Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities with Gross Unrealized Losses and Their Fair Value (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities with Gross Unrealized Losses and Their Fair Value [Line Items]
Fair Value	$ 480,339	$ 601,100
Unrealized Losses	15,202	28,843
Fair Value, Less than 12 months	170,016	562,673
Unrealized Losses, Less than 12 months	2,064	23,116
Fair Value, 12 months or more	310,323	38,427
Unrealized Losses, 12 months or more	13,138	5,727
Corporate Debt Securities [Member]
Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities with Gross Unrealized Losses and Their Fair Value [Line Items]
Fair Value	39,373	39,033
Unrealized Losses	628	967
Fair Value, Less than 12 months	9,529	39,033
Unrealized Losses, Less than 12 months	472	967
Fair Value, 12 months or more	29,844
Unrealized Losses, 12 months or more	156
Municipal [Member]
Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities with Gross Unrealized Losses and Their Fair Value [Line Items]
Fair Value	32,355	100,875
Unrealized Losses	183	4,637
Fair Value, Less than 12 months	20,746	95,958
Unrealized Losses, Less than 12 months	34	4,187
Fair Value, 12 months or more	11,609	4,917
Unrealized Losses, 12 months or more	149	450
Other Debt Obligations [Member]
Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities with Gross Unrealized Losses and Their Fair Value [Line Items]
Fair Value	6,793	6,337
Unrealized Losses	2,770	3,225
Fair Value, 12 months or more	6,793	6,337
Unrealized Losses, 12 months or more	2,770	3,225
Available For Sale Securities Excluding Mortgage Backed Securities [Member]
Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities with Gross Unrealized Losses and Their Fair Value [Line Items]
Fair Value	78,521	146,245
Unrealized Losses	3,581	8,829
Fair Value, Less than 12 months	30,275	134,991
Unrealized Losses, Less than 12 months	506	5,154
Fair Value, 12 months or more	48,246	11,254
Unrealized Losses, 12 months or more	3,075	3,675
REMIC And CMO [Member]
Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities with Gross Unrealized Losses and Their Fair Value [Line Items]
Fair Value	266,921	298,165
Unrealized Losses	7,787	11,830
Fair Value, Less than 12 months	114,949	279,743
Unrealized Losses, Less than 12 months	1,379	10,650
Fair Value, 12 months or more	151,972	18,422
Unrealized Losses, 12 months or more	6,408	1,180
GNMA [Member]
Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities with Gross Unrealized Losses and Their Fair Value [Line Items]
Fair Value	8,581	9,213
Unrealized Losses	208	425
Fair Value, Less than 12 months		9,213
Unrealized Losses, Less than 12 months		425
Fair Value, 12 months or more	8,581
Unrealized Losses, 12 months or more	208
FNMA [Member]
Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities with Gross Unrealized Losses and Their Fair Value [Line Items]
Fair Value	114,411	139,999
Unrealized Losses	3,504	7,526
Fair Value, Less than 12 months	19,805	131,248
Unrealized Losses, Less than 12 months	134	6,654
Fair Value, 12 months or more	94,606	8,751
Unrealized Losses, 12 months or more	3,370	872
FHLMC [Member]
Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities with Gross Unrealized Losses and Their Fair Value [Line Items]
Fair Value	11,905	7,478
Unrealized Losses	122	233
Fair Value, Less than 12 months	4,987	7,478
Unrealized Losses, Less than 12 months	45	233
Fair Value, 12 months or more	6,918
Unrealized Losses, 12 months or more	77
Collateralized Mortgage Backed Securities [Member]
Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities with Gross Unrealized Losses and Their Fair Value [Line Items]
Fair Value	401,818	454,855
Unrealized Losses	11,621	20,014
Fair Value, Less than 12 months	139,741	427,682
Unrealized Losses, Less than 12 months	1,558	17,962
Fair Value, 12 months or more	262,077	27,173
Unrealized Losses, 12 months or more	$ 10,063	$ 2,052