Securities - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2025	Mar. 31, 2025		Jun. 30, 2024
Securities available-for-sale
Within one year, Amortized cost	$ 209,706
Within one year, Fair value	210,996
After one year through five years, Amortized cost	29,934
After one year through five years, Fair value	28,850
After five years through ten years, Amortized cost	10,423
After five years through ten years, Fair value	8,975
After ten years, Amortized cost	0
After ten years, Fair value	0
Total securities available-for-sale, Amortized cost	250,063
Total securities available-for-sale, Fair value	248,821
Mortgage-backed securities, Amortized cost	124,710
Mortgage-backed securities, Fair value	106,611
Total securities available-for-sale, Amortized cost	374,773	$ 374,773	[1]	$ 376,179	[1]
Total securities available-for-sale, Fair value	355,432	355,432		350,001
Securities held-to-maturity
Within one year, Amortized cost	57,162
Within one year, Fair value	56,926
After one year through five years, Amortized cost	164,448
After one year through five years, Fair value	162,784
After five years through ten years, Amortized cost	184,614
After five years through ten years, Fair value	167,486
After ten years, Amortized cost	99,817
After ten years, Fair value	87,773
Total securities held-to-maturity, Amortized cost	506,041
Total securities available-for-sale, Fair value	474,969
Mortgage-backed securities, Amortized cost	275,719
Mortgage-backed securities, Fair value	260,723
Total securities held-to-maturity, Amortized cost	781,760	781,760	[2]	690,837	[2]
Total securities held-to-maturity, Fair value	735,692	$ 735,692		$ 630,241
Total securities, Amortized cost	1,156,533
Total securities, Fair value	$ 1,091,124

[1] Amortized cost excludes accrued interest receivable of $5.2 million and $4.0 million at March 31, 2025 and June 30, 2024, respectively, which is included in accrued interest receivable in the consolidated statements of financial condition.

[2] Amortized cost excludes accrued interest receivable of $6.0 million and $4.1 million at March 31, 2025 and June 30, 2024, respectively, which is included in accrued interest receivable in the consolidated statements of financial condition.