Note 6 - Debt and Equity Securities (Details) - Amortized Cost and Fair Value of Securities Available For Sale (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Note 6 - Debt and Equity Securities (Details) - Amortized Cost and Fair Value of Securities Available For Sale [Line Items]
Amortized Cost	$ 1,032,924	$ 915,947
Fair Value	1,017,790	949,566
Gross Unrealized Gains	13,709	41,391
Gross Unrealized Losses	28,843	7,772
Corporate Debt Securities [Member]
Note 6 - Debt and Equity Securities (Details) - Amortized Cost and Fair Value of Securities Available For Sale [Line Items]
Amortized Cost	100,362	83,389
Fair Value	101,711	87,485
Gross Unrealized Gains	2,316	4,096
Gross Unrealized Losses	967
Municipal [Member]
Note 6 - Debt and Equity Securities (Details) - Amortized Cost and Fair Value of Securities Available For Sale [Line Items]
Amortized Cost	127,967	74,228
Fair Value	123,423	75,297
Gross Unrealized Gains	93	1,152
Gross Unrealized Losses	4,637	83
Mutual Funds [Member]
Note 6 - Debt and Equity Securities (Details) - Amortized Cost and Fair Value of Securities Available For Sale [Line Items]
Amortized Cost	21,565	21,843
Fair Value	21,565	21,843
Other Debt Obligations [Member]
Note 6 - Debt and Equity Securities (Details) - Amortized Cost and Fair Value of Securities Available For Sale [Line Items]
Amortized Cost	18,160	17,797
Fair Value	14,935	13,315
Gross Unrealized Gains		17
Gross Unrealized Losses	3,225	4,499
Available For Sale Securities, Excluding Mortgage-Backed Securities [Member]
Note 6 - Debt and Equity Securities (Details) - Amortized Cost and Fair Value of Securities Available For Sale [Line Items]
Amortized Cost	268,054	228,666
Fair Value	261,634	229,453
Gross Unrealized Gains	2,409	5,369
Gross Unrealized Losses	8,829	4,582
REMIC And CMO [Member]
Note 6 - Debt and Equity Securities (Details) - Amortized Cost and Fair Value of Securities Available For Sale [Line Items]
Amortized Cost	494,984	453,468
Fair Value	489,670	474,050
Gross Unrealized Gains	6,516	23,690
Gross Unrealized Losses	11,830	3,108
GNMA [Member]
Note 6 - Debt and Equity Securities (Details) - Amortized Cost and Fair Value of Securities Available For Sale [Line Items]
Amortized Cost	38,974	43,211
Fair Value	40,874	46,932
Gross Unrealized Gains	2,325	3,721
Gross Unrealized Losses	425
FNMA [Member]
Note 6 - Debt and Equity Securities (Details) - Amortized Cost and Fair Value of Securities Available For Sale [Line Items]
Amortized Cost	217,615	168,040
Fair Value	212,322	175,929
Gross Unrealized Gains	2,233	7,971
Gross Unrealized Losses	7,526	82
FHLMC [Member]
Note 6 - Debt and Equity Securities (Details) - Amortized Cost and Fair Value of Securities Available For Sale [Line Items]
Amortized Cost	13,297	22,562
Fair Value	13,290	23,202
Gross Unrealized Gains	226	640
Gross Unrealized Losses	233
Collateralized Mortgage Obligations [Member]
Note 6 - Debt and Equity Securities (Details) - Amortized Cost and Fair Value of Securities Available For Sale [Line Items]
Amortized Cost	764,870	687,281
Fair Value	756,156	720,113
Gross Unrealized Gains	11,300	36,022
Gross Unrealized Losses	20,014	3,190
US Government Agencies Debt Securities [Member]
Note 6 - Debt and Equity Securities (Details) - Amortized Cost and Fair Value of Securities Available For Sale [Line Items]
Amortized Cost		31,409
Fair Value		31,513
Gross Unrealized Gains		$ 104