total risk-based capital, capital level, amount $ 903,047 $ 885,469
Total risk-based capital, capital level, percent 13.84 14.32
Total risk-based capital, requirement to be well capitalized, amount $ 652,271 $ 618,210
Total risk-based capital, requirement to be well capitalized, percent 10.00 10.00
Total risk-based capital, excess, amount $ 250,776 $ 267,259
Total risk-based capital, excess, percent 3.84 4.32