Fair Value Measurements Fair Value Measurements (Details 2) - 6 months ended Jun. 30, 2015 - Level 3 - Private Label CMOs - Fair Value, Measurements, Recurring [Member] - USD ($) $ in Thousands	Total
Level 3 CMO Roll Forward [Abstract]
Balance, December 31, 2014	$ 33,947
Total realized in earnings	471
Total unrealized loss in comprehensive income	(569)
Net settlements	(1,526)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	$ 32,323
Minimum [Member]
Unobservable Inputs Quantitative Information [Abstract]
Fair Value Inputs, Prepayment Rate	0.00%
Fair Value Inputs, Probability of Default	0.00%
Fair Value Inputs, Loss Severity	0.00%
Fair Value Inputs, Discount Rate	0.00%
Maximum [Member]
Unobservable Inputs Quantitative Information [Abstract]
Fair Value Inputs, Prepayment Rate	30.90%
Fair Value Inputs, Probability of Default	43.50%
Fair Value Inputs, Loss Severity	87.90%
Fair Value Inputs, Discount Rate	31.40%
Weighted Average [Member]
Unobservable Inputs Quantitative Information [Abstract]
Fair Value Inputs, Prepayment Rate	4.90%
Fair Value Inputs, Probability of Default	2.60%
Fair Value Inputs, Loss Severity	32.80%
Fair Value Inputs, Discount Rate	5.70%