Note 4 - Debt and Equity Securities (Details) - Securities Available for Sale (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) - Securities Available for Sale [Line Items]
Amortized Cost	$ 1,058,903	$ 1,032,924
Fair Value	1,053,366	1,017,790
Gross Unrealized Gains	15,470	13,709
Gross Unrealized Losses	21,007	28,843
Corporate Debt Securities [Member]
Note 4 - Debt and Equity Securities (Details) - Securities Available for Sale [Line Items]
Amortized Cost	110,524	100,362
Fair Value	111,925	101,711
Gross Unrealized Gains	2,143	2,316
Gross Unrealized Losses	742	967
Municipal [Member]
Note 4 - Debt and Equity Securities (Details) - Securities Available for Sale [Line Items]
Amortized Cost	128,346	127,967
Fair Value	127,482	123,423
Gross Unrealized Gains	967	93
Gross Unrealized Losses	1,831	4,637
Mutual Funds [Member]
Note 4 - Debt and Equity Securities (Details) - Securities Available for Sale [Line Items]
Amortized Cost	26,697	21,565
Fair Value	26,697	21,565
Other Debt Obligations [Member]
Note 4 - Debt and Equity Securities (Details) - Securities Available for Sale [Line Items]
Amortized Cost	16,313	18,160
Fair Value	13,060	14,935
Gross Unrealized Losses	3,253	3,225
Available For Sale Securities Excluding Mortgage Backed Securities [Member]
Note 4 - Debt and Equity Securities (Details) - Securities Available for Sale [Line Items]
Amortized Cost	281,880	268,054
Fair Value	279,164	261,634
Gross Unrealized Gains	3,110	2,409
Gross Unrealized Losses	5,826	8,829
REMIC And CMO [Member]
Note 4 - Debt and Equity Securities (Details) - Securities Available for Sale [Line Items]
Amortized Cost	515,372	494,984
Fair Value	513,148	489,670
Gross Unrealized Gains	7,142	6,516
Gross Unrealized Losses	9,366	11,830
GNMA [Member]
Note 4 - Debt and Equity Securities (Details) - Securities Available for Sale [Line Items]
Amortized Cost	36,884	38,974
Fair Value	38,877	40,874
Gross Unrealized Gains	2,265	2,325
Gross Unrealized Losses	272	425
FNMA [Member]
Note 4 - Debt and Equity Securities (Details) - Securities Available for Sale [Line Items]
Amortized Cost	212,014	217,615
Fair Value	209,345	212,322
Gross Unrealized Gains	2,715	2,233
Gross Unrealized Losses	5,384	7,526
FHLMC [Member]
Note 4 - Debt and Equity Securities (Details) - Securities Available for Sale [Line Items]
Amortized Cost	12,753	13,297
Fair Value	12,832	13,290
Gross Unrealized Gains	238	226
Gross Unrealized Losses	159	233
Collateralized Mortgage Backed Securities [Member]
Note 4 - Debt and Equity Securities (Details) - Securities Available for Sale [Line Items]
Amortized Cost	777,023	764,870
Fair Value	774,202	756,156
Gross Unrealized Gains	12,360	11,300
Gross Unrealized Losses	$ 15,181	$ 20,014