Investment Securities - Summary of Maturities (Details) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Amortized Cost
Amortized Cost	$ 215,534	$ 231,791
Fair Value
Fair Value	220,699	235,821
Total debt securities
Amortized Cost
Within one year	90
After one year, but within five	8,527
After five years, but within ten	22,148
After ten years	170,608
Amortized Cost	201,373	219,544
Fair Value
Within one year	90
After one year, but within five	8,907
After five years, but within ten	22,946
After ten years	174,516
Fair Value	$ 206,459	$ 223,400