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Regulatory Capital - Summary of the Bank's Compliance (Details)
$ in Thousands
Mar. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Savings Bank [Member]    
Tier I (leverage) capital:    
Tier I (leverage) capital, capital level, amount $ 844,429 $ 840,105
Tier I (leverage) capital, capital level, percent 10.45 10.39
Tier I (leverage) capital, requirement to be well capitalized, amount $ 404,176 $ 404,366
Tier I (leverage) capital, requirement to be well capitalized, percent 5.00 5.00
Tier I (leverage) capital, excess, amount $ 440,253 $ 435,739
Tier I (leverage) capital, excess, percent 5.45 5.39
Common Equity Tier I risk-based capital:    
Common Equity Tier I risk-based capital, capital level, amount $ 844,429 $ 840,105
Common Equity Tier I risk-based capital, capital level, percent 13.55 13.58
Common Equity Tier I risk-based capital, requirement to be well capitalized, amount $ 405,045 $ 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 $ 439,384 $ 438,005
Common Equity Tier I risk-based capital, excess, percent 7.05% 7.08%
Tier I risk-based capital:    
Tier I risk-based capital, capital level, amount $ 844,429 $ 840,105
Tier I risk-based capital, capital level, percent 13.55 13.58
Tier I risk-based capital, requirement to be well capitalized, amount $ 498,518 $ 494,892
Tier I risk-based capital, requirement to be well capitalized, percent 8.00 8.00
Tier I risk-based capital, excess, amount $ 345,911 $ 345,213
Tier I risk-based capital, excess, percent 5.55 5.58
Total risk-based capital:    
Total risk-based capital, capital level, amount $ 880,754 $ 874,400
Total risk-based capital, capital level, percent 14.13 14.13
Total risk-based capital, requirement to be well capitalized, amount $ 623,147 $ 618,615
Total risk-based capital, requirement to be well capitalized, percent 10.00 10.00
Total risk-based capital, excess, amount $ 257,607 $ 255,785
Total risk-based capital, excess, percent 4.13 4.13
Holding Company    
Tier I (leverage) capital:    
Tier I (leverage) capital, capital level, amount $ 731,536 $ 726,174
Tier I (leverage) capital, capital level, percent 9.05 8.98
Tier I (leverage) capital, requirement to be well capitalized, amount $ 404,150 $ 404,422
Tier I (leverage) capital, requirement to be well capitalized, percent 5.00 5.00
Tier I (leverage) capital, excess, amount $ 327,386 $ 321,752
Tier I (leverage) capital, excess, percent 4.05 3.98
Common Equity Tier I risk-based capital:    
Common Equity Tier I risk-based capital, capital level, amount $ 675,434 $ 671,494
Common Equity Tier I risk-based capital, capital level, percent 10.84 10.86
Common Equity Tier I risk-based capital, requirement to be well capitalized, amount $ 405,081 $ 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 $ 270,353 $ 269,658
Common Equity Tier I risk-based capital, excess, percent 4.34% 4.36%
Tier I risk-based capital:    
Tier I risk-based capital, capital level, amount $ 731,536 $ 726,174
Tier I risk-based capital, capital level, percent 11.74 11.75
Tier I risk-based capital, requirement to be well capitalized, amount $ 498,562 $ 494,568
Tier I risk-based capital, requirement to be well capitalized, percent 8.00 8.00
Tier I risk-based capital, excess, amount $ 232,974 $ 231,606
Tier I risk-based capital, excess, percent 3.74 3.75
Total risk-based capital:    
Total risk-based capital, capital level, amount $ 892,861 $ 885,469
Total risk-based capital, capital level, percent 14.33 14.32
Total risk-based capital, requirement to be well capitalized, amount $ 623,202 $ 618,210
Total risk-based capital, requirement to be well capitalized, percent 10.00 10.00
Total risk-based capital, excess, amount $ 269,659 $ 267,259
Total risk-based capital, excess, percent 4.33 4.32