v3.26.1
Regulatory Capital Matters - Schedule of Actual and required capital amounts (Details)
$ in Thousands
Jun. 30, 2026
USD ($)
Dec. 31, 2025
USD ($)
Parent Company    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total risk-based capital to risk-weighted assets, Actual Amount $ 1,874,943 $ 1,187,736
Total risk-based capital to risk-weighted assets, Actual Ratio 0.1413 0.1573
Total risk-based capital to risk-weighted assets, For Capital Adequacy Purposes, Amount $ 1,061,823 $ 604,008
Total risk-based capital to risk-weighted assets, For Capital Adequacy Purposes, Ratio 0.0800 0.0800
Tier 1 risk-based capital to risk-weighted assets, Actual Amount $ 1,585,664 $ 1,065,783
Tier 1 risk-based capital to risk-weighted assets, Actual Ratio 0.1195 0.1412
Tier 1 risk-based capital to risk-weighted assets, For Capital Adequacy Purposes, Amount $ 796,367 $ 453,006
Tier 1 risk-based capital to risk-weighted assets, For Capital Adequacy Purposes, Ratio 0.0600 0.0600
Common Equity Tier 1 (CET 1) to risk-weighted assets, Actual Amount $ 1,585,664 $ 1,065,783
Common Equity Tier 1 (CET 1) to risk-weighted assets, Actual Ratio 0.1195 0.1412
Common Equity Tier 1 (CET 1) to risk-weighted assets, For Capital Adequacy Purposes, Amount $ 597,275 $ 339,755
Common Equity Tier 1 (CET 1) to risk-weighted assets, For Capital Adequacy Purposes, Ratio 0.0450 0.0450
Tier 1 leverage capital to average assets, Actual Amount $ 1,585,664 $ 1,065,783
Tier 1 leverage capital to average assets, Actual Ratio 0.0947 0.1275
Tier 1 leverage capital to average assets, For Capital Adequacy Purposes, Amount $ 669,976 $ 334,328
Tier 1 leverage capital to average assets, For Capital Adequacy Purposes, Ratio 0.0400 0.0400
Dividends from Sunflower Wealth Advisors, LLC    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Total risk-based capital to risk-weighted assets, Actual Amount $ 1,813,097 $ 1,119,717
Total risk-based capital to risk-weighted assets, Actual Ratio 0.1369 0.1485
Total risk-based capital to risk-weighted assets, For Capital Adequacy Purposes, Amount $ 1,059,496 $ 603,066
Total risk-based capital to risk-weighted assets, For Capital Adequacy Purposes, Ratio 0.0800 0.0800
Total risk-based capital to risk-weighted assets, To be Well-Capitalized under Prompt Corrective Action Provisions, Amount $ 1,324,370 $ 753,832
Total risk-based capital to risk-weighted assets, To be Well-Capitalized under Prompt Corrective Action Provisions, Ratio 0.1000 0.1000
Tier 1 risk-based capital to risk-weighted assets, Actual Amount $ 1,718,413 $ 1,034,444
Tier 1 risk-based capital to risk-weighted assets, Actual Ratio 0.1298 0.1372
Tier 1 risk-based capital to risk-weighted assets, For Capital Adequacy Purposes, Amount $ 794,622 $ 452,299
Tier 1 risk-based capital to risk-weighted assets, For Capital Adequacy Purposes, Ratio 0.0600 0.0600
Tier 1 risk-based capital to risk-weighted assets, To be Well-Capitalized under Prompt Corrective Action Provisions, Amount $ 1,059,496 $ 603,066
Tier 1 risk-based capital to risk-weighted assets, To be Well-Capitalized under Prompt Corrective Action Provisions, Ratio 0.0800 0.0800
Common Equity Tier 1 (CET 1) to risk-weighted assets, Actual Amount $ 1,718,413 $ 1,034,444
Common Equity Tier 1 (CET 1) to risk-weighted assets, Actual Ratio 0.1298 0.1372
Common Equity Tier 1 (CET 1) to risk-weighted assets, For Capital Adequacy Purposes, Amount $ 595,966 $ 339,225
Common Equity Tier 1 (CET 1) to risk-weighted assets, For Capital Adequacy Purposes, Ratio 0.0450 0.0450
Common Equity Tier 1 (CET 1) to risk-weighted assets, To be Well-Capitalized under Prompt Corrective Action Provisions, Amount $ 860,840 $ 489,991
Common Equity Tier 1 (CET 1) to risk-weighted assets, To be Well-Capitalized under Prompt Corrective Action Provisions, Ratio 0.0650 0.0650
Tier 1 leverage capital to average assets, Actual Amount $ 1,718,413 $ 1,034,444
Tier 1 leverage capital to average assets, Actual Ratio 0.1027 0.1238
Tier 1 leverage capital to average assets, For Capital Adequacy Purposes, Amount $ 669,040 $ 334,290
Tier 1 leverage capital to average assets, For Capital Adequacy Purposes, Ratio 0.0400 0.0400
Tier 1 leverage capital to average assets, To be Well-Capitalized under Prompt Corrective Action Provisions, Amount $ 836,300 $ 417,862
Tier 1 leverage capital to average assets, To be Well-Capitalized under Prompt Corrective Action Provisions, Ratio 0.0500 0.0500