Securities, Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Jun. 30, 2017
Available-for-sale Debt Securities, Amortized Cost [Abstract]
Within one year	$ 69,916
After one year through five years	4,822
After five years through ten years	0
After ten years	0
Total available for sale debt securities	74,738
Mortgage-backed and asset-backed securities	24,637
Equity securities	62	$ 62
Amortized cost	99,437	90,491
Available-for-sale Debt Securities, Fair Value [Abstract]
Within one year	70,248
After one through five years	4,958
After five through ten years	0
After ten years	0
Total available-for-sale debt securities	75,206
Mortgage-backed and asset-backed securities	25,409
Equity securities	194	184
Estimated fair value	100,809	91,483
Held-to-maturity Debt Securities, Amortized Cost [Abstract]
Within one year	17,851
After one year through five years	60,032
After five years through ten years	38,678
After ten years	12,118
Total held-to-maturity debt securities	128,679
Mortgage-backed	97,015
Amortized cost	225,694	223,830
Held-to-maturity Debt Securities, Fair Value [Abstract]
Within one year	18,085
After one year through five years	61,409
After five years through ten years	39,787
After ten years	12,922
Total held-to-maturity debt securities	132,203
Mortgage-backed	99,657
Estimated fair value	231,860	228,452
Total Securities [Abstract]
Amortized cost	325,131	314,321
Estimated fair value	332,669	319,935
Securities pledged as collateral for deposits in excess of FDIC insurance limits, fair value	319,100	305,700
Securities pledged as collateral for potential borrowings at the Federal Reserve Bank discount window	$ 2,300	$ 2,800