Long-Term Debt - Junior Subordinated Debt (Details) - Subsidiaries - Junior Subordinated Debt - Floating-Rate Debentures Due 2035 - Trust Preferred Securities - LIBOR	12 Months Ended
Dec. 31, 2020
First Charter Capital Trust I
Debt Instrument
Basis spread on variable rate (as a percent)	1.69%
First Charter Capital Trust II
Debt Instrument
Basis spread on variable rate (as a percent)	1.42%

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