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	6 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2012
Note 4 - Debt and Equity Securities (Details) - Available for sale securities with gross unrealized losses and their fair value [Line Items]
Fair Value	$ 480,776	$ 89,303
Unrealized Losses	21,642	7,772
Fair Value, Less than 12 months	455,362	60,764
Unrealized Losses, Less than 12 months	16,895	320
Fair Value, 12 months or more	25,414	28,539
Unrealized Losses, 12 months or more	4,747	7,452
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	43,834
Unrealized Losses	705
Fair Value, Less than 12 months	43,834
Unrealized Losses, Less than 12 months	705
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	81,280	9,782
Unrealized Losses	4,252	83
Fair Value, Less than 12 months	81,280	9,782
Unrealized Losses, Less than 12 months	4,252	83
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	6,271	5,064
Unrealized Losses	3,291	4,499
Fair Value, 12 months or more	6,271	5,064
Unrealized Losses, 12 months or more	3,291	4,499
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	131,385	14,846
Unrealized Losses	8,248	4,582
Fair Value, Less than 12 months	125,114	9,782
Unrealized Losses, Less than 12 months	4,957	83
Fair Value, 12 months or more	6,271	5,064
Unrealized Losses, 12 months or more	3,291	4,499
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	225,023	64,126
Unrealized Losses	7,546	3,108
Fair Value, Less than 12 months	205,880	40,651
Unrealized Losses, Less than 12 months	6,090	155
Fair Value, 12 months or more	19,143	23,475
Unrealized Losses, 12 months or more	1,456	2,953
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	9,801
Unrealized Losses	351
Fair Value, Less than 12 months	9,801
Unrealized Losses, Less than 12 months	351
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	106,512	10,331
Unrealized Losses	5,364	82
Fair Value, Less than 12 months	106,512	10,331
Unrealized Losses, Less than 12 months	5,364	82
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	8,055
Unrealized Losses	133
Fair Value, Less than 12 months	8,055
Unrealized Losses, Less than 12 months	133
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	349,391	74,457
Unrealized Losses	13,394	3,190
Fair Value, Less than 12 months	330,248	50,982
Unrealized Losses, Less than 12 months	11,938	237
Fair Value, 12 months or more	19,143	23,475
Unrealized Losses, 12 months or more	$ 1,456	$ 2,953