Securities, Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Jun. 30, 2018
Available-for-sale Debt Securities, Amortized Cost [Abstract]
Within one year	$ 80,415
After one year through five years	4,534
After five years through ten years	2,514
After ten years	0
Total available for sale debt securities	87,463
Mortgage-backed securities	19,576
Amortized cost	107,039
Available-for-sale Debt Securities, Fair Value [Abstract]
Within one year	80,689
After one through five years	4,549
After five through ten years	2,440
After ten years	0
Total available-for-sale debt securities	87,678
Mortgage-backed securities	19,514
Estimated fair value	107,192	$ 120,806
Held-to-maturity Debt Securities, Amortized Cost [Abstract]
Within one year	27,070
After one year through five years	64,118
After five years through ten years	45,826
After ten years	17,859
Total held-to-maturity debt securities	154,873
Mortgage-backed securities	122,066
Amortized cost	276,939	274,550
Held-to-maturity Debt Securities, Fair Value [Abstract]
Within one year	27,217
After one year through five years	64,954
After five years through ten years	46,465
After ten years	18,821
Total held-to-maturity debt securities	157,457
Mortgage-backed securities	120,887
Estimated fair value	278,344	274,177
Total Debt Securities [Abstract]
Amortized cost	383,978	395,497
Estimated fair value	385,536	394,983
Securities pledged as collateral for deposits in excess of FDIC insurance limits, fair value	374,700	383,000
Securities pledged as collateral for potential borrowings at the Federal Reserve Bank discount window	$ 1,700	$ 1,700