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Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Statement Of Financial Position [Abstract]
Investment securities held-to-maturity, fair value	$ 167,120	$ 100,483
Common Stock, Par Value	$ 1.00	$ 1.00
Common Stock, Shares Authorized	10,000,000	10,000,000
Common Stock, Shares, Issued	8,457,023	4,246,216
Common Stock, Shares, Outstanding	8,457,023	4,246,216
Series D Preferred Stock, Par Value	$ 1.00	$ 1.00
Series D Preferred Stock, Liquidation Preference, Value	$ 1,000	$ 1,000
Series D Preferred Stock, Shares Authorized	3,404	3,404
Series D Preferred Stock, Cumulative Dividend	9.00%	9.00%
Series D Stock ,Shares, Issued	3,404	0
Series D Preferred Stock, Shares Outstanding	3,404	0

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