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Note 4 - Debt and Equity Securities (Details) - Amortized Cost and Fair Value of Securities - USD ($)
Sep. 30, 2015
Dec. 31, 2014
Securites held-to-maturity:    
Amortized Cost-Held to Maturity $ 6,220,000 [1] $ 0
Fair Value-Held to Maturity [1] 6,220,000  
Securites available for sale:    
Amortized Cost-Available for sale 997,703,000 [1] 967,329,000
Fair Value-Available for sale 1,008,545,000 [1] 973,310,000
Gross Unrealized Gains-Available for sale 14,767,000 13,240,000
Gross Unrealized Losses-Available for sale 3,925,000 7,259,000
Municipals Debt Securities [Member]    
Securites held-to-maturity:    
Amortized Cost-Held to Maturity 6,220,000  
Fair Value-Held to Maturity 6,220,000  
Securites available for sale:    
Amortized Cost-Available for sale 128,363,000 145,864,000
Fair Value-Available for sale 132,486,000 148,896,000
Gross Unrealized Gains-Available for sale 4,163,000 3,093,000
Gross Unrealized Losses-Available for sale 40,000 61,000
Corporate Debt Securities [Member]    
Securites available for sale:    
Amortized Cost-Available for sale 115,959,000 90,719,000
Fair Value-Available for sale 114,063,000 91,273,000
Gross Unrealized Gains-Available for sale 424,000 1,268,000
Gross Unrealized Losses-Available for sale 2,320,000 714,000
Mutual Funds Debt Securities [Member]    
Securites available for sale:    
Amortized Cost-Available for sale 21,358,000 21,118,000
Fair Value-Available for sale 21,358,000 21,118,000
Other Debt Obligations [Member]    
Securites available for sale:    
Amortized Cost-Available for sale 50,683,000 7,098,000
Fair Value-Available for sale 50,594,000 7,090,000
Gross Unrealized Losses-Available for sale 89,000 8,000
Available For Sale Securities, Excluding Mortgage-Backed Securities [Member]    
Securites available for sale:    
Amortized Cost-Available for sale 316,363,000 264,799,000
Fair Value-Available for sale 318,501,000 268,377,000
Gross Unrealized Gains-Available for sale 4,587,000 4,361,000
Gross Unrealized Losses-Available for sale 2,449,000 783,000
REMIC And CMO [Member]    
Securites available for sale:    
Amortized Cost-Available for sale 487,677,000 504,207,000
Fair Value-Available for sale 493,688,000 505,768,000
Gross Unrealized Gains-Available for sale 6,880,000 6,188,000
Gross Unrealized Losses-Available for sale 869,000 4,627,000
GNMA [Member]    
Securites available for sale:    
Amortized Cost-Available for sale 12,179,000 13,862,000
Fair Value-Available for sale 12,446,000 14,159,000
Gross Unrealized Gains-Available for sale 355,000 421,000
Gross Unrealized Losses-Available for sale 88,000 124,000
FNMA [Member]    
Securites available for sale:    
Amortized Cost-Available for sale 168,966,000 169,956,000
Fair Value-Available for sale 171,191,000 170,367,000
Gross Unrealized Gains-Available for sale 2,744,000 2,128,000
Gross Unrealized Losses-Available for sale 519,000 1,717,000
FHLMC [Member]    
Securites available for sale:    
Amortized Cost-Available for sale 12,518,000 14,505,000
Fair Value-Available for sale 12,719,000 14,639,000
Gross Unrealized Gains-Available for sale 201,000 142,000
Gross Unrealized Losses-Available for sale 0 8,000
Collateralized Mortgage Obligations [Member]    
Securites available for sale:    
Amortized Cost-Available for sale 681,340,000 702,530,000
Fair Value-Available for sale 690,044,000 704,933,000
Gross Unrealized Gains-Available for sale 10,180,000 8,879,000
Gross Unrealized Losses-Available for sale $ 1,476,000 $ 6,476,000
[1] Expected maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.