Investment Securities Debt Securities -Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Amortized Cost, Within One Year	$ 11,425
Fair Value, Within One Year	11,478
Amortized Cost Basis, After One, But Within Five Years	85,244
Fair Value, After One, But Within Five Years	89,501
Amortized Cost, After Five, But Within Ten Years	165,531
Fair Value, After Five but Within Ten Years	174,885
Amortized Cost Basis, After Ten Years	220,499
Fair Value, After Ten Years	229,807
Debt Securities, Available-for-sale, Amortized Cost	482,699	$ 491,290
Debt Securities at fair value	505,671	$ 504,788
Callable debt securities, fair value	$ 89,800