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	3 Months Ended	12 Months Ended
	Mar. 31, 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	$ 551,040	$ 601,100
Unrealized Losses	21,007	28,843
Fair Value, Less than 12 months	428,254	562,673
Unrealized Losses, Less than 12 months	12,358	23,116
Fair Value, 12 months or more	122,786	38,427
Unrealized Losses, 12 months or more	8,649	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	49,258	39,033
Unrealized Losses	742	967
Fair Value, Less than 12 months	29,898	39,033
Unrealized Losses, Less than 12 months	102	967
Fair Value, 12 months or more	19,360
Unrealized Losses, 12 months or more	640
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	75,298	100,875
Unrealized Losses	1,831	4,637
Fair Value, Less than 12 months	54,055	95,958
Unrealized Losses, Less than 12 months	967	4,187
Fair Value, 12 months or more	21,243	4,917
Unrealized Losses, 12 months or more	864	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	6,309	6,337
Unrealized Losses	3,253	3,225
Fair Value, 12 months or more	6,309	6,337
Unrealized Losses, 12 months or more	3,253	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	130,865	146,245
Unrealized Losses	5,826	8,829
Fair Value, Less than 12 months	83,953	134,991
Unrealized Losses, Less than 12 months	1,069	5,154
Fair Value, 12 months or more	46,912	11,254
Unrealized Losses, 12 months or more	4,757	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	286,390	298,165
Unrealized Losses	9,366	11,830
Fair Value, Less than 12 months	223,865	279,743
Unrealized Losses, Less than 12 months	6,417	10,650
Fair Value, 12 months or more	62,525	18,422
Unrealized Losses, 12 months or more	2,949	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	9,105	9,213
Unrealized Losses	272	425
Fair Value, Less than 12 months	9,105	9,213
Unrealized Losses, Less than 12 months	272	425
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	117,370	139,999
Unrealized Losses	5,384	7,526
Fair Value, Less than 12 months	104,021	131,248
Unrealized Losses, Less than 12 months	4,441	6,654
Fair Value, 12 months or more	13,349	8,751
Unrealized Losses, 12 months or more	943	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	7,310	7,478
Unrealized Losses	159	233
Fair Value, Less than 12 months	7,310	7,478
Unrealized Losses, Less than 12 months	159	233
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	420,175	454,855
Unrealized Losses	15,181	20,014
Fair Value, Less than 12 months	344,301	427,682
Unrealized Losses, Less than 12 months	11,289	17,962
Fair Value, 12 months or more	75,874	27,173
Unrealized Losses, 12 months or more	$ 3,892	$ 2,052