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Regulatory Capital - Capital Ratio Requirements under Prompt Corrective Action or Other Regulatory Requirements (Details)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2025
USD ($)
Dec. 31, 2024
USD ($)
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Capital conservation buffer 2.50% 2.50%
Consolidated    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Leverage Ratio 11.5 10.7
Common equity risk-based ratio 14.7 13.2
Risk-based capital Ratio 14.7 13.2
Total risk-based capital Ratio 16.6 15.1
Leverage Amount $ 1,095,345 $ 1,037,550
Common equity risk-based amount 1,095,345 1,037,550
Risk-based capital amount 1,095,345 1,037,550
Total risk-based capital Amount $ 1,239,582 $ 1,187,514
Required to be considered adequately capitalized Ratio, leverage ratio 4 4
Required to be considered adequately capitalized Ratio, risk-based common equity capital ratio 7 7
Required to be considered adequately capitalized Ratio, risk-based capital ratio 8.5 8.5
Required to be considered adequately capitalized Ratio, Total risk-based capital ratio 10.5 10.5
Required to be considered adequately capitalized leverage Amount $ 381,378 $ 388,278
Required to be considered adequately capitalized common equity capital amount 521,824 550,074
Required to be considered adequately capitalized risk-based capital Amount 633,643 667,947
Required to be considered adequately capitalized Total risk-based capital Amount $ 782,736 $ 825,111
NBH Bank    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Leverage Ratio 10.5 9.5
Common equity risk-based ratio 13.5 11.8
Risk-based capital Ratio 13.5 11.8
Total risk-based capital Ratio 14.7 13
Leverage Amount $ 1,000,996 $ 921,509
Common equity risk-based amount 1,000,996 921,509
Risk-based capital amount 1,000,996 921,509
Total risk-based capital Amount $ 1,090,204 $ 1,016,471
Required to be considered well capitalized Ratio, leverage ratio 5 5
Required to be considered well capitalized Ratio, risk-based common equity capital ratio 6.5 6.5
Required to be considered well capitalized Ratio, risk-based capital ratio 8 8
Required to be considered well capitalized Ratio, Total risk-based capital ratio 10 10
Required to be considered well capitalized leverage Amount $ 474,795 $ 483,533
Required to be considered well capitalized common equity capital amount 481,436 508,418
Required to be considered well capitalized risk-based capital Amount 592,536 625,746
Required to be considered well capitalized Total risk-based capital Amount $ 740,670 $ 782,182
Required to be considered adequately capitalized Ratio, leverage ratio 4 4
Required to be considered adequately capitalized Ratio, risk-based common equity capital ratio 7 7
Required to be considered adequately capitalized Ratio, risk-based capital ratio 8.5 8.5
Required to be considered adequately capitalized Ratio, Total risk-based capital ratio 10.5 10.5
Required to be considered adequately capitalized leverage Amount $ 379,836 $ 386,826
Required to be considered adequately capitalized common equity capital amount 518,469 547,528
Required to be considered adequately capitalized risk-based capital Amount 629,570 664,855
Required to be considered adequately capitalized Total risk-based capital Amount $ 777,704 $ 821,291
Bank of Jackson Hole    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Leverage Ratio 33.9 31
Common equity risk-based ratio 76.8 77.2
Risk-based capital Ratio 76.8 77.2
Total risk-based capital Ratio 76.9 77.3
Leverage Amount $ 13,070 $ 12,461
Common equity risk-based amount 13,070 12,461
Risk-based capital amount 13,070 12,461
Total risk-based capital Amount $ 13,099 $ 12,462
Required to be considered well capitalized Ratio, leverage ratio 5 5
Required to be considered well capitalized Ratio, risk-based common equity capital ratio 6.5 6.5
Required to be considered well capitalized Ratio, risk-based capital ratio 8 8
Required to be considered well capitalized Ratio, Total risk-based capital ratio 10 10
Required to be considered well capitalized leverage Amount $ 1,928 $ 2,013
Required to be considered well capitalized common equity capital amount 1,107 1,049
Required to be considered well capitalized risk-based capital Amount 1,362 1,291
Required to be considered well capitalized Total risk-based capital Amount $ 1,703 $ 1,613
Required to be considered adequately capitalized Ratio, leverage ratio 4 4
Required to be considered adequately capitalized Ratio, risk-based common equity capital ratio 7 7
Required to be considered adequately capitalized Ratio, risk-based capital ratio 8.5 8.5
Required to be considered adequately capitalized Ratio, Total risk-based capital ratio 10.5 10.5
Required to be considered adequately capitalized leverage Amount $ 1,542 $ 1,611
Required to be considered adequately capitalized common equity capital amount 1,192 1,129
Required to be considered adequately capitalized risk-based capital Amount 1,447 1,371
Required to be considered adequately capitalized Total risk-based capital Amount $ 1,788 $ 1,694