Securities, Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Jun. 30, 2017
Available-for-sale Debt Securities, Amortized Cost [Abstract]
Within one year	$ 72,628
After one year through five years	4,814
After five years through ten years	997
After ten years	0
Total available for sale debt securities	78,439
Mortgage-backed and asset-backed securities	23,997
Equity securities	62	$ 62
Amortized cost	102,498	90,491
Available-for-sale Debt Securities, Fair Value [Abstract]
Within one year	72,719
After one through five years	4,896
After five through ten years	985
After ten years	0
Total available-for-sale debt securities	78,600
Mortgage-backed and asset-backed securities	24,167
Equity securities	202	184
Estimated fair value	102,969	91,483
Held-to-maturity Debt Securities, Amortized Cost [Abstract]
Within one year	18,927
After one year through five years	62,551
After five years through ten years	41,479
After ten years	14,521
Total held-to-maturity debt securities	137,478
Mortgage-backed	101,662
Amortized cost	239,140	223,830
Held-to-maturity Debt Securities, Fair Value [Abstract]
Within one year	19,112
After one year through five years	63,626
After five years through ten years	42,685
After ten years	15,753
Total held-to-maturity debt securities	141,176
Mortgage-backed	102,111
Estimated fair value	243,287	228,452
Total Securities [Abstract]
Amortized cost	341,638	314,321
Estimated fair value	346,256	319,935
Securities pledged as collateral for deposits in excess of FDIC insurance limits, fair value	334,200	305,700
Securities pledged as collateral for potential borrowings at the Federal Reserve Bank discount window	$ 1,300	$ 2,800