Derivatives - Narrative (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($) derivative_swap	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) derivative_swap	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Derivatives, Fair Value [Line Items]
Collateral requirement threshold			$ 250,000
Collateral posted	$ 303,000		303,000		$ 216,000
Derivative notional amount	$ 19,500,000		$ 19,500,000		21,300,000
Number of derivatives | derivative_swap	4		4
Derivative fee income	$ 0	$ 0	$ 0	$ 0
Residential Mortgage Holding Company
Derivatives, Fair Value [Line Items]
Unfunded lending commitment	72,300,000		72,300,000		$ 71,300,000
Variable to Fixed
Derivatives, Fair Value [Line Items]
Derivative notional amount	$ 9,800,000		$ 9,800,000
Number of derivatives | derivative_swap	2		2
Fixed to Variable
Derivatives, Fair Value [Line Items]
Derivative notional amount	$ 9,800,000		$ 9,800,000
Number of derivatives | derivative_swap	2		2