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Regulatory Capital Requirements (Details)
$ in Thousands
Sep. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Total Capital (to Risk-Weighted Assets)    
Total Capital (to Risk-Weighted Assets), Actual Amount $ 785,198 $ 814,505
Total Capital (to Risk-Weighted Assets), Actual Ratio 0.156 0.174
Total Capital (to Risk-Weighted Assets), For minimum capital adequacy purposes, Amount $ 403,006 $ 374,650
Total Capital (to Risk-Weighted Assets), For minimum capital adequacy purposes, Ratio 0.08 0.08
Total Capital (to Risk-Weighted Assets), To be well capitalized under prompt corrective action provisions, Amount $ 503,757 $ 468,313
Total Capital (to Risk-Weighted Assets), To be well capitalized under prompt corrective action provisions, Ratio 0.10 0.10
Tier I Capital (to Risk-Weighted Assets)    
Tier I Capital (to Risk-Weighted Assets), Actual Amount $ 739,460 $ 772,558
Tier I Capital (to Risk-Weighted Assets), Actual Ratio 0.147 0.165
Tier I Capital (to Risk-Weighted Assets), For minimum capital adequacy purposes, Amount $ 302,254 $ 280,988
Tier I Capital (to Risk-Weighted Assets), For minimum capital adequacy purposes, Ratio 0.06 0.06
Tier I Capital (to Risk-Weighted Assets), To be well capitalized under prompt corrective action provisions, Amount $ 403,006 $ 374,650
Tier I Capital (to Risk-Weighted Assets), To be well capitalized under prompt corrective action provisions, Ratio 0.08 0.08
Common Equity Tier I Capital (to Risk-Weighted Assets)    
Common Equity Tier I Capital (to Risk-Weighted Assets), Actual Amount $ 739,460 $ 772,558
Common Equity Tier I Capital (to Risk-Weighted Assets), Actual Ratio 0.147 0.165
Common Equity Tier I Capital (to Risk-Weighted Assets), For minimum capital adequacy purposes, Amount $ 226,691 $ 210,741
Common Equity Tier I Capital (to Risk-Weighted Assets), For minimum capital adequacy purposes, Ratio 0.045 0.045
Common Equity Tier I Capital (to Risk-Weighted Assets), To be well capitalized under prompt corrective action provisions, Amount $ 327,442 $ 304,403
Common Equity Tier I Capital (to Risk-Weighted Assets), To be well capitalized under prompt corrective action provisions, Ratio 0.065 0.065
Tier I Capital (to Total Average Assets)    
Tier I Capital (to Total Average Assets), Actual Amount $ 739,460 $ 772,558
Tier I Capital (to Total Average Assets), Actual Ratio 0.14 0.153
Tier I Capital (to Total Average Assets), For minimum capital adequacy purposes, Amount $ 211,148 $ 202,436
Tier I Capital (to Total Average Assets), For minimum capital adequacy purposes, Ratio 0.04 0.04
Tier I Capital (to Total Average Assets), To be well capitalized under prompt corrective action provisions, Amount $ 263,935 $ 253,045
Tier I Capital (to Total Average Assets), To be well capitalized under prompt corrective action provisions, Ratio 0.05 0.05
Needham Bank [Member]    
Total Capital (to Risk-Weighted Assets)    
Total Capital (to Risk-Weighted Assets), Actual Amount $ 699,582 $ 656,103
Total Capital (to Risk-Weighted Assets), Actual Ratio 0.139 0.141
Total Capital (to Risk-Weighted Assets), For minimum capital adequacy purposes, Amount $ 401,533 $ 372,083
Total Capital (to Risk-Weighted Assets), For minimum capital adequacy purposes, Ratio 0.08 0.08
Total Capital (to Risk-Weighted Assets), To be well capitalized under prompt corrective action provisions, Amount $ 501,917 $ 465,104
Total Capital (to Risk-Weighted Assets), To be well capitalized under prompt corrective action provisions, Ratio 0.10 0.10
Tier I Capital (to Risk-Weighted Assets)    
Tier I Capital (to Risk-Weighted Assets), Actual Amount $ 653,844 $ 614,156
Tier I Capital (to Risk-Weighted Assets), Actual Ratio 0.13 0.132
Tier I Capital (to Risk-Weighted Assets), For minimum capital adequacy purposes, Amount $ 301,150 $ 279,063
Tier I Capital (to Risk-Weighted Assets), For minimum capital adequacy purposes, Ratio 0.06 0.06
Tier I Capital (to Risk-Weighted Assets), To be well capitalized under prompt corrective action provisions, Amount $ 401,533 $ 372,083
Tier I Capital (to Risk-Weighted Assets), To be well capitalized under prompt corrective action provisions, Ratio 0.08 0.08
Common Equity Tier I Capital (to Risk-Weighted Assets)    
Common Equity Tier I Capital (to Risk-Weighted Assets), Actual Amount $ 653,844 $ 614,156
Common Equity Tier I Capital (to Risk-Weighted Assets), Actual Ratio 0.13 0.132
Common Equity Tier I Capital (to Risk-Weighted Assets), For minimum capital adequacy purposes, Amount $ 225,862 $ 209,297
Common Equity Tier I Capital (to Risk-Weighted Assets), For minimum capital adequacy purposes, Ratio 0.045 0.045
Common Equity Tier I Capital (to Risk-Weighted Assets), To be well capitalized under prompt corrective action provisions, Amount $ 326,246 $ 302,318
Common Equity Tier I Capital (to Risk-Weighted Assets), To be well capitalized under prompt corrective action provisions, Ratio 0.065 0.065
Tier I Capital (to Total Average Assets)    
Tier I Capital (to Total Average Assets), Actual Amount $ 653,844 $ 614,156
Tier I Capital (to Total Average Assets), Actual Ratio 0.126 0.125
Tier I Capital (to Total Average Assets), For minimum capital adequacy purposes, Amount $ 207,685 $ 196,435
Tier I Capital (to Total Average Assets), For minimum capital adequacy purposes, Ratio 0.04 0.04
Tier I Capital (to Total Average Assets), To be well capitalized under prompt corrective action provisions, Amount $ 259,606 $ 245,544
Tier I Capital (to Total Average Assets), To be well capitalized under prompt corrective action provisions, Ratio 0.05 0.05