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Loans and Allowance for Credit Losses - Classes of loans (Details) $ in Thousands | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2024 USD ($) loan | Jun. 30, 2024 USD ($) loan | Sep. 30, 2024 USD ($) | Dec. 31, 2023 USD ($) | Sep. 30, 2023 USD ($) | Jun. 30, 2023 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans (before deferred loan fees, net) | $ 4,027,181 | $ 3,850,035 |  |  |  |
Deferred loan fees, net | (202) | (232) |  |  |  |
Allowance for credit losses | (54,740) | (52,516) | $ (54,437) | $ (50,084) | $ (49,122) | $ (47,820)
Net loans | $ 3,972,239 | $ 3,797,287 |  |  |  |
Number of purchased participation loans | loan | 75 | 71 |  |  |  |
Purchased participation loans | $ 220,500 | $ 178,500 |  |  |  |
Commercial and industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans (before deferred loan fees, net) | 484,799 | 450,147 |  |  |  |
Allowance for credit losses | (8,063) | (6,233) | (6,114) | (5,850) | (5,134) | (5,235)
Agriculture production |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans (before deferred loan fees, net) | 188,284 | 175,968 |  |  |  |
Allowance for credit losses | (1,060) | (835) | (784) | (570) | (697) | (782)
Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans (before deferred loan fees, net) | 56,017 | 59,671 |  |  |  |
Allowance for credit losses | (603) | (578) | (526) | (454) | (453) | (490)
All other loans |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans (before deferred loan fees, net) | 3,628 | 3,981 |  |  |  |
Allowance for credit losses | (24) | (17) | (14) | (17) | (16) | (21)
Secured by real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans (before deferred loan fees, net) | 3,294,453 | 3,160,268 |  |  |  |
Allowance for credit losses | (12,664) |  | (10,637) | (9,574) | (9,371) |
Secured by real estate | 1-4 residential real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans (before deferred loan fees, net) | 967,196 | 925,397 |  |  |  |
Allowance for credit losses | (12,664) | (10,528) |  | (9,574) |  | (9,474)
Secured by real estate | 1-4 residential real estate | Non-owner occupied |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Allowance for credit losses | (13,660) |  | (20,728) |  |  |
Secured by real estate | Commercial Real Estate | Non-owner occupied |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans (before deferred loan fees, net) | 882,484 | 899,770 |  |  |  |
Allowance for credit losses | (13,660) | (19,055) |  | (16,599) | (16,504) | (13,863)
Secured by real estate | Commercial Real Estate | Owner occupied |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans (before deferred loan fees, net) | 435,392 | 427,476 |  |  |  |
Allowance for credit losses | (5,707) | (4,815) | (4,814) | (4,814) | (4,879) | (5,168)
Secured by real estate | Multi-family real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans (before deferred loan fees, net) | 376,081 | 384,564 |  |  |  |
Allowance for credit losses | (5,725) | (5,447) | (5,118) | (6,188) | (6,097) | (6,806)
Secured by real estate | Construction and land development |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans (before deferred loan fees, net) | 393,388 | 290,541 |  |  |  |
Allowance for credit losses | (4,717) | (2,901) | (3,675) | (3,639) | (3,545) | (3,414)
Secured by real estate | Agriculture real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Total loans (before deferred loan fees, net) | 239,912 | 232,520 |  |  |  |
Allowance for credit losses | $ (2,517) | $ (2,107) | $ (2,027) | $ (2,379) | $ (2,426) | $ (2,567)

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