Securities - Cost of Restricted Stock (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Schedule of Investments [Line Items]
Total restricted stock	$ 5,492	$ 6,224	[1]
FRB stock
Schedule of Investments [Line Items]
Total restricted stock	3,564	3,559
FHLB stock
Schedule of Investments [Line Items]
Total restricted stock	$ 1,928	$ 2,665

[1] Derived from audited consolidated financial statements.