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Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Note 4 - Debt and Equity Securities (Details) - Available for Sale Securities With Gross Unrealized Losses and Their Fair Value [Line Items]
Fair Value	$ 281,021	$ 374,858
Unrealized Losses	3,925	7,259
Less Than 12 Months - Fair Value	204,675	97,274
Less Than 12 Months - Unrealized Losses	2,958	846
12 Months or More - Fair Value	76,346	277,584
12 Months or More - Unrealized Losses	967	6,413
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	77,680	39,287
Unrealized Losses	2,320	714
Less Than 12 Months - Fair Value	77,680	9,573
Less Than 12 Months - Unrealized Losses	2,320	428
12 Months or More - Fair Value	0	29,714
12 Months or More - Unrealized Losses	0	286
Municipals 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	5,233	8,810
Unrealized Losses	40	61
Less Than 12 Months - Fair Value	5,233	3,546
Less Than 12 Months - Unrealized Losses	40	11
12 Months or More - Fair Value	0	5,264
12 Months or More - Unrealized Losses	0	50
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	43,710	292
Unrealized Losses	89	8
Less Than 12 Months - Fair Value	43,413	0
Less Than 12 Months - Unrealized Losses	86	0
12 Months or More - Fair Value	297	292
12 Months or More - Unrealized Losses	3	8
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	126,623	48,389
Unrealized Losses	2,449	783
Less Than 12 Months - Fair Value	126,326	13,119
Less Than 12 Months - Unrealized Losses	2,446	439
12 Months or More - Fair Value	297	35,270
12 Months or More - Unrealized Losses	3	344
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	93,464	216,190
Unrealized Losses	869	4,627
Less Than 12 Months - Fair Value	44,618	77,382
Less Than 12 Months - Unrealized Losses	266	399
12 Months or More - Fair Value	48,846	138,808
12 Months or More - Unrealized Losses	603	4,228
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	7,364	8,358
Unrealized Losses	88	124
Less Than 12 Months - Fair Value	7,364	0
Less Than 12 Months - Unrealized Losses	88	0
12 Months or More - Fair Value	0	8,358
12 Months or More - Unrealized Losses	0	124
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	53,570	95,148
Unrealized Losses	519	1,717
Less Than 12 Months - Fair Value	26,367	0
Less Than 12 Months - Unrealized Losses	158	0
12 Months or More - Fair Value	27,203	95,148
12 Months or More - Unrealized Losses	361	1,717
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	154,398	326,469
Unrealized Losses	1,476	6,476
Less Than 12 Months - Fair Value	78,349	84,155
Less Than 12 Months - Unrealized Losses	512	407
12 Months or More - Fair Value	76,049	242,314
12 Months or More - Unrealized Losses	$ 964	6,069
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		6,773
Unrealized Losses		8
Less Than 12 Months - Fair Value		6,773
Less Than 12 Months - Unrealized Losses		8
12 Months or More - Fair Value		0
12 Months or More - Unrealized Losses		$ 0

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