v3.26.1
Regulatory Capital - Summary of Company's and Wilson Banks Actual Capital Amounts and Ratios (Details)
$ in Thousands
Mar. 31, 2026
USD ($)
Dec. 31, 2025
USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total capital to risk weighted assets actual amount $ 703,578 $ 685,448
Total capital to risk weighted assets actual ratio 0.158 0.156
Total capital to risk weighted assets regulatory minimum capital requirement amount $ 357,192 $ 350,970
Total capital to risk weighted assets regulatory minimum capital requirement ratio 0.08 0.08
Total capital to risk weighted assets well capitalized amount [1],[2] $ 446,489 $ 438,712
Total capital to risk weighted assets regulatory minimum capital requirement well capitalized ratio [1],[2] 0.10 0.10
Tier 1 capital to risk weighted assets actual amount $ 647,718 $ 630,578
Tier 1 capital to risk weighted assets actual ratio 0.145 0.144
Tier 1 capital to risk weighted assets regulatory minimum capital requirement amount $ 267,894 $ 263,227
Tier 1 capital to risk weighted assets regulatory minimum capital requirement ratio 0.06 0.06
Tier 1 capital to risk well capitalized amount [1],[2] $ 267,894 $ 263,227
Tier 1 capital to risk weighted assets regulatory well capitalized ratio [1],[2] 0.06 0.06
Common equity Tier 1 capital to risk weighted assets actual amount $ 647,718 $ 630,578
Common equity Tier 1 capital to risk weighted assets actual ratio 0.145 0.144
Common equity Tier 1 capital to risk weighted assets regulatory minimum capital requirement amount $ 200,920 $ 197,420
Common equity Tier 1 capital to risk weighted assets regulatory minimum capital requirement ratio 0.045 0.045
Tier 1 capital to average assets actual amount $ 647,718 $ 630,578
Tier 1 capital to average assets actual ratio 0.109 0.106
Tier 1 capital to average assets regulatory minimum capital requirement amount $ 238,493 $ 237,557
Tier 1 capital to average assets regulatory minimum capital requirement ratio (as a percent) 0.04 0.04
Wilson Bank [Member]    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total capital to risk weighted assets actual amount $ 693,666 $ 682,240
Total capital to risk weighted assets actual ratio 0.155 0.156
Total capital to risk weighted assets regulatory minimum capital requirement amount $ 357,063 $ 350,834
Total capital to risk weighted assets regulatory minimum capital requirement ratio 0.08 0.08
Total capital to risk weighted assets well capitalized amount [1],[2] $ 446,329 $ 438,542
Total capital to risk weighted assets regulatory minimum capital requirement well capitalized ratio [1],[2] 0.10 0.10
Tier 1 capital to risk weighted assets actual amount $ 637,826 $ 627,391
Tier 1 capital to risk weighted assets actual ratio 0.143 0.143
Tier 1 capital to risk weighted assets regulatory minimum capital requirement amount $ 267,797 $ 263,125
Tier 1 capital to risk weighted assets regulatory minimum capital requirement ratio 0.06 0.06
Tier 1 capital to risk well capitalized amount [1],[2] $ 357,063 $ 350,833
Tier 1 capital to risk weighted assets regulatory well capitalized ratio [1],[2] 0.08 0.08
Common equity Tier 1 capital to risk weighted assets actual amount $ 637,826 $ 627,391
Common equity Tier 1 capital to risk weighted assets actual ratio 0.143 0.143
Common equity Tier 1 capital to risk weighted assets regulatory minimum capital requirement amount $ 200,848 $ 197,344
Common equity Tier 1 capital to risk weighted assets regulatory minimum capital requirement ratio 0.045 0.045
Common equity Tier 1 capital to risk weighted assets regulatory well capitalized [1],[2] $ 290,114 $ 285,052
Common equity Tier 1 capital to risk weighted assets well capitalized ratio [1],[2] 0.065 0.065
Tier 1 capital to average assets actual amount $ 637,826 $ 627,391
Tier 1 capital to average assets actual ratio 0.107 0.106
Tier 1 capital to average assets regulatory minimum capital requirement amount $ 238,402 $ 237,470
Tier 1 capital to average assets regulatory minimum capital requirement ratio (as a percent) 0.04 0.04
Tier 1 capital to average assets well capitalized [1],[2] $ 298,002 $ 296,838
Tier 1 capital to average assets well capitalized ratio [1],[2] 0.05 0.05
[1] Ratios for Wilson Bank are those under applicable FDIC regulations for prompt corrective action.
[2] Well-capitalized minimum Common equity Tier 1 capital to risk weighted assets and Tier 1 capital to average assets are not formally defined under applicable regulations for bank holding companies.