Cash and Cash Equivalents (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Cash and Cash Equivalents [Abstract]
Cash and Due From Banks	$ 42,116	$ 47,035
Interest-Bearing Deposits at Banks	338,875	23,186
Total Cash and Cash Equivalents	380,991	70,221	$ 84,239	$ 72,838
Total required reserves, including vault cash and Federal Reserve Bank deposits	0	35,985
Restricted cash pledged as collateral related to swap agreements and included in Cash and Due From Banks	$ 500	$ 0