v3.26.1
Regulatory Capital - First Bank’s Actual and Required Capital Amounts and Ratios (Details) - USD ($)
$ in Thousands
Dec. 31, 2025
Dec. 31, 2024
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Capital conservation buffer, capital conserved, minimum (in percent) 0.0250 0.0250
Total capital (to risk-weighted assets)    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Actual Amount $ 186,532 $ 181,415
Actual Ratio (in percent) 14.60% 14.20%
Minimum for Capital Adequacy Purposes Amount $ 101,960 $ 102,014
Minimum for Capital Adequacy Purposes Ratio (in percent) 0.080 0.080
Minimum to be Categorized as "Well-Capitalized" Under Prompt Corrective Action Provisions Amount $ 127,451 $ 127,518
Minimum to be Categorized as "Well-Capitalized" Under Prompt Corrective Action Provisions Ratio (in percent) 0.100 0.100
Tier I capital (to risk-weighted assets)    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Actual Amount $ 170,591 $ 165,471
Actual Ratio (in percent) 13.40% 13.00%
Minimum for Capital Adequacy Purposes Amount $ 76,470 $ 76,511
Minimum for Capital Adequacy Purposes Ratio (in percent) 0.060 0.060
Minimum to be Categorized as "Well-Capitalized" Under Prompt Corrective Action Provisions Amount $ 101,960 $ 102,014
Minimum to be Categorized as "Well-Capitalized" Under Prompt Corrective Action Provisions Ratio (in percent) 0.080 0.080
Common Equity Tier I capital (to risk-weighted assets)    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Actual Amount $ 170,591 $ 165,471
Actual Ratio (in percent) 13.40% 13.00%
Minimum for Capital Adequacy Purposes Amount $ 57,353 $ 57,383
Minimum for Capital Adequacy Purposes Ratio (in percent) 0.045 0.045
Minimum to be Categorized as "Well-Capitalized" Under Prompt Corrective Action Provisions Amount $ 82,843 $ 82,887
Minimum to be Categorized as "Well-Capitalized" Under Prompt Corrective Action Provisions Ratio (in percent) 0.065 0.065
Tier I leverage capital (to average assets)    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Actual Amount $ 170,591 $ 165,471
Actual Ratio (in percent) 11.00% 10.70%
Minimum for Capital Adequacy Purposes Amount $ 62,290 $ 61,579
Minimum for Capital Adequacy Purposes Ratio (in percent) 0.040 0.040
Minimum to be Categorized as "Well-Capitalized" Under Prompt Corrective Action Provisions Amount $ 77,862 $ 76,974
Minimum to be Categorized as "Well-Capitalized" Under Prompt Corrective Action Provisions Ratio (in percent) 0.050 0.050