Equity Level 4 Capital Purchase Program Warrants (Details) - $ / shares shares in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Class of Warrant or Right [Line Items]
Warrants outstanding	2.2
Class of Warrant or Right, Exercise Price of Warrants or Rights	$ 8.964		$ 8.999
Warrant [Member]
Class of Warrant or Right [Line Items]
Warrants Exercised	0.1	1.0