Investments Maturities of AFS Securities (Details) $ in Thousands	Jun. 30, 2019 USD ($)
Amortized Cost
Within one year	$ 43,131
After one, but within five years	266,198
After five, but within ten years	284,020
Greater than ten years	367,201
Total	960,550
Fair Value
Within one year	43,118
After one, but within five years	266,819
After five, but within ten years	285,133
Greater than ten years	371,661
Total	$ 966,731