Securities, Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Jun. 30, 2019
Available-for-sale Debt Securities, Amortized Cost [Abstract]
Within one year	$ 125,147
After one year through five years	510
After five years through ten years	2,002
After ten years	2,000
Total available for sale debt securities	129,659
Mortgage-backed securities	28,845
Amortized cost	158,504
Available-for-sale Debt Securities, Fair Value [Abstract]
Within one year	125,521
After one through five years	526
After five through ten years	2,046
After ten years	1,971
Total available-for-sale debt securities	130,064
Mortgage-backed securities	29,199
Estimated fair value	159,263	$ 122,728
Held-to-maturity Debt Securities, Amortized Cost [Abstract]
Within one year	25,105
After one year through five years	74,861
After five years through ten years	43,093
After ten years	18,574
Total held-to-maturity debt securities	161,633
Mortgage-backed securities	142,949
Amortized cost	304,582	304,208
Held-to-maturity Debt Securities, Fair Value [Abstract]
Within one year	25,395
After one year through five years	76,755
After five years through ten years	45,660
After ten years	20,144
Total held-to-maturity debt securities	167,954
Mortgage-backed securities	147,368
Estimated fair value	315,322	313,613
Total Debt Securities [Abstract]
Amortized cost	463,086	425,810
Estimated fair value	474,585	436,341
Securities pledged as collateral for deposits in excess of FDIC insurance limits, fair value	460,900	425,700
Securities pledged as collateral for potential borrowings at the Federal Reserve Bank discount window	$ 4,500	$ 1,500