v3.26.1
Regulatory Matters - Schedule of Capital Amounts and Ratios for Bank (Details)
$ in Thousands
Jun. 30, 2026
USD ($)
Dec. 31, 2025
USD ($)
Actual Capital, Amount    
Common Equity Tier 1 Capital to Risk-Weighted Assets, Actual Capital, Amount $ 351,649 $ 344,979
Common Equity Tier 1 Capital to Risk-Weighted Assets, Minimum Regulatory Capital Required for Capital Adequacy plus Capital Conservation Buffer 210,982 203,425
Common Equity Tier 1 Capital to Risk-Weighted Assets, Minimum Regulatory Capital to be Well Capitalized Under Prompt Corrective Action Provisions 195,912 188,895
Tier One Risk Based Capital, Amount    
Tier I Capital to Risk-Weighted Assets, Actual Capital, Amount 351,649 344,979
Tier I Capital to Risk-Weighted Assets, Minimum Regulatory Capital to be Well Capitalized Under Prompt Corrective Action Provisions 256,193 247,017
Tier I Capital to Risk-Weighted Assets, Minimum Regulatory Capital to be Well Capitalized Under Prompt Corrective Action Provisions, with Buffer 241,123 232,486
Capital, Amount    
Total Capital to Risk-Weighted Assets, Actual Capital, Amount 382,874 376,171
Total Capital to Risk-Weighted Assets, Minimum Regulatory Capital Required for Capital Adequacy plus Capital Conservation Buffer 316,473 305,138
Total Capital to Risk-Weighted Assets, Minimum Regulatory Capital to be Well Capitalized Under Prompt Corrective Action Provisions 301,403 290,608
Tier One Leverage Capital, Amount    
Tier I Capital to Average Assets, Actual Capital, Amount 351,649 344,979
Tier I Capital to Average Assets, Minimum Regulatory Capital Required for Capital Adequacy plus Capital Conservation Buffer 135,429 130,725
Tier I Capital to Average Assets, Minimum Regulatory Capital to be Well Capitalized Under Prompt Corrective Action Provisions $ 169,286 $ 163,406
Actual Capital, Ratio    
Common Equity Tier One Capital Ratio 0.1167 0.1187
Common Equity Tier 1 requirement (as a percent) 0.070 0.0700
Common Equity Tier 1 Capital to Risk-Weighted Assets, Minimum Regulatory Capital to be Well Capitalized Under Prompt Corrective Action Provisions 0.0650 0.0650
Tier I Capital to Risk-Weighted Assets, Actual Capital, Ratio 0.1167 0.1187
Tier I Capital to Risk-Weighted Assets, Minimum Regulatory Capital Required for Capital Adequacy plus Capital Conservation Buffer 0.0850 0.0850
Tier I Capital to Risk-Weighted Assets, Minimum Regulatory Capital to be Well Capitalized Under Prompt Corrective Action Provisions with Buffer 8.00% 8.00%
Total Capital to Risk-Weighted Assets, Actual Capital, Ratio 0.1270 0.1294
Total Capital to Risk-Weighted Assets, Minimum Regulatory Capital Required for Capital Adequacy plus Capital Conservation Buffer 0.105 0.1050
Total Capital to Risk-Weighted Assets, Minimum Regulatory Capital to be Well Capitalized Under Prompt Corrective Action Provisions 0.1000 0.1000
Tier I Capital to Average Assets, Actual Capital, Ratio 0.1039 0.1056
Tier I Capital to Average Assets, Minimum Regulatory Capital Required for Capital Adequacy plus Capital Conservation Buffer 0.0400 0.0400
Tier I Capital to Average Assets, Minimum Regulatory Capital to be Well Capitalized Under Prompt Corrective Action Provisions 0.0500 0.0500
Bankwell Financial Group Inc    
Actual Capital, Amount    
Common Equity Tier 1 Capital to Risk-Weighted Assets, Actual Capital, Amount $ 319,886 $ 298,121
Common Equity Tier 1 Capital to Risk-Weighted Assets, Minimum Regulatory Capital Required for Capital Adequacy plus Capital Conservation Buffer 136,047 131,112
Common Equity Tier 1 Capital to Risk-Weighted Assets, Minimum Regulatory Capital to be Well Capitalized Under Prompt Corrective Action Provisions 196,513 189,385
Tier One Risk Based Capital, Amount    
Tier I Capital to Risk-Weighted Assets, Actual Capital, Amount 319,886 298,121
Tier I Capital to Risk-Weighted Assets, Minimum Regulatory Capital to be Well Capitalized Under Prompt Corrective Action Provisions 181,397 174,816
Tier I Capital to Risk-Weighted Assets, Minimum Regulatory Capital Required for Capital Adequacy plus Capital Conservation Buffer 241,862 233,089
Capital, Amount    
Total Capital to Risk-Weighted Assets, Actual Capital, Amount 420,931 399,010
Total Capital to Risk-Weighted Assets, Minimum Regulatory Capital Required for Capital Adequacy plus Capital Conservation Buffer 241,862 233,089
Total Capital to Risk-Weighted Assets, Minimum Regulatory Capital to be Well Capitalized Under Prompt Corrective Action Provisions 302,328 291,361
Tier One Leverage Capital, Amount    
Tier I Capital to Average Assets, Actual Capital, Amount 319,886 298,121
Tier I Capital to Average Assets, Minimum Regulatory Capital Required for Capital Adequacy plus Capital Conservation Buffer 135,926 130,961
Tier I Capital to Average Assets, Minimum Regulatory Capital to be Well Capitalized Under Prompt Corrective Action Provisions $ 169,908 $ 163,701
Actual Capital, Ratio    
Common Equity Tier One Capital Ratio 0.1058 0.1023
Common Equity Tier 1 requirement (as a percent) 0.0450 0.0450
Common Equity Tier 1 Capital to Risk-Weighted Assets, Minimum Regulatory Capital to be Well Capitalized Under Prompt Corrective Action Provisions 0.0650 0.0650
Tier I Capital to Risk-Weighted Assets, Actual Capital, Ratio 0.1058 0.1023
Tier I Capital to Risk-Weighted Assets, Minimum Regulatory Capital Required for Capital Adequacy plus Capital Conservation Buffer 0.0600 0.0600
Tier I Capital to Risk-Weighted Assets, Minimum Regulatory Capital to be Well Capitalized Under Prompt Corrective Action Provisions 0.0800 0.0800
Total Capital to Risk-Weighted Assets, Actual Capital, Ratio 0.1392 0.1369
Total Capital to Risk-Weighted Assets, Minimum Regulatory Capital Required for Capital Adequacy plus Capital Conservation Buffer 0.0800 0.0800
Total Capital to Risk-Weighted Assets, Minimum Regulatory Capital to be Well Capitalized Under Prompt Corrective Action Provisions 0.1000 0.1000
Tier I Capital to Average Assets, Actual Capital, Ratio 0.0941 0.0911
Tier I Capital to Average Assets, Minimum Regulatory Capital Required for Capital Adequacy plus Capital Conservation Buffer 0.0400 0.0400
Tier I Capital to Average Assets, Minimum Regulatory Capital to be Well Capitalized Under Prompt Corrective Action Provisions 0.0500 0.0500