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Note 6 - Investment Securities (Details) - The Amortized Costs and Estimated Fair Value of the Securities Portfolio - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Available For Sale    
Available for Sale Investment Securities - Amortized Cost $ 612,243 $ 618,429
Available for Sale Investment Securities - Gross Unrealized Gains 9,289 10,963
Available for Sale Investment Securities - Gross Unrealized Losses 3,235 3,004
Available for Sale Investment Securities 618,297 626,388
Held To Maturity    
Held to Maturity Securities - Amortized Cost 3,703 3,728
Held to Maturity Securities - Estimated Fair Value 3,871 3,923
US Government-sponsored Enterprises Debt Securities [Member]    
Available For Sale    
Available for Sale Investment Securities - Amortized Cost 131,378 110,094
Available for Sale Investment Securities - Gross Unrealized Gains 411 369
Available for Sale Investment Securities - Gross Unrealized Losses 632 1,015
Available for Sale Investment Securities 131,157 109,448
US States and Political Subdivisions Debt Securities [Member]    
Available For Sale    
Available for Sale Investment Securities - Amortized Cost 136,908 133,563
Available for Sale Investment Securities - Gross Unrealized Gains 2,248 2,600
Available for Sale Investment Securities - Gross Unrealized Losses 681 397
Available for Sale Investment Securities 138,475 135,766
Held To Maturity    
Held to Maturity Securities - Amortized Cost 3,703 3,728
Held to Maturity Securities - Gross Unrealized Gains 168 195
Held to Maturity Securities - Gross Unrealized Losses 0 0
Held to Maturity Securities - Estimated Fair Value 3,871 3,923
Residential Mortgage Backed Securities [Member]    
Available For Sale    
Available for Sale Investment Securities - Amortized Cost 323,087 363,729
Available for Sale Investment Securities - Gross Unrealized Gains 6,531 7,959
Available for Sale Investment Securities - Gross Unrealized Losses 1,361 1,199
Available for Sale Investment Securities 328,257 370,489
Commercial Mortgage Backed Securities [Member]    
Available For Sale    
Available for Sale Investment Securities - Amortized Cost 13,106 2,515
Available for Sale Investment Securities - Gross Unrealized Gains 78 7
Available for Sale Investment Securities - Gross Unrealized Losses 14 10
Available for Sale Investment Securities 13,170 2,512
Corporate Debt Securities [Member]    
Available For Sale    
Available for Sale Investment Securities - Amortized Cost 6,881 6,639
Available for Sale Investment Securities - Gross Unrealized Gains 19 26
Available for Sale Investment Securities - Gross Unrealized Losses 514 358
Available for Sale Investment Securities 6,386 6,307
Mutual Funds and Equity Securities [Member]    
Available For Sale    
Available for Sale Investment Securities - Amortized Cost 883 1,889
Available for Sale Investment Securities - Gross Unrealized Gains 2 2
Available for Sale Investment Securities - Gross Unrealized Losses 33 25
Available for Sale Investment Securities $ 852 $ 1,866