Note 6 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Note 6 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value [Line Items]
Fair Value, Total	$ 601,100	$ 89,303
Unrealized Losses, Total	28,843	7,772
Fair Value, Less Than 12 Months	562,673	60,764
Unrealized Losses, Less Than 12 Months	23,116	320
Fair Value, 12 Months or More	38,427	28,539
Unrealized Losses, 12 Months or More	5,727	7,452
Corporate Debt Securities [Member]
Note 6 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value [Line Items]
Fair Value, Total	39,033
Unrealized Losses, Total	967
Fair Value, Less Than 12 Months	39,033
Unrealized Losses, Less Than 12 Months	967
Municipal [Member]
Note 6 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value [Line Items]
Fair Value, Total	100,875	9,782
Unrealized Losses, Total	4,637	83
Fair Value, Less Than 12 Months	95,958	9,782
Unrealized Losses, Less Than 12 Months	4,187	83
Fair Value, 12 Months or More	4,917
Unrealized Losses, 12 Months or More	450
Other Debt Obligations [Member]
Note 6 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value [Line Items]
Fair Value, Total	6,337	5,064
Unrealized Losses, Total	3,225	4,499
Fair Value, 12 Months or More	6,337	5,064
Unrealized Losses, 12 Months or More	3,225	4,499
Available For Sale Securities, Excluding Mortgage-Backed Securities [Member]
Note 6 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value [Line Items]
Fair Value, Total	146,245	14,846
Unrealized Losses, Total	8,829	4,582
Fair Value, Less Than 12 Months	134,991	9,782
Unrealized Losses, Less Than 12 Months	5,154	83
Fair Value, 12 Months or More	11,254	5,064
Unrealized Losses, 12 Months or More	3,675	4,499
REMIC And CMO [Member]
Note 6 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value [Line Items]
Fair Value, Total	298,165	64,126
Unrealized Losses, Total	11,830	3,108
Fair Value, Less Than 12 Months	279,743	40,651
Unrealized Losses, Less Than 12 Months	10,650	155
Fair Value, 12 Months or More	18,422	23,475
Unrealized Losses, 12 Months or More	1,180	2,953
GNMA [Member]
Note 6 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value [Line Items]
Fair Value, Total	9,213
Unrealized Losses, Total	425
Fair Value, Less Than 12 Months	9,213
Unrealized Losses, Less Than 12 Months	425
FNMA [Member]
Note 6 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value [Line Items]
Fair Value, Total	139,999	10,331
Unrealized Losses, Total	7,526	82
Fair Value, Less Than 12 Months	131,248	10,331
Unrealized Losses, Less Than 12 Months	6,654	82
Fair Value, 12 Months or More	8,751
Unrealized Losses, 12 Months or More	872
FHLMC [Member]
Note 6 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value [Line Items]
Fair Value, Total	7,478
Unrealized Losses, Total	233
Fair Value, Less Than 12 Months	7,478
Unrealized Losses, Less Than 12 Months	233
Collateralized Mortgage Backed Securities [Member]
Note 6 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value [Line Items]
Fair Value, Total	454,855	74,457
Unrealized Losses, Total	20,014	3,190
Fair Value, Less Than 12 Months	427,682	50,982
Unrealized Losses, Less Than 12 Months	17,962	237
Fair Value, 12 Months or More	27,173	23,475
Unrealized Losses, 12 Months or More	$ 2,052	$ 2,953