Fair Value Measurements (Details 2) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Warrants, Acquired From Acquisition		$ 4,914
Level 3 CMO Roll Forward [Abstract]
Gain on Sale of Investments	$ (274)
Proceeds from Issuance of Warrants	42
Stock and Warrants Issued During Period, Value, Preferred Stock and Warrants	435
Warrants Not Settleable in Cash, Fair Value Disclosure	5,033	4,914
Level 3 | Fair Value, Measurements, Recurring
Level 3 CMO Roll Forward [Abstract]
Warrants Not Settleable in Cash, Fair Value Disclosure	5,033	4,914
Level 3 | Private Label CMOs | Fair Value, Measurements, Recurring
Level 3 CMO Roll Forward [Abstract]
Balance, December 31, 2015	81,241
Total included in earnings	353
Total included in other comprehensive income	(1,251)
Net settlements	(5,128)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	75,215	81,241
Level 3 | Asset-backed and other securities | Fair Value, Measurements, Recurring
Level 3 CMO Roll Forward [Abstract]
Balance, December 31, 2015	18,200
Total included in earnings	15
Total included in other comprehensive income	(12)
Net settlements	(1,487)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	$ 16,716	$ 18,200
Level 3 | Minimum | Private Label CMOs | Fair Value, Measurements, Recurring
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%
Level 3 | Maximum | Private Label CMOs | Fair Value, Measurements, Recurring
Unobservable Inputs Quantitative Information [Abstract]
Fair Value Inputs, Prepayment Rate	22.44%
Fair Value Inputs, Probability of Default	13.73%
Fair Value Inputs, Loss Severity	96.94%
Fair Value Inputs, Discount Rate	57.25%
Level 3 | Weighted Average | Private Label CMOs | Fair Value, Measurements, Recurring
Unobservable Inputs Quantitative Information [Abstract]
Fair Value Inputs, Prepayment Rate	10.50%
Fair Value Inputs, Probability of Default	2.40%
Fair Value Inputs, Loss Severity	32.60%
Fair Value Inputs, Discount Rate	3.80%