Note 10 - Fair Value of Financial Instruments (Details) - Fair value measured on a recurring basis: (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Note 10 - Fair Value of Financial Instruments (Details) - Fair value measured on a recurring basis: [Line Items]
Assets, carried at fair value on a recurring basis	$ 1,059,766	$ 949,588
Liabilities, carried at fair value on a recurring basis	26,465	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 recurring basis: [Line Items]
Assets, carried at fair value on a recurring basis	765,016	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 recurring basis: [Line Items]
Assets, carried at fair value on a recurring basis	20,194	23,475
Collateralized Mortgage Backed Securities [Member]
Note 10 - Fair Value of Financial Instruments (Details) - Fair value measured on a recurring basis: [Line Items]
Assets, carried at fair value on a recurring basis	785,210	720,113
Other securities [Member] | Fair Value, Inputs, Level 2 [Member]
Note 10 - Fair Value of Financial Instruments (Details) - Fair value measured on a recurring basis: [Line Items]
Assets, carried at fair value on a recurring basis	256,563	213,374
Other securities [Member] | Fair Value, Inputs, Level 3 [Member]
Note 10 - Fair Value of Financial Instruments (Details) - Fair value measured on a recurring basis: [Line Items]
Assets, carried at fair value on a recurring basis	16,781	16,079
Other securities [Member]
Note 10 - Fair Value of Financial Instruments (Details) - Fair value measured on a recurring basis: [Line Items]
Assets, carried at fair value on a recurring basis	273,344	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 recurring basis: [Line Items]
Assets, carried at fair value on a recurring basis		19
Interest rate caps [Member]
Note 10 - Fair Value of Financial Instruments (Details) - Fair value measured on a recurring basis: [Line Items]
Assets, carried at fair value on a recurring basis		19
Interest rate swaps [Member] | Fair Value, Inputs, Level 2 [Member]
Note 10 - Fair Value of Financial Instruments (Details) - Fair value measured on a recurring basis: [Line Items]
Assets, carried at fair value on a recurring basis	1,212	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 recurring basis: [Line Items]
Assets, carried at fair value on a recurring basis	1,212	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 recurring basis: [Line Items]
Liabilities, carried at fair value on a recurring basis	26,465	23,922
Borrowings [Member]
Note 10 - Fair Value of Financial Instruments (Details) - Fair value measured on a recurring basis: [Line Items]
Liabilities, carried at fair value on a recurring basis	26,465	23,922
Fair Value, Inputs, Level 2 [Member]
Note 10 - Fair Value of Financial Instruments (Details) - Fair value measured on a recurring basis: [Line Items]
Assets, carried at fair value on a recurring basis	1,022,791	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 recurring basis: [Line Items]
Assets, carried at fair value on a recurring basis	36,975	39,554
Liabilities, carried at fair value on a recurring basis	$ 26,465	$ 23,922