Note 17 - Fair Value of Financial Instruments (Detail) - Assets and liabilities carried at fair value on a recurring basis, and the method used to determine their fair value: (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Liabilities:
Liabilities	$ 25,844	$ 26,311
Borrowings [Member] | Fair Value, Inputs, Level 3 [Member]
Liabilities:
Liabilities	23,922	26,311
Borrowings [Member]
Liabilities:
Liabilities	23,922	26,311
Interest Rate Swaps [Member] | Fair Value, Inputs, Level 2 [Member]
Liabilities:
Liabilities	1,922
Interest Rate Swaps [Member]
Liabilities:
Liabilities	1,922
Collateralized Mortgage Backed Securities [Member] | Available-for-sale Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Liabilities:
Assets	696,638	747,288
Collateralized Mortgage Backed Securities [Member] | Available-for-sale Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Liabilities:
Assets	23,475
Collateralized Mortgage Backed Securities [Member] | Available-for-sale Securities [Member]
Liabilities:
Assets	720,113	747,288
Other Securities [Member] | Available-for-sale Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Liabilities:
Assets	213,374	59,610
Other Securities [Member] | Available-for-sale Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Liabilities:
Assets	16,079	5,632
Other Securities [Member] | Available-for-sale Securities [Member]
Liabilities:
Assets	229,453	65,242
Interest Rate Caps [Member] | Available-for-sale Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Liabilities:
Assets	19	356
Interest Rate Caps [Member] | Available-for-sale Securities [Member]
Liabilities:
Assets	19	356
Interest Rate Swaps [Member] | Available-for-sale Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Liabilities:
Assets	3
Interest Rate Swaps [Member] | Available-for-sale Securities [Member]
Liabilities:
Assets	3
Available-for-sale Securities [Member] | Fair Value, Inputs, Level 2 [Member]
Liabilities:
Assets	910,034	807,254
Available-for-sale Securities [Member] | Fair Value, Inputs, Level 3 [Member]
Liabilities:
Assets	39,554	5,632
Available-for-sale Securities [Member]
Liabilities:
Assets	949,588	812,886
Fair Value, Inputs, Level 2 [Member]
Liabilities:
Liabilities	1,922
Fair Value, Inputs, Level 3 [Member]
Liabilities:
Liabilities	$ 23,922	$ 26,311