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Note 5 - Investment Securities - Securities in a Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Available for sale securities in a continuous unrealized loss position, less than 12 months, fair value $ 198,344 $ 185,784
Available for sale securities in a continuous unrealized loss position, less than 12 months, unrealized losses 5,984 1,818
Available for sale securities in a continuous unrealized loss position, 12 months or more, fair value 280,837 246,865
Available for sale securities in a continuous unrealized loss position, 12 months or more, unrealized losses 17,595 9,502
Available for sale securities in a continuous unrealized loss position, fair value 479,181 432,649
Available for sale securities in a continuous unrealized loss position, unrealized losses 23,579 11,320
Held to maturity securities in a continuous unrealized loss position, less than 12 months, fair value 180,760 154,170
Held to maturity securities in a continuous unrealized loss position, less than 12 months, unrealized losses 6,704 1,201
Held to maturity securities in a continuous unrealized loss position, 12 months or more, fair value 277,529 250,059
Held to maturity securities in a continuous unrealized loss position, 12 months or more, unrealized losses 17,112 7,624
Held to maturity securities in a continuous unrealized loss position, fair value 458,289 404,229
Held to maturity securities in a continuous unrealized loss position, unrealized losses 23,816 8,825
Collateralized Mortgage Obligations [Member]    
Available for sale securities in a continuous unrealized loss position, less than 12 months, fair value 136,643 150,075
Available for sale securities in a continuous unrealized loss position, less than 12 months, unrealized losses 4,278 1,565
Available for sale securities in a continuous unrealized loss position, 12 months or more, fair value 196,985 170,166
Available for sale securities in a continuous unrealized loss position, 12 months or more, unrealized losses 12,331 6,166
Available for sale securities in a continuous unrealized loss position, fair value 333,628 320,241
Available for sale securities in a continuous unrealized loss position, unrealized losses 16,609 7,731
Held to maturity securities in a continuous unrealized loss position, less than 12 months, fair value 112,206 56,955
Held to maturity securities in a continuous unrealized loss position, less than 12 months, unrealized losses 3,679 767
Held to maturity securities in a continuous unrealized loss position, 12 months or more, fair value 120,449 107,986
Held to maturity securities in a continuous unrealized loss position, 12 months or more, unrealized losses 6,447 3,203
Held to maturity securities in a continuous unrealized loss position, fair value 232,655 164,941
Held to maturity securities in a continuous unrealized loss position, unrealized losses 10,126 3,970
US Government Agencies Debt Securities [Member]    
Held to maturity securities in a continuous unrealized loss position, less than 12 months, fair value 42,809 42,045
Held to maturity securities in a continuous unrealized loss position, less than 12 months, unrealized losses 1,832 213
Held to maturity securities in a continuous unrealized loss position, 12 months or more, fair value 62,657 59,594
Held to maturity securities in a continuous unrealized loss position, 12 months or more, unrealized losses 4,252 2,022
Held to maturity securities in a continuous unrealized loss position, fair value 105,466 101,639
Held to maturity securities in a continuous unrealized loss position, unrealized losses 6,084 2,235
Agency Mortgage-backed Securities [Member]    
Available for sale securities in a continuous unrealized loss position, less than 12 months, fair value 41,522 29,967
Available for sale securities in a continuous unrealized loss position, less than 12 months, unrealized losses 1,388 226
Available for sale securities in a continuous unrealized loss position, 12 months or more, fair value 26,598 21,045
Available for sale securities in a continuous unrealized loss position, 12 months or more, unrealized losses 1,592 574
Available for sale securities in a continuous unrealized loss position, fair value 68,120 51,012
Available for sale securities in a continuous unrealized loss position, unrealized losses 2,980 800
Held to maturity securities in a continuous unrealized loss position, less than 12 months, fair value 25,745 55,170
Held to maturity securities in a continuous unrealized loss position, less than 12 months, unrealized losses 1,193 221
Held to maturity securities in a continuous unrealized loss position, 12 months or more, fair value 94,423 82,479
Held to maturity securities in a continuous unrealized loss position, 12 months or more, unrealized losses 6,413 2,399
Held to maturity securities in a continuous unrealized loss position, fair value 120,168 137,649
Held to maturity securities in a continuous unrealized loss position, unrealized losses 7,606 2,620
US States and Political Subdivisions Debt Securities [Member]    
Available for sale securities in a continuous unrealized loss position, less than 12 months, fair value 11,906 5,742
Available for sale securities in a continuous unrealized loss position, less than 12 months, unrealized losses 293 27
Available for sale securities in a continuous unrealized loss position, 12 months or more, fair value 4,892 2,656
Available for sale securities in a continuous unrealized loss position, 12 months or more, unrealized losses 309 35
Available for sale securities in a continuous unrealized loss position, fair value 16,798 8,398
Available for sale securities in a continuous unrealized loss position, unrealized losses 602 62
Corporate Debt Securities [Member]    
Available for sale securities in a continuous unrealized loss position, less than 12 months, fair value 1,604
Available for sale securities in a continuous unrealized loss position, less than 12 months, unrealized losses 3
Available for sale securities in a continuous unrealized loss position, 12 months or more, fair value 51,815 52,509
Available for sale securities in a continuous unrealized loss position, 12 months or more, unrealized losses 3,185 2,491
Available for sale securities in a continuous unrealized loss position, fair value 53,419 52,509
Available for sale securities in a continuous unrealized loss position, unrealized losses 3,188 2,491
Asset-backed Securities [Member]    
Available for sale securities in a continuous unrealized loss position, less than 12 months, fair value 6,669
Available for sale securities in a continuous unrealized loss position, less than 12 months, unrealized losses 22
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 6,669
Available for sale securities in a continuous unrealized loss position, unrealized losses 22
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 547 489
Available for sale securities in a continuous unrealized loss position, 12 months or more, unrealized losses 178 236
Available for sale securities in a continuous unrealized loss position, fair value 547 489
Available for sale securities in a continuous unrealized loss position, unrealized losses $ 178 $ 236