Securities, Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Jun. 30, 2021
Available-for-sale Debt Securities, Amortized Cost [Abstract]
Within one year	$ 219,655
After one year through five years	8,787
After five years through ten years	25,517
After ten years	1,500
Total available-for-sale debt securities	255,459
Mortgage-backed securities	149,201
Amortized cost	404,660	$ 390,415
Available-for-sale Debt Securities, Fair Value [Abstract]
Within one year	219,736
After one year through five years	8,776
After five years through ten years	25,219
After ten years	1,500
Total available-for-sale debt securities	255,231
Mortgage-backed securities	146,393
Estimated fair value	401,624	390,890
Held-to-maturity Debt Securities, Amortized Cost [Abstract]
Within one year	62,888
After one year through five years	127,936
After five years through ten years	111,457
After ten years	171,453
Total held-to-maturity debt securities	473,734
Mortgage-backed securities	192,560
Amortized cost	666,294	496,914
Held-to-maturity Debt Securities, Fair Value [Abstract]
Within one year	63,591
After one year through five years	132,369
After five years through ten years	116,387
After ten years	177,050
Total held-to-maturity debt securities	489,397
Mortgage-backed securities	194,858
Estimated fair value	684,255	519,042
Total Debt Securities [Abstract]
Amortized cost	1,070,954	887,329
Estimated fair value	1,085,879	909,932
Securities pledged as collateral for deposits in excess of FDIC insurance limits, fair value	875,800	892,100
Securities pledged as collateral for potential borrowings at the Federal Reserve Bank discount window	$ 3,900	$ 3,900