Subordinated Debentures - Activities for our subordinated debentures (Details) - Subordinated Debentures - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Debt Instrument [Line Items]
Average balance outstanding	$ 69,347	$ 69,199
Maximum amount outstanding at any month-end during the year	69,383	69,263
Balance outstanding at end of year	$ 69,383	$ 69,263
Weighted average interest rate during the year (as a percent)	5.54%	5.69%