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Note 6 - Investment Securities (Details) - The Amortized Costs and Estimated Fair Value of the Securities Portfolio - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Available For Sale    
Available for Sale Investment Securities - Amortized Cost $ 599,532 $ 618,429
Available for Sale Investment Securities - Gross Unrealized Gains 10,765 10,963
Available for Sale Investment Securities - Gross Unrealized Losses 1,787 3,004
Available for Sale Investment Securities 608,510 626,388
Held To Maturity    
Held to Maturity Securities - Amortized Cost 3,689 3,728
Held to Maturity Securities - Estimated Fair Value 3,893 3,923
US Government-sponsored Enterprises Debt Securities [Member]    
Available For Sale    
Available for Sale Investment Securities - Amortized Cost 126,197 110,094
Available for Sale Investment Securities - Gross Unrealized Gains 642 369
Available for Sale Investment Securities - Gross Unrealized Losses 155 1,015
Available for Sale Investment Securities 126,684 109,448
US States and Political Subdivisions Debt Securities [Member]    
Available For Sale    
Available for Sale Investment Securities - Amortized Cost 143,502 133,563
Available for Sale Investment Securities - Gross Unrealized Gains 2,648 2,600
Available for Sale Investment Securities - Gross Unrealized Losses 240 397
Available for Sale Investment Securities 145,910 135,766
Held To Maturity    
Held to Maturity Securities - Amortized Cost 3,689 3,728
Held to Maturity Securities - Gross Unrealized Gains 204 195
Held to Maturity Securities - Gross Unrealized Losses 0 0
Held to Maturity Securities - Estimated Fair Value 3,893 3,923
Residential Mortgage Backed Securities [Member]    
Available For Sale    
Available for Sale Investment Securities - Amortized Cost 306,466 363,729
Available for Sale Investment Securities - Gross Unrealized Gains 7,254 7,959
Available for Sale Investment Securities - Gross Unrealized Losses 460 1,199
Available for Sale Investment Securities 313,260 370,489
Commercial Mortgage Backed Securities [Member]    
Available For Sale    
Available for Sale Investment Securities - Amortized Cost 15,870 2,515
Available for Sale Investment Securities - Gross Unrealized Gains 205 7
Available for Sale Investment Securities - Gross Unrealized Losses 1 10
Available for Sale Investment Securities 16,074 2,512
Corporate Debt Securities [Member]    
Available For Sale    
Available for Sale Investment Securities - Amortized Cost 6,879 6,639
Available for Sale Investment Securities - Gross Unrealized Gains 16 26
Available for Sale Investment Securities - Gross Unrealized Losses 865 358
Available for Sale Investment Securities 6,030 6,307
Mutual Funds and Equity Securities [Member]    
Available For Sale    
Available for Sale Investment Securities - Amortized Cost 618 1,889
Available for Sale Investment Securities - Gross Unrealized Gains 0 2
Available for Sale Investment Securities - Gross Unrealized Losses 66 25
Available for Sale Investment Securities $ 552 $ 1,866