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	Jun. 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	$ 450,474	$ 601,100
Unrealized Losses	13,523	28,843
Fair Value, Less than 12 months	116,319	562,673
Unrealized Losses, Less than 12 months	1,262	23,116
Fair Value, 12 months or more	334,155	38,427
Unrealized Losses, 12 months or more	12,261	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	49,605	39,033
Unrealized Losses	395	967
Fair Value, Less than 12 months	9,809	39,033
Unrealized Losses, Less than 12 months	191	967
Fair Value, 12 months or more	39,796
Unrealized Losses, 12 months or more	204
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	44,859	100,875
Unrealized Losses	607	4,637
Fair Value, Less than 12 months	17,307	95,958
Unrealized Losses, Less than 12 months	49	4,187
Fair Value, 12 months or more	27,552	4,917
Unrealized Losses, 12 months or more	558	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	6,580	6,337
Unrealized Losses	2,982	3,225
Fair Value, 12 months or more	6,580	6,337
Unrealized Losses, 12 months or more	2,982	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	101,044	146,245
Unrealized Losses	3,984	8,829
Fair Value, Less than 12 months	27,116	134,991
Unrealized Losses, Less than 12 months	240	5,154
Fair Value, 12 months or more	73,928	11,254
Unrealized Losses, 12 months or more	3,744	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	236,976	298,165
Unrealized Losses	6,447	11,830
Fair Value, Less than 12 months	89,203	279,743
Unrealized Losses, Less than 12 months	1,022	10,650
Fair Value, 12 months or more	147,773	18,422
Unrealized Losses, 12 months or more	5,425	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	8,989	9,213
Unrealized Losses	132	425
Fair Value, Less than 12 months		9,213
Unrealized Losses, Less than 12 months		425
Fair Value, 12 months or more	8,989
Unrealized Losses, 12 months or more	132
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	96,273	139,999
Unrealized Losses	2,919	7,526
Fair Value, Less than 12 months		131,248
Unrealized Losses, Less than 12 months		6,654
Fair Value, 12 months or more	96,273	8,751
Unrealized Losses, 12 months or more	2,919	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	7,192	7,478
Unrealized Losses	41	233
Fair Value, Less than 12 months		7,478
Unrealized Losses, Less than 12 months		233
Fair Value, 12 months or more	7,192
Unrealized Losses, 12 months or more	41
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	349,430	454,855
Unrealized Losses	9,539	20,014
Fair Value, Less than 12 months	89,203	427,682
Unrealized Losses, Less than 12 months	1,022	17,962
Fair Value, 12 months or more	260,227	27,173
Unrealized Losses, 12 months or more	$ 8,517	$ 2,052