Derivative Financial Instruments Schedule of interest rate derivatives designated as cash flow hedges (Details) (Designated as Hedging Instrument [Member], Cash Flow Hedging [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2014 Derivative	Dec. 31, 2013 Derivative
Other Assets [Member] | Forward-settle interest rate swap on anticipated debt [Member]
Derivative [Line Items]
Derivative Asset, Number of Instruments Held	0	8
Derivative Asset, Notional Amount	$ 0	$ 200,000
Derivative Asset, Fair Value	0	3,027
Other Assets [Member] | Interest rate swaps on FHLB advances [Member]
Derivative [Line Items]
Derivative Asset, Number of Instruments Held	4	0
Derivative Asset, Notional Amount	100,000	0
Derivative Asset, Fair Value	263	0
Other Assets [Member] | Interest rate swaps on FHLB advances [Member] | Interest rate cap on FHLB advances [Member]
Derivative [Line Items]
Derivative Asset, Number of Instruments Held	6	2
Derivative Asset, Notional Amount	150,000	50,000
Derivative Asset, Fair Value	6,094	3,554
Other Liabilities [Member] | Forward-settle interest rate swap on anticipated debt [Member]
Derivative [Line Items]
Derivative Liability, Number of Instruments Held	9	5
Derivative Liability, Notional Amount	225,000	125,000
Derivative Liability, Fair Value	$ (2,812)	$ (622)