Note 3 - Investment Securities Available for Sale (Details) - Stated Reset Periods (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
Note 3 - Investment Securities Available for Sale (Details) - Stated Reset Periods [Line Items]
Carrying value, investment securities available for sale	$ 892,251		$ 912,443
CMBS [Member] | Less than six months [Member] | Investment Held in Securitization Trust [Member]
Note 3 - Investment Securities Available for Sale (Details) - Stated Reset Periods [Line Items]
Carrying value, investment securities available for sale			28,232
CMBS [Member] | More than twenty-four months [Member] | Investment Held in Securitization Trust [Member]
Note 3 - Investment Securities Available for Sale (Details) - Stated Reset Periods [Line Items]
Carrying value, investment securities available for sale	38,379		64,346
CMBS [Member] | Investment Held in Securitization Trust [Member]
Note 3 - Investment Securities Available for Sale (Details) - Stated Reset Periods [Line Items]
Carrying value, investment securities available for sale	38,379	[1]	92,578	[1]
CMBS [Member]
Note 3 - Investment Securities Available for Sale (Details) - Stated Reset Periods [Line Items]
Carrying value, investment securities available for sale	45,953
Less than six months [Member] | Agency RMBs [Member]
Note 3 - Investment Securities Available for Sale (Details) - Stated Reset Periods [Line Items]
Carrying value, investment securities available for sale	101,139		97,385
Less than six months [Member] | Non-Agency RMBS [Member]
Note 3 - Investment Securities Available for Sale (Details) - Stated Reset Periods [Line Items]
Carrying value, investment securities available for sale	2,040		2,361
Less than six months [Member] | Collateralized Loan Obligation [Member]
Note 3 - Investment Securities Available for Sale (Details) - Stated Reset Periods [Line Items]
Carrying value, investment securities available for sale	35,121		33,208
Less than six months [Member] | Investment Held in Securitization Trust [Member]
Note 3 - Investment Securities Available for Sale (Details) - Stated Reset Periods [Line Items]
Carrying value, investment securities available for sale			28,232
Less than six months [Member]
Note 3 - Investment Securities Available for Sale (Details) - Stated Reset Periods [Line Items]
Carrying value, investment securities available for sale	138,300		132,954
Six Months to Twenty-Four Months [Member] | Agency RMBs [Member]
Note 3 - Investment Securities Available for Sale (Details) - Stated Reset Periods [Line Items]
Carrying value, investment securities available for sale	17,533		14,823
Six Months to Twenty-Four Months [Member]
Note 3 - Investment Securities Available for Sale (Details) - Stated Reset Periods [Line Items]
Carrying value, investment securities available for sale	17,533		14,823
More than twenty-four months [Member] | Agency RMBs [Member]
Note 3 - Investment Securities Available for Sale (Details) - Stated Reset Periods [Line Items]
Carrying value, investment securities available for sale	690,465		764,666
More than twenty-four months [Member] | CMBS [Member]
Note 3 - Investment Securities Available for Sale (Details) - Stated Reset Periods [Line Items]
Carrying value, investment securities available for sale	45,953
More than twenty-four months [Member] | Investment Held in Securitization Trust [Member]
Note 3 - Investment Securities Available for Sale (Details) - Stated Reset Periods [Line Items]
Carrying value, investment securities available for sale	38,379		64,346
More than twenty-four months [Member]
Note 3 - Investment Securities Available for Sale (Details) - Stated Reset Periods [Line Items]
Carrying value, investment securities available for sale	736,418		764,666
Agency RMBs [Member]
Note 3 - Investment Securities Available for Sale (Details) - Stated Reset Periods [Line Items]
Carrying value, investment securities available for sale	809,137		876,874
Non-Agency RMBS [Member]
Note 3 - Investment Securities Available for Sale (Details) - Stated Reset Periods [Line Items]
Carrying value, investment securities available for sale	2,040		2,361
CMBS [Member]
Note 3 - Investment Securities Available for Sale (Details) - Stated Reset Periods [Line Items]
Carrying value, investment securities available for sale	45,953
Collateralized Loan Obligation [Member]
Note 3 - Investment Securities Available for Sale (Details) - Stated Reset Periods [Line Items]
Carrying value, investment securities available for sale	35,121		33,208
Investment Held in Securitization Trust [Member]
Note 3 - Investment Securities Available for Sale (Details) - Stated Reset Periods [Line Items]
Carrying value, investment securities available for sale	$ 38,379		$ 92,578

[1] CMBS investments have contractual maturities ranging from 0 to 10 years.