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Regulatory Capital Requirements (Tables) | 12 Months Ended
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Dec. 31, 2025
Broker-Dealer, Net Capital Requirement, SEC Regulation [Abstract] |
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block] | as of December 31, 2025 and 2024.
|  | Actual |  | For Capital Adequacy Purposes |  | For Capital Adequacy Purposes With Capital Conservation Buffer |  | To Be Well-Capitalized
|  | Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio |  | Amount |  | Ratio
As of December 31, 2025: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Capital (to Risk-Weighted Assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 446,560 |  |  | 12.77 | % |  | $ | 279,756 |  |  | 8.00 | % |  | $ | 367,180 |  |  | 10.50 | % |  | $ | 349,695 |  |  | 10.00 | %
West Bank |  | 466,888 |  |  | 13.35 | % |  | 279,703 |  |  | 8.00 | % |  | 367,110 |  |  | 10.50 | % |  | 349,629 |  |  | 10.00 | %
Tier 1 Capital (to Risk-Weighted Assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | 354,490 |  |  | 10.14 | % |  | 209,817 |  |  | 6.00 | % |  | 297,241 |  |  | 8.50 | % |  | 279,756 |  |  | 8.00 | %
West Bank |  | 434,818 |  |  | 12.44 | % |  | 209,777 |  |  | 6.00 | % |  | 297,184 |  |  | 8.50 | % |  | 279,703 |  |  | 8.00 | %
Common Equity Tier 1 Capital (to Risk-Weighted Assets) |  |  |  |  |  |  |  |  |  |
Consolidated |  | 334,490 |  |  | 9.57 | % |  | 157,363 |  |  | 4.50 | % |  | 244,786 |  |  | 7.00 | % |  | 227,302 |  |  | 6.50 | %
West Bank |  | 434,818 |  |  | 12.44 | % |  | 157,333 |  |  | 4.50 | % |  | 244,740 |  |  | 7.00 | % |  | 227,259 |  |  | 6.50 | %
Tier 1 Capital (to Average Assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | 354,490 |  |  | 8.44 | % |  | 168,074 |  |  | 4.00 | % |  | 168,074 |  |  | 4.00 | % |  | 210,092 |  |  | 5.00 | %
West Bank |  | 434,818 |  |  | 10.35 | % |  | 168,053 |  |  | 4.00 | % |  | 168,053 |  |  | 4.00 | % |  | 210,067 |  |  | 5.00 | %
As of December 31, 2024: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total Capital (to Risk-Weighted Assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | $ | 429,208 |  |  | 12.11 | % |  | $ | 283,628 |  |  | 8.00 | % |  | $ | 372,261 |  |  | 10.50 | % |  | $ | 354,535 |  |  | 10.00 | %
West Bank |  | 455,572 |  |  | 12.86 | % |  | 283,468 |  |  | 8.00 | % |  | 372,051 |  |  | 10.50 | % |  | 354,335 |  |  | 10.00 | %
Tier 1 Capital (to Risk-Weighted Assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | 337,232 |  |  | 9.51 | % |  | 212,721 |  |  | 6.00 | % |  | 301,354 |  |  | 8.50 | % |  | 283,628 |  |  | 8.00 | %
West Bank |  | 423,596 |  |  | 11.95 | % |  | 212,601 |  |  | 6.00 | % |  | 301,184 |  |  | 8.50 | % |  | 283,468 |  |  | 8.00 | %
Common Equity Tier 1 Capital (to Risk-Weighted Assets) |  |  |  |  |  |  |  |  |  |
Consolidated |  | 317,232 |  |  | 8.95 | % |  | 159,541 |  |  | 4.50 | % |  | 248,174 |  |  | 7.00 | % |  | 230,447 |  |  | 6.50 | %
West Bank |  | 423,596 |  |  | 11.95 | % |  | 159,451 |  |  | 4.50 | % |  | 248,034 |  |  | 7.00 | % |  | 230,317 |  |  | 6.50 | %
Tier 1 Capital (to Average Assets) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Consolidated |  | 337,232 |  |  | 7.93 | % |  | 170,113 |  |  | 4.00 | % |  | 170,113 |  |  | 4.00 | % |  | 212,641 |  |  | 5.00 | %
West Bank |  | 423,596 |  |  | 9.97 | % |  | 170,029 |  |  | 4.00 | % |  | 170,029 |  |  | 4.00 | % |  | 212,537 |  |  | 5.00 | %

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- Definition Tabular disclosure of the capital amounts and ratios as of the balance sheet date, indicating whether the entity or entities are in compliance with regulatory capital requirements, by entity. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1B -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1B + Details
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