v3.26.1
Regulatory Capital Matters - Schedule of Actual and required capital amounts (Details)
$ in Thousands
Mar. 31, 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 $ 1,210,539 $ 1,187,736
Total risk-based capital to risk-weighted assets, Actual Ratio 0.1529 0.1573
Total risk-based capital to risk-weighted assets, For Capital Adequacy Purposes, Amount $ 633,193 $ 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 $ 1,089,871 $ 1,065,783
Tier 1 risk-based capital to risk-weighted assets, Actual Ratio 0.1377 0.1412
Tier 1 risk-based capital to risk-weighted assets, For Capital Adequacy Purposes, Amount $ 474,895 $ 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 $ 1,089,871 $ 1,065,783
Common Equity Tier 1 (CET 1) to risk-weighted assets, Actual Ratio 0.1377 0.1412
Common Equity Tier 1 (CET 1) to risk-weighted assets, For Capital Adequacy Purposes, Amount $ 356,171 $ 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 $ 1,089,871 $ 1,065,783
Tier 1 leverage capital to average assets, Actual Ratio 0.1306 0.1275
Tier 1 leverage capital to average assets, For Capital Adequacy Purposes, Amount $ 333,819 $ 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 $ 1,144,278 $ 1,119,717
Total risk-based capital to risk-weighted assets, Actual Ratio 0.1448 0.1485
Total risk-based capital to risk-weighted assets, For Capital Adequacy Purposes, Amount $ 632,247 $ 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 $ 790,309 $ 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 $ 1,060,364 $ 1,034,444
Tier 1 risk-based capital to risk-weighted assets, Actual Ratio 0.1342 0.1372
Tier 1 risk-based capital to risk-weighted assets, For Capital Adequacy Purposes, Amount $ 474,185 $ 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 $ 632,247 $ 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 $ 1,060,364 $ 1,034,444
Common Equity Tier 1 (CET 1) to risk-weighted assets, Actual Ratio 0.1342 0.1372
Common Equity Tier 1 (CET 1) to risk-weighted assets, For Capital Adequacy Purposes, Amount $ 355,639 $ 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 $ 513,701 $ 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 $ 1,060,364 $ 1,034,444
Tier 1 leverage capital to average assets, Actual Ratio 0.1270 0.1238
Tier 1 leverage capital to average assets, For Capital Adequacy Purposes, Amount $ 333,887 $ 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 $ 417,358 $ 417,862
Tier 1 leverage capital to average assets, To be Well-Capitalized under Prompt Corrective Action Provisions, Ratio 0.0500 0.0500