Securities - Available-for-sale Securities in Continuous Loss Position (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2016 USD ($) investment	Dec. 31, 2015 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	$ 37,801	$ 83,561
Less than 12 Months, Gross Unrealized Losses	(266)	(537)
12 Months or Greater, Fair Value	11,269	16,325
12 Months or Greater, Gross Unrealized Losses	(174)	(509)
Total, Fair Value	49,070	99,886
Total, Gross Unrealized Losses	(440)	(1,046)
U.S. Government-sponsored enterprises (GSEs) [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	8,404	8,464
Less than 12 Months, Gross Unrealized Losses	(30)	(50)
12 Months or Greater, Fair Value	0	0
12 Months or Greater, Gross Unrealized Losses	0	0
Total, Fair Value	8,404	8,464
Total, Gross Unrealized Losses	$ (30)	(50)
Number of investments in unrealized loss positions | investment	4
Municipal securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	$ 1,552	2,456
Less than 12 Months, Gross Unrealized Losses	(6)	(17)
12 Months or Greater, Fair Value	0	0
12 Months or Greater, Gross Unrealized Losses	0	0
Total, Fair Value	1,552	2,456
Total, Gross Unrealized Losses	$ (6)	(17)
Number of investments in unrealized loss positions | investment	4
Mortgage-backed securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Less than 12 Months, Fair Value	$ 27,845	72,641
Less than 12 Months, Gross Unrealized Losses	(230)	(470)
12 Months or Greater, Fair Value	11,269	16,325
12 Months or Greater, Gross Unrealized Losses	(174)	(509)
Total, Fair Value	39,114	88,966
Total, Gross Unrealized Losses	$ (404)	$ (979)
Number of investments in unrealized loss positions | investment	32