Derivatives and Hedging Activities (Detail Textuals)	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($) Contract	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) Contract	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($) Contract
Credit risk
Derivative Instruments, Gain (Loss) [Line Items]
Collateral pledged toward derivatives	$ 32,000,000		$ 32,000,000
Cash flow hedging | Interest Rate Risk
Derivative Instruments, Gain (Loss) [Line Items]
Increase to deposit interest expense over next twelve months			1,210,000
Fair value hedging of interest rate risk
Derivative Instruments, Gain (Loss) [Line Items]
Recognized net gain (loss) related to ineffectiveness of hedging relationships	$ 1,510,000	$ 14,000	$ 2,370,000	$ 184,000
Fair value hedging of interest rate risk | Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Number of derivative contracts outstanding | Contract	1		1		13
Total notional amount designated as cash flow hedges	$ 12,800,000		$ 12,800,000		$ 156,000,000
Fair value hedging of interest rate risk | Pay fixed receive variable fair value hedge | Interest rate swaps
Derivative Instruments, Gain (Loss) [Line Items]
Number of derivative contracts outstanding | Contract	1		1		1
Total notional amount designated as cash flow hedges	$ 30,000,000		$ 30,000,000		$ 30,000,000
Interest expense | Fair value hedging of interest rate risk
Derivative Instruments, Gain (Loss) [Line Items]
Net reduction of interest expense/revenue	388,000	1,120,000	1,630,000	3,390,000
Interest revenue | Fair value hedging of interest rate risk | Corporate Bonds
Derivative Instruments, Gain (Loss) [Line Items]
Net reduction of interest expense/revenue	$ 262,000	$ 142,000	$ 508,000	$ 361,000