Loans and Allowance for Credit Losses - Loan portfolio aging analysis (Details)	12 Months Ended
	Jun. 30, 2025 USD ($) loan	Jun. 30, 2024 USD ($) loan
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	$ 4,100,768,000	$ 3,850,035,000
Number of PCD loans greater than 90 days past due | loan	3	1
Purchased credit-impaired loans	$ 6,200,000	$ 560,000
Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	25,623,000	9,201,000
30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	3,470,000	3,128,000
60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	2,593,000	2,621,000
Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	19,560,000	3,452,000
Current
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	4,075,145,000	3,840,834,000
Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	510,259,000	450,147,000
Commercial and industrial | Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	3,111,000	2,059,000
Commercial and industrial | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,055,000	641,000
Commercial and industrial | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	219,000	83,000
Commercial and industrial | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,837,000	1,335,000
Commercial and industrial | Current
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	507,148,000	448,088,000
Agriculture production
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	206,128,000	175,968,000
Agriculture production | Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	405,000	394,000
Agriculture production | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	163,000	50,000
Agriculture production | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	164,000
Agriculture production | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	78,000	344,000
Agriculture production | Current
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	205,723,000	175,574,000
Consumer
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	55,387,000	59,671,000
Consumer | Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	552,000	399,000
Consumer | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	380,000	311,000
Consumer | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	98,000	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	54,835,000	59,272,000
All other loans
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	5,102,000	3,981,000
All other loans | Current
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	5,102,000	3,981,000
Secured by real estate | 1-4 residential real estate
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	992,445,000	925,397,000
Secured by real estate | 1-4 residential real estate | Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	5,732,000	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	1,317,000	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	1,973,000	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	2,442,000	664,000
Secured by real estate | 1-4 residential real estate | Current
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	986,713,000	921,756,000
Secured by real estate | Commercial Real Estate | Non-owner occupied
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	888,317,000	899,770,000
Secured by real estate | Commercial Real Estate | Non-owner occupied | Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	5,846,000	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	62,000	107,000
Secured by real estate | Commercial Real Estate | Non-owner occupied | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	5,784,000
Secured by real estate | Commercial Real Estate | Non-owner occupied | Current
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	882,471,000	899,663,000
Secured by real estate | Commercial Real Estate | Owner occupied
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	442,984,000	427,476,000
Secured by real estate | Commercial Real Estate | Owner occupied | Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	1,105,000	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		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	116,000
Secured by real estate | Commercial Real Estate | Owner occupied | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	989,000	1,060,000
Secured by real estate | Commercial Real Estate | Owner occupied | Current
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	441,879,000	426,111,000
Secured by real estate | Multi-family real estate
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	422,758,000	384,564,000
Secured by real estate | Multi-family real estate | Current
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	422,758,000	384,564,000
Secured by real estate | Construction and land development
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	332,405,000	290,541,000
Secured by real estate | Construction and land development | Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	6,070,000	628,000
Secured by real estate | Construction and land development | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	315,000	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	12,000	377,000
Secured by real estate | Construction and land development | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	5,743,000
Secured by real estate | Construction and land development | Current
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	326,335,000	289,913,000
Secured by real estate | Agriculture real estate
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	244,983,000	232,520,000
Secured by real estate | Agriculture real estate | Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	2,802,000	608,000
Secured by real estate | Agriculture real estate | 30-59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	178,000	573,000
Secured by real estate | Agriculture real estate | 60 to 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	11,000
Secured by real estate | Agriculture real estate | Greater than 90 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	2,613,000	35,000
Secured by real estate | Agriculture real estate | Current
Financing Receivable, Past Due [Line Items]
Total Loans Receivable	$ 242,181,000	$ 231,912,000