Regulatory Capital - Capital Ratio Requirements under Prompt Corrective Action or Other Regulatory Requirements (Details) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
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	0.102	0.097
Common equity risk-based ratio	0.124	0.119
Risk-based capital Ratio	0.124	0.119
Total risk-based capital Ratio	0.143	0.138
Leverage Amount	$ 984,662	$ 941,369
Common equity risk-based amount	984,662	941,369
Risk-based capital amount	984,662	941,369
Total risk-based capital Amount	$ 1,136,361	$ 1,092,800
Required to be considered adequately capitalized Ratio, leverage ratio	0.040	0.040
Required to be considered well capitalized Ratio, risk-based capital ratio		0.070
Required to be considered adequately capitalized Ratio, risk-based capital ratio	0.070
Required to be considered adequately capitalized Ratio, risk-based capital ratio	0.085	0.085
Required to be considered adequately capitalized Ratio, Total risk-based capital ratio	0.105	0.105
Required to be considered adequately capitalized leverage Amount	$ 386,310	$ 386,775
Required to be considered adequately capitalized common equity capital amount	555,632	554,325
Required to be considered adequately capitalized risk-based capital Amount	674,696	673,109
Required to be considered adequately capitalized Total risk-based capital Amount	$ 833,448	$ 831,487
NBH Bank
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Leverage Ratio	0.091	0.089
Common equity risk-based ratio	0.111	0.109
Risk-based capital Ratio	0.111	0.109
Total risk-based capital Ratio	0.123	0.121
Leverage Amount	$ 875,042	$ 856,243
Common equity risk-based amount	875,042	856,243
Risk-based capital amount	875,042	856,243
Total risk-based capital Amount	$ 971,739	$ 952,674
Required to be considered well capitalized Ratio, leverage ratio	0.050	0.050
Required to be considered well capitalized Ratio, risk-based common equity capital ratio	0.065	0.065
Required to be considered well capitalized Ratio, risk-based capital ratio	0.080	0.080
Required to be considered well capitalized Ratio, Total risk-based capital ratio	0.100	0.100
Required to be considered well capitalized leverage Amount	$ 480,981	$ 481,685
Required to be considered well capitalized common equity capital amount	513,627	512,408
Required to be considered well capitalized risk-based capital Amount	632,156	630,656
Required to be considered well capitalized Total risk-based capital Amount	$ 790,196	$ 788,319
Required to be considered adequately capitalized Ratio, leverage ratio	0.040	0.040
Required to be considered well capitalized Ratio, risk-based capital ratio		0.070
Required to be considered adequately capitalized Ratio, risk-based capital ratio	0.070
Required to be considered adequately capitalized Ratio, risk-based capital ratio	0.085	0.085
Required to be considered adequately capitalized Ratio, Total risk-based capital ratio	0.105	0.105
Required to be considered adequately capitalized leverage Amount	$ 384,785	$ 385,348
Required to be considered adequately capitalized common equity capital amount	553,137	551,824
Required to be considered adequately capitalized risk-based capital Amount	671,666	670,072
Required to be considered adequately capitalized Total risk-based capital Amount	$ 829,705	$ 827,735
Bank of Jackson Hole
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]
Leverage Ratio	0.305	0.300
Common equity risk-based ratio	0.729	0.712
Risk-based capital Ratio	0.729	0.712
Total risk-based capital Ratio	0.729	0.712
Leverage Amount	$ 12,155	$ 11,609
Common equity risk-based amount	12,155	11,609
Risk-based capital amount	12,155	11,609
Total risk-based capital Amount	$ 12,156	$ 11,609
Required to be considered well capitalized Ratio, leverage ratio	0.050	0.050
Required to be considered well capitalized Ratio, risk-based common equity capital ratio	0.065	0.065
Required to be considered well capitalized Ratio, risk-based capital ratio	0.080	0.080
Required to be considered well capitalized Ratio, Total risk-based capital ratio	0.100	0.100
Required to be considered well capitalized leverage Amount	$ 1,994	$ 1,936
Required to be considered well capitalized common equity capital amount	1,085	1,059
Required to be considered well capitalized risk-based capital Amount	1,335	1,304
Required to be considered well capitalized Total risk-based capital Amount	$ 1,668	$ 1,629
Required to be considered adequately capitalized Ratio, leverage ratio	0.040	0.040
Required to be considered well capitalized Ratio, risk-based capital ratio		0.070
Required to be considered adequately capitalized Ratio, risk-based capital ratio	0.070
Required to be considered adequately capitalized Ratio, risk-based capital ratio	0.085	0.085
Required to be considered adequately capitalized Ratio, Total risk-based capital ratio	0.105	0.105
Required to be considered adequately capitalized leverage Amount	$ 1,595	$ 1,549
Required to be considered adequately capitalized common equity capital amount	1,168	1,141
Required to be considered adequately capitalized risk-based capital Amount	1,418	1,385
Required to be considered adequately capitalized Total risk-based capital Amount	$ 1,752	$ 1,711