Investment Securities Other Investments (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Other Investments Carrying Value [Line Items]
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure	$ 28,132	$ 28,132
Federal Reserve Bank Stock	10,179	10,179
Other investment securities (a)	46,756	38,371
Other
Other Investments Carrying Value [Line Items]
Other Investments	974	60
Equity securities (a)
Other Investments Carrying Value [Line Items]
Other Investments	$ 7,471	$ 0