Securities, Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Jun. 30, 2017
Available-for-sale Debt Securities, Amortized Cost [Abstract]
Within one year	$ 87,351
After one year through five years	4,808
After five years through ten years	2,513
After ten years	0
Total available for sale debt securities	94,672
Mortgage-backed and asset-backed securities	22,865
Equity securities	62	$ 62
Amortized cost	117,599	90,491
Available-for-sale Debt Securities, Fair Value [Abstract]
Within one year	87,462
After one through five years	4,847
After five through ten years	2,445
After ten years	0
Total available-for-sale debt securities	94,754
Mortgage-backed and asset-backed securities	22,667
Equity securities	206	184
Estimated fair value	117,627	91,483
Held-to-maturity Debt Securities, Amortized Cost [Abstract]
Within one year	22,243
After one year through five years	61,151
After five years through ten years	46,536
After ten years	17,360
Total held-to-maturity debt securities	147,290
Mortgage-backed	130,142
Amortized cost	277,432	223,830
Held-to-maturity Debt Securities, Fair Value [Abstract]
Within one year	22,383
After one year through five years	61,744
After five years through ten years	46,882
After ten years	18,309
Total held-to-maturity debt securities	149,318
Mortgage-backed	128,481
Estimated fair value	277,799	228,452
Total Securities [Abstract]
Amortized cost	395,031	314,321
Estimated fair value	395,426	319,935
Securities pledged as collateral for deposits in excess of FDIC insurance limits, fair value	381,800	305,700
Securities pledged as collateral for potential borrowings at the Federal Reserve Bank discount window	$ 1,700	$ 2,800