Securities, Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jun. 30, 2018
Available-for-sale Debt Securities, Amortized Cost [Abstract]
Within one year	$ 79,329
After one year through five years	2,525
After five years through ten years	2,513
After ten years	0
Total available for sale debt securities	84,367
Mortgage-backed securities	19,243
Amortized cost	103,610
Available-for-sale Debt Securities, Fair Value [Abstract]
Within one year	79,626
After one through five years	2,537
After five through ten years	2,507
After ten years	0
Total available-for-sale debt securities	84,670
Mortgage-backed securities	19,338
Estimated fair value	104,008	$ 120,806
Held-to-maturity Debt Securities, Amortized Cost [Abstract]
Within one year	26,727
After one year through five years	65,009
After five years through ten years	47,635
After ten years	17,191
Total held-to-maturity debt securities	156,562
Mortgage-backed securities	134,894
Amortized cost	291,456	274,550
Held-to-maturity Debt Securities, Fair Value [Abstract]
Within one year	26,944
After one year through five years	66,318
After five years through ten years	49,253
After ten years	18,417
Total held-to-maturity debt securities	160,932
Mortgage-backed securities	135,690
Estimated fair value	296,622	274,177
Total Debt Securities [Abstract]
Amortized cost	395,066	395,497
Estimated fair value	400,630	394,983
Securities pledged as collateral for deposits in excess of FDIC insurance limits, fair value	389,900	383,000
Securities pledged as collateral for potential borrowings at the Federal Reserve Bank discount window	$ 1,800	$ 1,800