Securities - Securities by Contractual Maturity (Details) - USD ($) $ in Thousands		Sep. 30, 2025	Jun. 30, 2025
Securities [Abstract]
Amortized cost, within one year		$ 207,808
Fair value, within one year		209,038
Amortized cost, after one year through five years		28,031
Fair value, after one year through five years		27,310
Amortized cost, after five years through ten years		8,500
Fair value, after five years through ten years		7,489
Amortized cost, after ten years		0
Fair value, after ten years		0
Amortized cost, total securities available-for-sale		244,339
Fair value, total securities available-for-sale		243,837
Amortized cost, mortgage-backed securities		121,931
Fair value, mortgage-backed securities		106,236
Amortized cost, total securities available-for-sale	[1]	366,270	$ 373,966
Fair value, total securities available-for-sale		350,073	356,062
Securities held-to-maturity
Amortized cost, within one year		57,765
Fair value, within one year		58,088
Amortized cost, after one year through five years		168,811
Fair value, after one year through five years		170,690
Amortized cost, after five years through ten years		211,205
Fair value, after five years through ten years		198,680
Amortized cost, after ten years		82,138
Fair value, after ten years		77,388
Amortized cost, total securities held-to-maturity		519,919
Fair value, total securities held-to-maturity		504,846
Amortized cost, mortgage-backed securities		267,812
Fair value, mortgage-backed securities		257,057
Amortized cost, total securities held-to-maturity	[2]	787,731	776,695
Fair value, total securities held-to-maturity		761,903	$ 738,134
Amortized cost		1,154,001
Fair value		$ 1,111,976

[1] Amortized cost excludes accrued interest receivable of $4.3 million and $4.5 million at September 30, 2025 and June 30, 2025, respectively, which is included in accrued interest receivable in the consolidated statements of financial condition.

[2] Amortized cost excludes accrued interest receivable of $5.8 million and $4.9 million at September 30, 2025 and June 30, 2025, respectively, which is included in accrued interest receivable in the consolidated statements of financial condition.