Federal Home Loan Bank Advances and Other Borrowings - Activities in advances from the FHLB (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Activities in advances from the FHLB
Average balance outstanding	$ 58,814	$ 139,542
Maximum amount outstanding at any month-end during the year	278,000	340,000
Balance outstanding at end of year	$ 278,000	$ 148,000
Weighted average rate for securities sold under agreement to repurchase (as a percent)	0.59%	0.39%