Securities, Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Jun. 30, 2018
Available-for-sale Debt Securities, Amortized Cost [Abstract]
Within one year	$ 99,795
After one year through five years	767
After five years through ten years	2,255
After ten years	0
Total available-for-sale debt securities	102,817
Mortgage-backed securities	18,785
Amortized cost	121,602
Available-for-sale Debt Securities, Fair Value [Abstract]
Within one year	100,607
After one year through five years	779
After five years through ten years	2,287
After ten years	0
Total available-for-sale debt securities	103,673
Mortgage-backed securities	19,055
Estimated fair value	122,728	$ 120,806
Held-to-maturity Debt Securities, Amortized Cost [Abstract]
Within one year	23,317
After one year through five years	72,777
After five years through ten years	49,864
After ten years	18,710
Total held-to-maturity debt securities	164,668
Mortgage-backed	139,540
Amortized cost	304,208	274,550
Held-to-maturity Debt Securities, Fair Value [Abstract]
Within one year	23,676
After one year through five years	74,804
After five years through ten years	52,133
After ten years	20,258
Total held-to-maturity debt securities	170,871
Mortgage-backed securities	142,742
Estimated fair value	313,613	274,177
Total Debt Securities [Abstract]
Amortized cost	425,810	395,497
Estimated fair value	436,341	394,983
Securities pledged as collateral for deposits in excess of FDIC insurance limits, fair value	425,700	383,000
Securities pledged as collateral for potential borrowings at the Federal Reserve Bank discount window	$ 1,500	$ 1,700