Investment Securities Other Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Other Investments Carrying Value [Line Items]
Investment in Federal Home Loan Bank Stock, Fair Value Disclosure	$ 29,728	$ 28,132
Federal Reserve Bank Stock	10,959	10,179
Other investment securities (a)	42,007	38,371
Other
Other Investments Carrying Value [Line Items]
Other Investments	1,026	60
Equity securities (a)
Other Investments Carrying Value [Line Items]
Other Investments	$ 294	$ 0