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Regulatory Capital - Summary of the Bank's Compliance (Details)
$ in Thousands
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Savings Bank [Member]    
Tier I (leverage) capital:    
Tier I (leverage) capital, capital level, amount $ 778,707 $ 733,010
Tier I (leverage) capital, capital level, percent 9.49 9.27
Tier I (leverage) capital, requirement to be well capitalized, amount $ 410,271 $ 395,510
Tier I (leverage) capital, requirement to be well capitalized, percent 5.00 5.00
Tier I (leverage) capital, excess, amount $ 368,436 $ 337,500
Tier I (leverage) capital, excess, percent 4.49 4.27
Common Equity Tier I risk-based capital:    
Common Equity Tier I risk-based capital, capital level, amount $ 778,707 $ 733,010
Common Equity Tier I risk-based capital, capital level, percent 12.27 11.65
Common Equity Tier I risk-based capital, requirement to be well capitalized, amount $ 412,598 $ 408,929
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 $ 366,109 $ 324,081
Common Equity Tier I risk-based capital, excess, percent 5.77% 5.15%
Tier I risk-based capital:    
Tier I risk-based capital, capital level, amount $ 778,707 $ 733,010
Tier I risk-based capital, capital level, percent 12.27 11.65
Tier I risk-based capital, requirement to be well capitalized, amount $ 507,813 $ 503,297
Tier I risk-based capital, requirement to be well capitalized, percent 8.00 8.00
Tier I risk-based capital, excess, amount $ 270,894 $ 229,713
Tier I risk-based capital, excess, percent 4.27 3.65
Total risk-based capital:    
Total risk-based capital, capital level, amount $ 817,410 $ 773,807
Total risk-based capital, capital level, percent 12.88 12.30
Total risk-based capital, requirement to be well capitalized, amount $ 634,767 $ 629,121
Total risk-based capital, requirement to be well capitalized, percent 10.00 10.00
Total risk-based capital, excess, amount $ 182,643 $ 144,686
Total risk-based capital, excess, percent 2.88 2.30
Holding Company    
Tier I (leverage) capital:    
Tier I (leverage) capital, capital level, amount $ 697,591 $ 662,987
Tier I (leverage) capital, capital level, percent 8.50 8.38
Tier I (leverage) capital, requirement to be well capitalized, amount $ 410,118 $ 395,439
Tier I (leverage) capital, requirement to be well capitalized, percent 5.00 5.00
Tier I (leverage) capital, excess, amount $ 287,473 $ 267,548
Tier I (leverage) capital, excess, percent 3.50 3.38
Common Equity Tier I risk-based capital:    
Common Equity Tier I risk-based capital, capital level, amount $ 649,367 $ 621,247
Common Equity Tier I risk-based capital, capital level, percent 10.24 9.88
Common Equity Tier I risk-based capital, requirement to be well capitalized, amount $ 412,365 $ 408,694
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 $ 237,002 $ 212,553
Common Equity Tier I risk-based capital, excess, percent 3.74% 3.38%
Tier I risk-based capital:    
Tier I risk-based capital, capital level, amount $ 697,591 $ 662,987
Tier I risk-based capital, capital level, percent 11.00 10.54
Tier I risk-based capital, requirement to be well capitalized, amount $ 507,526 $ 503,008
Tier I risk-based capital, requirement to be well capitalized, percent 8.00 8.00
Tier I risk-based capital, excess, amount $ 190,065 $ 159,979
Tier I risk-based capital, excess, percent 3.00 2.54
Total risk-based capital:    
Total risk-based capital, capital level, amount $ 823,494 $ 794,034
Total risk-based capital, capital level, percent 12.98 12.63
Total risk-based capital, requirement to be well capitalized, amount $ 634,408 $ 628,760
Total risk-based capital, requirement to be well capitalized, percent 10.00 10.00
Total risk-based capital, excess, amount $ 189,086 $ 165,274
Total risk-based capital, excess, percent 2.98 2.63