Derivative Financial Instruments Part 1 (Details) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015 USD ($) Contract	Sep. 30, 2014 USD ($)	Sep. 30, 2015 USD ($) Contract	Sep. 30, 2014 USD ($)	Dec. 31, 2014 USD ($) Contract
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		$ 60,000
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
Accumulated net, after tax (loss) gain included in other comprehensive loss			$ (658)		$ 136
The period over which OCI will be reclassified as interest expense			12 months
Estimated amount to be reclassified as an increase to interest expense	$ 712		$ 712
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 amounts of futures contracts and option contracts	$ 267,500		$ 267,500		288,500
Net positive ineffectiveness on MSR fair value	479	$ 583	3,900	$ 3,000
Derivatives not Designated as Hedging Instruments [Member] | Forward Contracts [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance sheet obligations	244,000		244,000		142,000
Valuation adjustment	(2,500)		(2,500)		(1,000)
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	156,800		156,800		88,400
Valuation adjustment	2,700		2,700		1,300
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	318,800		318,800		349,400
Termination value of derivatives	4,900		4,900		$ 1,900
Collateral Posted	$ 3,000		$ 3,000
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		3
Aggregate notional amount of credit risk participation agreements	$ 14,900		$ 14,900		$ 19,100
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		1
Aggregate notional amount of credit risk participation agreements	$ 6,000		$ 6,000		$ 6,200