Note 10 - Fair Value of Financial Instruments (Details) - Fair value measured on a non-recurring basis: (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Note 10 - Fair Value of Financial Instruments (Details) - Fair value measured on a non-recurring basis: [Line Items]
Assets, carried at fair value on a recurring basis	$ 1,041,377	$ 949,588
Liabilities, carried at fair value on a recurring basis	26,192	25,844
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Note 10 - Fair Value of Financial Instruments (Details) - Fair value measured on a non-recurring basis: [Line Items]
Assets, carried at fair value on a recurring basis	759,458	696,638
Collateralized Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Note 10 - Fair Value of Financial Instruments (Details) - Fair value measured on a non-recurring basis: [Line Items]
Assets, carried at fair value on a recurring basis	22,930	23,475
Collateralized Mortgage Backed Securities [Member]
Note 10 - Fair Value of Financial Instruments (Details) - Fair value measured on a non-recurring basis: [Line Items]
Assets, carried at fair value on a recurring basis	782,388	720,113
Other securities [Member] | Fair Value, Inputs, Level 2 [Member]
Note 10 - Fair Value of Financial Instruments (Details) - Fair value measured on a non-recurring basis: [Line Items]
Assets, carried at fair value on a recurring basis	240,641	213,374
Other securities [Member] | Fair Value, Inputs, Level 3 [Member]
Note 10 - Fair Value of Financial Instruments (Details) - Fair value measured on a non-recurring basis: [Line Items]
Assets, carried at fair value on a recurring basis	17,694	16,079
Other securities [Member]
Note 10 - Fair Value of Financial Instruments (Details) - Fair value measured on a non-recurring basis: [Line Items]
Assets, carried at fair value on a recurring basis	258,335	229,453
Interest rate caps [Member] | Fair Value, Inputs, Level 2 [Member]
Note 10 - Fair Value of Financial Instruments (Details) - Fair value measured on a non-recurring basis: [Line Items]
Assets, carried at fair value on a recurring basis	8	19
Interest rate caps [Member]
Note 10 - Fair Value of Financial Instruments (Details) - Fair value measured on a non-recurring basis: [Line Items]
Assets, carried at fair value on a recurring basis	8	19
Interest rate swaps [Member] | Fair Value, Inputs, Level 2 [Member]
Note 10 - Fair Value of Financial Instruments (Details) - Fair value measured on a non-recurring basis: [Line Items]
Assets, carried at fair value on a recurring basis	646	3
Liabilities, carried at fair value on a recurring basis		1,922
Interest rate swaps [Member]
Note 10 - Fair Value of Financial Instruments (Details) - Fair value measured on a non-recurring basis: [Line Items]
Assets, carried at fair value on a recurring basis	646	3
Liabilities, carried at fair value on a recurring basis		1,922
Borrowings [Member] | Fair Value, Inputs, Level 3 [Member]
Note 10 - Fair Value of Financial Instruments (Details) - Fair value measured on a non-recurring basis: [Line Items]
Liabilities, carried at fair value on a recurring basis	26,192	23,922
Borrowings [Member]
Note 10 - Fair Value of Financial Instruments (Details) - Fair value measured on a non-recurring basis: [Line Items]
Liabilities, carried at fair value on a recurring basis	26,192	23,922
Fair Value, Inputs, Level 2 [Member]
Note 10 - Fair Value of Financial Instruments (Details) - Fair value measured on a non-recurring basis: [Line Items]
Assets, carried at fair value on a recurring basis	1,000,753	910,034
Liabilities, carried at fair value on a recurring basis		1,922
Fair Value, Inputs, Level 3 [Member]
Note 10 - Fair Value of Financial Instruments (Details) - Fair value measured on a non-recurring basis: [Line Items]
Assets, carried at fair value on a recurring basis	40,624	39,554
Liabilities, carried at fair value on a recurring basis	$ 26,192	$ 23,922