Derivative Financial Instruments - Additional Information (Details)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016 USD ($) Contract	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) Contract	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($) Contract	Apr. 04, 2013 USD ($)
Designated as Hedging Instrument [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Accumulated net, after tax (loss) gain included in other comprehensive loss	$ 257,000	$ (751,000)	$ (840,000)	$ (1,185,000)
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Period for which cash flow hedges will be used to hedge quarterly interest payments			5 years
Derivative inception date			Dec. 31, 2014
Derivative maturity date			Dec. 31, 2019
Description of variable rate basis for derivative			three-month LIBOR
Ineffectiveness related to interest rate swap designated as a cash flow hedge			$ 0	0
Accumulated net, after tax (loss) gain included in other comprehensive loss			$ (708,000)		$ (160,000)
The period over which OCI will be reclassified as interest expense			12 months
Estimated amount to be reclassified as an increase to interest expense	$ 442,000		$ 442,000
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Junior Subordinated Debentures [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total notional amount						$ 60,000,000
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Three-month LIBOR [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Swap fixed interest rate to be paid	1.66%		1.66%
Derivatives not Designated as Hedging Instruments [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total notional amount	$ 338,500,000		$ 338,500,000		$ 264,500,000
Net (negative) positive ineffectiveness on MSR fair value	$ (1,200,000)	$ 479,000	$ (2,700,000)	$ 3,900,000
Derivatives not Designated as Hedging Instruments [Member] | Beneficiary [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Number of risk participation agreements | Contract	2		2		2
Aggregate notional amount of credit risk participation agreements	$ 14,300,000		$ 14,300,000		$ 14,800,000
Derivatives not Designated as Hedging Instruments [Member] | Guarantor [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Number of risk participation agreements | Contract	5		5		1
Aggregate notional amount of credit risk participation agreements	$ 28,600,000		$ 28,600,000		$ 5,900,000
Derivatives not Designated as Hedging Instruments [Member] | Interest Rate Swap [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total notional amount	350,300,000		350,300,000		359,300,000
Termination value of derivatives	5,900,000		5,900,000		2,600,000
Collateral Posted	5,800,000		5,800,000
Derivatives not Designated as Hedging Instruments [Member] | Forward Contracts [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet obligations	301,500,000		301,500,000		190,500,000
Valuation adjustment			(1,200,000)		262,000
Derivatives not Designated as Hedging Instruments [Member] | Interest Rate Lock Commitments [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet obligations	$ 195,700,000		195,700,000		108,100,000
Valuation adjustment			$ 2,700,000		$ 1,100,000