Note 4 - Debt and Equity Securities (Details) - Securities Available for Sale (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Note 4 - Debt and Equity Securities (Details) - Securities Available for Sale [Line Items]
Amortized Cost	$ 1,052,801	$ 1,032,924
Fair Value	1,058,682	1,017,790
Gross Unrealized Gains	19,404	13,709
Gross Unrealized Losses	13,523	28,843
Corporate Debt Securities [Member]
Note 4 - Debt and Equity Securities (Details) - Securities Available for Sale [Line Items]
Amortized Cost	110,686	100,362
Fair Value	112,577	101,711
Gross Unrealized Gains	2,286	2,316
Gross Unrealized Losses	395	967
Municipal [Member]
Note 4 - Debt and Equity Securities (Details) - Securities Available for Sale [Line Items]
Amortized Cost	133,892	127,967
Fair Value	135,262	123,423
Gross Unrealized Gains	1,977	93
Gross Unrealized Losses	607	4,637
Mutual Funds [Member]
Note 4 - Debt and Equity Securities (Details) - Securities Available for Sale [Line Items]
Amortized Cost	26,937	21,565
Fair Value	26,937	21,565
Other Debt Obligations [Member]
Note 4 - Debt and Equity Securities (Details) - Securities Available for Sale [Line Items]
Amortized Cost	16,343	18,160
Fair Value	13,361	14,935
Gross Unrealized Losses	2,982	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	287,858	268,054
Fair Value	288,137	261,634
Gross Unrealized Gains	4,263	2,409
Gross Unrealized Losses	3,984	8,829
REMIC And CMO [Member]
Note 4 - Debt and Equity Securities (Details) - Securities Available for Sale [Line Items]
Amortized Cost	512,453	494,984
Fair Value	514,622	489,670
Gross Unrealized Gains	8,616	6,516
Gross Unrealized Losses	6,447	11,830
GNMA [Member]
Note 4 - Debt and Equity Securities (Details) - Securities Available for Sale [Line Items]
Amortized Cost	33,588	38,974
Fair Value	35,642	40,874
Gross Unrealized Gains	2,186	2,325
Gross Unrealized Losses	132	425
FNMA [Member]
Note 4 - Debt and Equity Securities (Details) - Securities Available for Sale [Line Items]
Amortized Cost	206,666	217,615
Fair Value	207,819	212,322
Gross Unrealized Gains	4,072	2,233
Gross Unrealized Losses	2,919	7,526
FHLMC [Member]
Note 4 - Debt and Equity Securities (Details) - Securities Available for Sale [Line Items]
Amortized Cost	12,236	13,297
Fair Value	12,462	13,290
Gross Unrealized Gains	267	226
Gross Unrealized Losses	41	233
Collateralized Mortgage Backed Securities [Member]
Note 4 - Debt and Equity Securities (Details) - Securities Available for Sale [Line Items]
Amortized Cost	764,943	764,870
Fair Value	770,545	756,156
Gross Unrealized Gains	15,141	11,300
Gross Unrealized Losses	$ 9,539	$ 20,014