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Regulatory Capital - Summary of the Bank's Compliance (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Savings Bank [Member]    
Tier I (leverage) capital:    
Tier I (leverage) capital, capital level, amount $ 754,487 $ 733,010
Tier I (leverage) capital, capital level, percent 9.38% 9.27%
Tier I (leverage) capital, requirement to be well capitalized, amount $ 402,389 $ 395,510
Tier I (leverage) capital, requirement to be well capitalized, percent 5.00% 5.00%
Tier I (leverage) capital, excess, amount $ 352,098 $ 337,500
Tier I (leverage) capital, excess, percent 4.38% 4.27%
Common Equity Tier I risk-based capital:    
Common Equity Tier I risk-based capital, capital level, amount $ 754,487 $ 733,010
Common Equity Tier I risk-based capital, capital level, percent 12.03% 11.65%
Common Equity Tier I risk-based capital, requirement to be well capitalized, amount $ 407,515 $ 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 $ 346,972 $ 324,081
Common Equity Tier I risk-based capital, excess, percent 5.53% 5.15%
Tier I risk-based capital:    
Tier I risk-based capital, capital level, amount $ 754,487 $ 733,010
Tier I risk-based capital, capital level, percent 12.03% 11.65%
Tier I risk-based capital, requirement to be well capitalized, amount $ 501,557 $ 503,297
Tier I risk-based capital, requirement to be well capitalized, percent 8.00% 8.00%
Tier I risk-based capital, excess, amount $ 252,930 $ 229,713
Tier I risk-based capital, excess, percent 4.03% 3.65%
Total risk-based capital:    
Total risk-based capital, capital level, amount $ 794,866 $ 773,807
Total risk-based capital, capital level, percent 12.68% 12.30%
Total risk-based capital, requirement to be well capitalized, amount $ 626,946 $ 629,121
Total risk-based capital, requirement to be well capitalized, percent 10.00% 10.00%
Total risk-based capital, excess, amount $ 167,920 $ 144,686
Total risk-based capital, excess, percent 2.68% 2.30%
Holding Company    
Tier I (leverage) capital:    
Tier I (leverage) capital, capital level, amount $ 679,343 $ 662,987
Tier I (leverage) capital, capital level, percent 8.44% 8.38%
Tier I (leverage) capital, requirement to be well capitalized, amount $ 402,232 $ 395,439
Tier I (leverage) capital, requirement to be well capitalized, percent 5.00% 5.00%
Tier I (leverage) capital, excess, amount $ 277,111 $ 267,548
Tier I (leverage) capital, excess, percent 3.44% 3.38%
Common Equity Tier I risk-based capital:    
Common Equity Tier I risk-based capital, capital level, amount $ 636,071 $ 621,247
Common Equity Tier I risk-based capital, capital level, percent 10.15% 9.88%
Common Equity Tier I risk-based capital, requirement to be well capitalized, amount $ 407,283 $ 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 $ 228,788 $ 212,553
Common Equity Tier I risk-based capital, excess, percent 3.65% 3.38%
Tier I risk-based capital:    
Tier I risk-based capital, capital level, amount $ 679,343 $ 662,987
Tier I risk-based capital, capital level, percent 10.84% 10.54%
Tier I risk-based capital, requirement to be well capitalized, amount $ 501,271 $ 503,008
Tier I risk-based capital, requirement to be well capitalized, percent 8.00% 8.00%
Tier I risk-based capital, excess, amount $ 178,072 $ 159,979
Tier I risk-based capital, excess, percent 2.84% 2.54%
Total risk-based capital:    
Total risk-based capital, capital level, amount $ 806,922 $ 794,034
Total risk-based capital, capital level, percent 12.88% 12.63%
Total risk-based capital, requirement to be well capitalized, amount $ 626,589 $ 628,760
Total risk-based capital, requirement to be well capitalized, percent 10.00% 10.00%
Total risk-based capital, excess, amount $ 180,333 $ 165,274
Total risk-based capital, excess, percent 2.88% 2.63%