Investment Securities Debt Securities, Available-for-Sale - Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Amortized Cost
Due in one year or less	$ 3,044
Due after one, but within five years	101,461
Due after five, but within ten years	173,137
Due after ten years	273,549
Total debt securities	551,191	$ 491,290
Fair Value
Due in one year or less	3,064
Due after one, but within five years	108,845
Due after five, but within ten years	187,404
Due after ten years	282,990
Total debt securities	582,303	$ 504,788
Callable debt securities, fair value	$ 127,000