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Regulatory Capital - Summary of the Bank's Compliance (Details)
$ in Thousands
Sep. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Savings Bank [Member]    
Tier I (leverage) capital:    
Tier I (leverage) capital, capital level, amount $ 859,779 $ 840,105
Tier I (leverage) capital, capital level, percent 0.1003 0.1039
Tier I (leverage) capital, requirement to be well capitalized, amount $ 428,594 $ 404,366
Tier I (leverage) capital, requirement to be well capitalized, percent 0.0500 0.0500
Tier I (leverage) capital, excess, amount $ 431,185 $ 435,739
Tier I (leverage) capital, excess, percent 0.0503 0.0539
Common Equity Tier I risk-based capital:    
Common Equity Tier I risk-based capital, capital level, amount $ 859,779 $ 840,105
Common Equity Tier I risk-based capital, capital level, percent 0.1285 0.1358
Common Equity Tier I risk-based capital, requirement to be well capitalized, amount $ 434,966 $ 402,100
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 $ 424,813 $ 438,005
Common Equity Tier I risk-based capital, excess, percent 0.0635% 0.0708%
Tier I risk-based capital:    
Tier I risk-based capital, capital level, amount $ 859,779 $ 840,105
Tier I risk-based capital, capital level, percent 0.1285 0.1358
Tier I risk-based capital, requirement to be well capitalized, amount $ 535,343 $ 494,892
Tier I risk-based capital, requirement to be well capitalized, percent 0.0800 0.0800
Tier I risk-based capital, excess, amount $ 324,436 $ 345,213
Tier I risk-based capital, excess, percent 0.0485 0.0558
Total risk-based capital:    
Total risk-based capital, capital level, amount $ 899,274 $ 874,400
Total risk-based capital, capital level, percent 0.1344 0.1413
Total risk-based capital, requirement to be well capitalized, amount $ 669,179 $ 618,615
Total risk-based capital, requirement to be well capitalized, percent 0.1000 0.1000
Total risk-based capital, excess, amount $ 230,095 $ 255,785
Total risk-based capital, excess, percent 0.0344 0.0413
Holding Company    
Tier I (leverage) capital:    
Tier I (leverage) capital, capital level, amount $ 749,526 $ 726,174
Tier I (leverage) capital, capital level, percent 0.0874 0.0898
Tier I (leverage) capital, requirement to be well capitalized, amount $ 428,619 $ 404,422
Tier I (leverage) capital, requirement to be well capitalized, percent 0.0500 0.0500
Tier I (leverage) capital, excess, amount $ 320,907 $ 321,752
Tier I (leverage) capital, excess, percent 0.0374 0.0398
Common Equity Tier I risk-based capital:    
Common Equity Tier I risk-based capital, capital level, amount $ 701,532 $ 671,494
Common Equity Tier I risk-based capital, capital level, percent 0.1049 0.1086
Common Equity Tier I risk-based capital, requirement to be well capitalized, amount $ 434,803 $ 401,836
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 $ 266,729 $ 269,658
Common Equity Tier I risk-based capital, excess, percent 0.0399% 0.0436%
Tier I risk-based capital:    
Tier I risk-based capital, capital level, amount $ 749,526 $ 726,174
Tier I risk-based capital, capital level, percent 0.1120 0.1175
Tier I risk-based capital, requirement to be well capitalized, amount $ 535,143 $ 494,568
Tier I risk-based capital, requirement to be well capitalized, percent 0.0800 0.0800
Tier I risk-based capital, excess, amount $ 214,383 $ 231,606
Tier I risk-based capital, excess, percent 0.0320 0.0375
Total risk-based capital:    
Total risk-based capital, capital level, amount $ 979,021 $ 885,469
Total risk-based capital, capital level, percent 0.1464 0.1432
Total risk-based capital, requirement to be well capitalized, amount $ 668,928 $ 618,210
Total risk-based capital, requirement to be well capitalized, percent 0.1000 0.1000
Total risk-based capital, excess, amount $ 310,093 $ 267,259
Total risk-based capital, excess, percent 0.0464 0.0432