Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020	Dec. 31, 2019
Cash and Cash Equivalents [Abstract]
Cash and Due From Banks	$ 45,602	$ 42,116	$ 32,525
Interest-Bearing Deposits at Banks	406,605	338,875	106,004
Total Cash and Cash Equivalents	452,207	380,991	138,529	$ 70,221
Total required reserves, including vault cash and Federal Reserve Bank deposits	0	0	0
Restricted cash pledged as collateral related to swap agreements and included in Cash and Due From Banks	$ 0	$ 500	$ 0