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Note 5 - Investment Securities - Securities in a Continuous Unrealized Loss Position (Details) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Available for sale securities in a continuous unrealized loss position, less than 12 months, fair value $ 251,406,000 $ 185,784,000
Available for sale securities in a continuous unrealized loss position, less than 12 months, unrealized losses 6,766,000 1,818,000
Available for sale securities in a continuous unrealized loss position, 12 months or more, fair value 237,610,000 246,865,000
Available for sale securities in a continuous unrealized loss position, 12 months or more, unrealized losses 13,499,000 9,502,000
Available for sale securities in a continuous unrealized loss position, fair value 489,016,000 432,649,000
Available for sale securities in a continuous unrealized loss position, unrealized losses 20,265,000 11,320,000
Held to maturity securities in a continuous unrealized loss position, less than 12 months, fair value 233,994,000 154,170,000
Held to maturity securities in a continuous unrealized loss position, less than 12 months, unrealized losses 6,354,000 1,201,000
Held to maturity securities in a continuous unrealized loss position, 12 months or more, fair value 245,264,000 250,059,000
Held to maturity securities in a continuous unrealized loss position, 12 months or more, unrealized losses 13,425,000 7,624,000
Held to maturity securities in a continuous unrealized loss position, fair value 479,258,000 404,229,000
Held to maturity securities in a continuous unrealized loss position, unrealized losses 19,779,000 8,825,000
Collateralized Mortgage Obligations [Member]    
Available for sale securities in a continuous unrealized loss position, less than 12 months, fair value 185,402,000 150,075,000
Available for sale securities in a continuous unrealized loss position, less than 12 months, unrealized losses 5,287,000 1,565,000
Available for sale securities in a continuous unrealized loss position, 12 months or more, fair value 161,540,000 170,166,000
Available for sale securities in a continuous unrealized loss position, 12 months or more, unrealized losses 8,913,000 6,166,000
Available for sale securities in a continuous unrealized loss position, fair value 346,942,000 320,241,000
Available for sale securities in a continuous unrealized loss position, unrealized losses 14,200,000 7,731,000
Held to maturity securities in a continuous unrealized loss position, less than 12 months, fair value 127,961,000 56,955,000
Held to maturity securities in a continuous unrealized loss position, less than 12 months, unrealized losses 2,607,000 767,000
Held to maturity securities in a continuous unrealized loss position, 12 months or more, fair value 114,305,000 107,986,000
Held to maturity securities in a continuous unrealized loss position, 12 months or more, unrealized losses 5,168,000 3,203,000
Held to maturity securities in a continuous unrealized loss position, fair value 242,266,000 164,941,000
Held to maturity securities in a continuous unrealized loss position, unrealized losses 7,775,000 3,970,000
US Government Agencies Debt Securities [Member]    
Held to maturity securities in a continuous unrealized loss position, less than 12 months, fair value 53,366,000 42,045,000
Held to maturity securities in a continuous unrealized loss position, less than 12 months, unrealized losses 1,772,000 213,000
Held to maturity securities in a continuous unrealized loss position, 12 months or more, fair value 55,380,000 59,594,000
Held to maturity securities in a continuous unrealized loss position, 12 months or more, unrealized losses 3,741,000 2,022,000
Held to maturity securities in a continuous unrealized loss position, fair value 108,746,000 101,639,000
Held to maturity securities in a continuous unrealized loss position, unrealized losses 5,513,000 2,235,000
Agency Mortgage-backed Securities [Member]    
Available for sale securities in a continuous unrealized loss position, less than 12 months, fair value 44,035,000 29,967,000
Available for sale securities in a continuous unrealized loss position, less than 12 months, unrealized losses 1,134,000 226,000
Available for sale securities in a continuous unrealized loss position, 12 months or more, fair value 21,087,000 21,045,000
Available for sale securities in a continuous unrealized loss position, 12 months or more, unrealized losses 1,153,000 574,000
Available for sale securities in a continuous unrealized loss position, fair value 65,122,000 51,012,000
Available for sale securities in a continuous unrealized loss position, unrealized losses 2,287,000 800,000
Held to maturity securities in a continuous unrealized loss position, less than 12 months, fair value 52,667,000 55,170,000
Held to maturity securities in a continuous unrealized loss position, less than 12 months, unrealized losses 1,975,000 221,000
Held to maturity securities in a continuous unrealized loss position, 12 months or more, fair value 75,579 82,479,000
Held to maturity securities in a continuous unrealized loss position, 12 months or more, unrealized losses 4,516,000 2,399,000
Held to maturity securities in a continuous unrealized loss position, fair value 128,246 137,649,000
Held to maturity securities in a continuous unrealized loss position, unrealized losses 6,491,000 2,620,000
US States and Political Subdivisions Debt Securities [Member]    
Available for sale securities in a continuous unrealized loss position, less than 12 months, fair value 13,384,000 5,742,000
Available for sale securities in a continuous unrealized loss position, less than 12 months, unrealized losses 319,000 27,000
Available for sale securities in a continuous unrealized loss position, 12 months or more, fair value 2,540,000 2,656,000
Available for sale securities in a continuous unrealized loss position, 12 months or more, unrealized losses 151,000 35,000
Available for sale securities in a continuous unrealized loss position, fair value 15,924,000 8,398,000
Available for sale securities in a continuous unrealized loss position, unrealized losses 470,000 62,000
Corporate Debt Securities [Member]    
Available for sale securities in a continuous unrealized loss position, less than 12 months, fair value 1,627,000
Available for sale securities in a continuous unrealized loss position, less than 12 months, unrealized losses 2,000
Available for sale securities in a continuous unrealized loss position, 12 months or more, fair value 51,896,000 52,509,000
Available for sale securities in a continuous unrealized loss position, 12 months or more, unrealized losses 3,104,000 2,491,000
Available for sale securities in a continuous unrealized loss position, fair value 53,523,000 52,509,000
Available for sale securities in a continuous unrealized loss position, unrealized losses 3,106,000 2,491,000
Asset-backed Securities [Member]    
Available for sale securities in a continuous unrealized loss position, less than 12 months, fair value 6,958,000
Available for sale securities in a continuous unrealized loss position, less than 12 months, unrealized losses 24,000
Available for sale securities in a continuous unrealized loss position, 12 months or more, fair value
Available for sale securities in a continuous unrealized loss position, 12 months or more, unrealized losses
Available for sale securities in a continuous unrealized loss position, fair value 6,958,000
Available for sale securities in a continuous unrealized loss position, unrealized losses 24,000
Collateralized Debt Obligations [Member]    
Available for sale securities in a continuous unrealized loss position, less than 12 months, fair value
Available for sale securities in a continuous unrealized loss position, less than 12 months, unrealized losses
Available for sale securities in a continuous unrealized loss position, 12 months or more, fair value 547,000 489,000
Available for sale securities in a continuous unrealized loss position, 12 months or more, unrealized losses 178,000 236,000
Available for sale securities in a continuous unrealized loss position, fair value 547,000 489,000
Available for sale securities in a continuous unrealized loss position, unrealized losses $ 178,000 $ 236,000