Securities, Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Jun. 30, 2021
Available-for-sale Debt Securities, Amortized Cost [Abstract]
Within one year	$ 247,893
After one year through five years	19,679
After five years through ten years	30,014
After ten years	1,500
Total available-for-sale debt securities	299,086
Mortgage-backed and asset-backed securities	132,539
Amortized cost	431,625	$ 390,415
Available-for-sale Debt Securities, Fair Value [Abstract]
Within one year	247,992
After one year through five years	18,436
After five years through ten years	26,753
After ten years	1,275
Total available-for-sale debt securities	294,456
Mortgage-backed and asset-backed securities	113,606
Estimated fair value	408,062	390,890
Held-to-maturity Debt Securities, Amortized Cost [Abstract]
Within one year	67,643
After one year through five years	166,934
After five years through ten years	136,661
After ten years	176,232
Total held-to-maturity debt securities	547,470
Mortgage-backed securities	214,382
Amortized cost	761,852	496,914
Held-to-maturity Debt Securities, Fair Value [Abstract]
Within one year	67,283
After one year through five years	163,809
After five years through ten years	130,164
After ten years	150,949
Total held-to-maturity debt securities	512,205
Mortgage-backed securities	198,248
Estimated fair value	710,453	519,042
Total Debt Securities [Abstract]
Amortized cost	1,193,477	887,329
Estimated fair value	1,118,515	909,932
Debt Securities [Abstract]
Securities, fair value	892,900	892,100
Asset Pledged as Collateral [Member]
Debt Securities [Abstract]
Securities, fair value	$ 17,400	$ 3,900