Loans and Allowance for Credit Losses - Loan portfolio aging analysis (Details)	6 Months Ended	12 Months Ended
	Dec. 31, 2024 USD ($) loan	Jun. 30, 2024 USD ($) loan
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	$ 4,027,181,000	$ 3,850,035,000
Number of PCD loans greater than 90 days past due | loan	3	1
Purchased credit-impaired loans	$ 558,000	$ 560,000
Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	13,352,000	9,201,000
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	4,097,000	3,128,000
60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	2,674,000	2,621,000
Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	6,581,000	3,452,000
Current
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	4,013,829,000	3,840,834,000
Construction and land development
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	393,388,000
Agriculture real estate
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	239,912,000
Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	484,799,000	450,147,000
Commercial and industrial | Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	3,438,000	2,059,000
Commercial and industrial | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,221,000	641,000
Commercial and industrial | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	541,000	83,000
Commercial and industrial | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,676,000	1,335,000
Commercial and industrial | Current
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	481,361,000	448,088,000
Agriculture production
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	188,284,000	175,968,000
Agriculture production | Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	115,000	394,000
Agriculture production | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	55,000	50,000
Agriculture production | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	60,000
Agriculture production | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		344,000
Agriculture production | Current
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	188,169,000	175,574,000
Consumer
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	56,017,000	59,671,000
Consumer | Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	642,000	399,000
Consumer | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	456,000	311,000
Consumer | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	112,000	74,000
Consumer | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	74,000	14,000
Consumer | Current
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	55,375,000	59,272,000
All other loans
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	3,628,000	3,981,000
All other loans | Current
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	3,628,000	3,981,000
Secured by real estate | 1-4 residential real estate
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	967,196,000	925,397,000
Secured by real estate | 1-4 residential real estate | Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	5,481,000	3,641,000
Secured by real estate | 1-4 residential real estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	841,000	890,000
Secured by real estate | 1-4 residential real estate | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,777,000	2,087,000
Secured by real estate | 1-4 residential real estate | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	2,863,000	664,000
Secured by real estate | 1-4 residential real estate | Current
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	961,715,000	921,756,000
Secured by real estate | Commercial Real Estate | Non-owner occupied
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	882,484,000	899,770,000
Secured by real estate | Commercial Real Estate | Non-owner occupied | Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	64,000	107,000
Secured by real estate | Commercial Real Estate | Non-owner occupied | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		107,000
Secured by real estate | Commercial Real Estate | Non-owner occupied | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	64,000
Secured by real estate | Commercial Real Estate | Non-owner occupied | Current
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	882,420,000	899,663,000
Secured by real estate | Commercial Real Estate | Owner occupied
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	435,392,000	427,476,000
Secured by real estate | Commercial Real Estate | Owner occupied | Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,457,000	1,365,000
Secured by real estate | Commercial Real Estate | Owner occupied | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,225,000	305,000
Secured by real estate | Commercial Real Estate | Owner occupied | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	89,000
Secured by real estate | Commercial Real Estate | Owner occupied | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	143,000	1,060,000
Secured by real estate | Commercial Real Estate | Owner occupied | Current
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	433,935,000	426,111,000
Secured by real estate | Multi-family real estate
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	376,081,000	384,564,000
Secured by real estate | Multi-family real estate | Current
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	376,081,000	384,564,000
Secured by real estate | Construction and land development
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	393,388,000	290,541,000
Secured by real estate | Construction and land development | Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	330,000	628,000
Secured by real estate | Construction and land development | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	299,000	251,000
Secured by real estate | Construction and land development | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	31,000	377,000
Secured by real estate | Construction and land development | Current
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	393,058,000	289,913,000
Secured by real estate | Agriculture real estate
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	239,912,000	232,520,000
Secured by real estate | Agriculture real estate | Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,825,000	608,000
Secured by real estate | Agriculture real estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable		573,000
Secured by real estate | Agriculture real estate | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,825,000	35,000
Secured by real estate | Agriculture real estate | Current
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	$ 238,087,000	$ 231,912,000