Derivative Instruments and Hedging Activities - Narrative (Details)		12 Months Ended
	Oct. 24, 2014 USD ($)	Dec. 31, 2016 USD ($) instrument	Dec. 31, 2015 USD ($)
Derivative [Line Items]
Loans receivable with fixed rates of interest maturity period	10 years
Loans receivable with fixed rates	$ 29,100,000
Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional Amount		$ 19,993,000	$ 19,269,000
Derivative Liabilities		254,000	438,000
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional Amount		107,448,000	73,995,000
Derivative Liabilities		$ 74,000	102,000
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Loans receivable with fixed rates of interest maturity period		15 years
Derivative fixed interest rate		7.43%
Notional Amount		$ 622,000
Loans receivable fixed interest rate (percentage)		7.43%
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member] | One-Month LIBOR [Member]
Derivative [Line Items]
Derivative spread on floating rate		2.24%
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivative Liabilities		$ 65,000
Interest Rate Swap [Member] | Cash Flow Hedging [Member]
Derivative [Line Items]
Derivative asset notional amount	$ 20,000,000.0
Derivative fixed interest rate	2.10%
Interest rate cash flow hedge gain (loss) to be reclassified during next 12 months		196,000
Interest Rate Swap [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional Amount		18,566,000	19,269,000
Interest Rate Swap [Member] | Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivative Liabilities		$ 217,000	$ 438,000
Interest Rate Swap [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member]
Derivative [Line Items]
Loans receivable with fixed rates of interest maturity period		10 years
Derivative fixed interest rate		5.83%
Notional Amount		$ 1,427,000
Loans receivable fixed interest rate (percentage)		5.83%
Interest Rate Swap [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | One-Month LIBOR [Member]
Derivative [Line Items]
Derivative spread on floating rate		3.50%
Interest Rate Swap [Member] | Fair Value Hedging [Member] | Designated as Hedging Instrument [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivative Liabilities		$ 37,000
Credit Risk Contract [Member] | Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Notional Amount		$ 27,919,000
Derivative number of instruments held | instrument		9
Credit Risk Contract [Member] | Not Designated as Hedging Instrument [Member] | Minimum [Member]
Derivative [Line Items]
Derivative remaining maturity		2 years
Credit Risk Contract [Member] | Not Designated as Hedging Instrument [Member] | Maximum [Member]
Derivative [Line Items]
Derivative remaining maturity		10 years
Credit Risk Contract [Member] | Not Designated as Hedging Instrument [Member] | Other Liabilities [Member]
Derivative [Line Items]
Derivative Liabilities		$ 9,000
Underlying derivative at fair value		$ 9,000