Securities, Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Jun. 30, 2021
Available-for-sale Debt Securities, Amortized Cost [Abstract]
Within one year	$ 231,649
After one year through five years	17,721
After five years through ten years	31,995
After ten years	1,500
Total available-for-sale debt securities	282,865
Mortgage-backed securities	144,893
Amortized cost	427,758	$ 390,415
Available-for-sale Debt Securities, Fair Value [Abstract]
Within one year	231,933
After one year through five years	17,038
After five years through ten years	29,982
After ten years	1,416
Total available-for-sale debt securities	280,369
Mortgage-backed securities	131,073
Estimated fair value	411,442	390,890
Held-to-maturity Debt Securities, Amortized Cost [Abstract]
Within one year	68,557
After one year through five years	150,823
After five years through ten years	121,481
After ten years	177,736
Total held-to-maturity debt securities	518,597
Mortgage-backed securities	211,142
Amortized cost	729,739	496,914
Held-to-maturity Debt Securities, Fair Value [Abstract]
Within one year	69,573
After one year through five years	156,939
After five years through ten years	128,808
After ten years	172,755
Total held-to-maturity debt securities	528,075
Mortgage-backed securities	201,878
Estimated fair value	729,953	519,042
Total Debt Securities [Abstract]
Amortized cost	1,157,497	887,329
Estimated fair value	$ 1,141,395	$ 909,932