Loans and Allowance for Credit Losses - Collateral dependent loans and related ACL (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025	Jun. 30, 2025	Mar. 31, 2025	Dec. 31, 2024	Jun. 30, 2024
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	$ 4,322,360		$ 4,100,768
Related allowance for credit losses	55,937	$ 54,465	51,629	$ 54,940	$ 54,740	$ 52,516
Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	546,002		510,259
Related allowance for credit losses	8,293	8,804	6,952	7,572	8,063	6,233
Agriculture production
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	204,447		206,128
Related allowance for credit losses	3,826	2,379	3,374	1,191	1,060	835
Consumer
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	51,869		55,387
Related allowance for credit losses	1,056	1,343	952	1,096	603	578
All other loans
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	8,348		5,102
Related allowance for credit losses	4	$ 3	4	$ 17	$ 24	$ 17
Real Estate
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	44,835		41,259
Real Estate \| 1-4 Family residential real estate
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	2,114		752
Real Estate \| Commercial Real Estate \| Non-owner occupied
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	30,414		31,764
Real Estate \| Commercial Real Estate \| Owner occupied
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	3,414		811
Real Estate \| Construction and land development
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	5,743		5,743
Real Estate \| Agriculture real estate
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	3,150		1,695
Real Estate \| Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Loans Receivable			494
Land
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	545		661
Land \| Construction and land development
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	545		661
Other
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	9,085		3,669
Other \| Commercial Real Estate \| Non-owner occupied
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	23
Other \| Commercial Real Estate \| Owner occupied
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	468		541
Other \| Agriculture real estate
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	36
Other \| Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	6,366		3,128
Other \| Agriculture production
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	2,192
Collateral Pledged
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	54,465		45,589
Related allowance for credit losses	8,725		8,153
Collateral Pledged \| 1-4 Family residential real estate
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	2,114		752
Related allowance for credit losses	84		117
Collateral Pledged \| Commercial Real Estate \| Non-owner occupied
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	30,437		31,764
Related allowance for credit losses	5,079		6,456
Collateral Pledged \| Commercial Real Estate \| Owner occupied
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	3,882		1,352
Related allowance for credit losses	448		290
Collateral Pledged \| Construction and land development
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	6,288		6,404
Related allowance for credit losses	1,718		161
Collateral Pledged \| Agriculture real estate
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	3,186		1,695
Collateral Pledged \| Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	6,366		3,622
Related allowance for credit losses	1,396		$ 1,129
Collateral Pledged \| Agriculture production
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	$ 2,192