Derivative Financial Instruments - Additional Information (Details)	12 Months Ended
	Dec. 31, 2015 USD ($) Contract	Dec. 31, 2014 USD ($) Contract	Dec. 31, 2013 USD ($)	Apr. 04, 2013 USD ($)
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	$ (812,000)	$ (1,387,000)	$ 1,524,000
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total notional amounts of futures contracts and option contracts				$ 60,000,000
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
Interest rate swap designated as a cash flow hedge	$ 0	0
Accumulated net, after tax (loss) gain included in other comprehensive loss	$ (160,000)	136,000
The period over which OCI will be reclassified as interest expense	12 months
Estimated amount to be reclassified as an increase to interest expense	$ 495,000
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%
Derivatives not Designated as Hedging Instruments [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total notional amounts of futures contracts and option contracts	$ 264,500,000	288,500,000
Net positive ineffectiveness on MSR fair value	$ 1,900,000	$ 3,100,000
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	3
Aggregate notional amount of credit risk participation agreements	$ 14,800,000	$ 19,100,000
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	1	1
Aggregate notional amount of credit risk participation agreements	$ 5,900,000	$ 6,200,000
Derivatives not Designated as Hedging Instruments [Member] | Interest Rate Swap [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Total notional amounts of futures contracts and option contracts	359,300,000	349,400,000
Termination value of derivatives	2,600,000	1,900,000
Collateral Posted	2,200,000
Derivatives not Designated as Hedging Instruments [Member] | Forward Contracts [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet obligations	190,500,000	142,000,000
Valuation adjustment	262,000	(1,000,000)
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	108,100,000	88,400,000
Valuation adjustment	$ 1,100,000	$ 1,300,000