Note 4 - Debt and Equity Securities (Details) - Securities Available for Sale (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Note 4 - Debt and Equity Securities (Details) - Securities Available for Sale [Line Items]
Amortized Cost	$ 987,576	$ 1,032,924
Fair Value	984,377	1,017,790
Gross Unrealized Gains	12,003	13,709
Gross Unrealized Losses	15,202	28,843
Corporate Debt Securities [Member]
Note 4 - Debt and Equity Securities (Details) - Securities Available for Sale [Line Items]
Amortized Cost	100,611	100,362
Fair Value	101,490	101,711
Gross Unrealized Gains	1,507	2,316
Gross Unrealized Losses	628	967
Municipal [Member]
Note 4 - Debt and Equity Securities (Details) - Securities Available for Sale [Line Items]
Amortized Cost	143,450	127,967
Fair Value	146,086	123,423
Gross Unrealized Gains	2,819	93
Gross Unrealized Losses	183	4,637
Mutual Funds [Member]
Note 4 - Debt and Equity Securities (Details) - Securities Available for Sale [Line Items]
Amortized Cost	26,974	21,565
Fair Value	26,974	21,565
Other Debt Obligations [Member]
Note 4 - Debt and Equity Securities (Details) - Securities Available for Sale [Line Items]
Amortized Cost	16,388	18,160
Fair Value	13,618	14,935
Gross Unrealized Losses	2,770	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	287,423	268,054
Fair Value	288,168	261,634
Gross Unrealized Gains	4,326	2,409
Gross Unrealized Losses	3,581	8,829
REMIC And CMO [Member]
Note 4 - Debt and Equity Securities (Details) - Securities Available for Sale [Line Items]
Amortized Cost	497,457	494,984
Fair Value	495,375	489,670
Gross Unrealized Gains	5,705	6,516
Gross Unrealized Losses	7,787	11,830
GNMA [Member]
Note 4 - Debt and Equity Securities (Details) - Securities Available for Sale [Line Items]
Amortized Cost	14,617	38,974
Fair Value	14,839	40,874
Gross Unrealized Gains	430	2,325
Gross Unrealized Losses	208	425
FNMA [Member]
Note 4 - Debt and Equity Securities (Details) - Securities Available for Sale [Line Items]
Amortized Cost	173,048	217,615
Fair Value	170,943	212,322
Gross Unrealized Gains	1,399	2,233
Gross Unrealized Losses	3,504	7,526
FHLMC [Member]
Note 4 - Debt and Equity Securities (Details) - Securities Available for Sale [Line Items]
Amortized Cost	15,031	13,297
Fair Value	15,052	13,290
Gross Unrealized Gains	143	226
Gross Unrealized Losses	122	233
Collateralized Mortgage Backed Securities [Member]
Note 4 - Debt and Equity Securities (Details) - Securities Available for Sale [Line Items]
Amortized Cost	700,153	764,870
Fair Value	696,209	756,156
Gross Unrealized Gains	7,677	11,300
Gross Unrealized Losses	$ 11,621	$ 20,014