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Note 5 - Investment Securities - Securities in a Continuous Unrealized Loss Position (Details) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Available for sale securities in a continuous unrealized loss position, less than 12 months, fair value $ 250,493 $ 185,784
Available for sale securities in a continuous unrealized loss position, less than 12 months, unrealized losses 5,890 1,818
Available for sale securities in a continuous unrealized loss position, 12 months or more, fair value 238,638 246,865
Available for sale securities in a continuous unrealized loss position, 12 months or more, unrealized losses 12,078 9,502
Available for sale securities in a continuous unrealized loss position, fair value 489,131 432,649
Available for sale securities in a continuous unrealized loss position, unrealized losses 17,968 11,320
Held to maturity securities in a continuous unrealized loss position, less than 12 months, fair value 232,345 154,170
Held to maturity securities in a continuous unrealized loss position, less than 12 months, unrealized losses 4,898 1,201
Held to maturity securities in a continuous unrealized loss position, 12 months or more, fair value 248,937 250,059
Held to maturity securities in a continuous unrealized loss position, 12 months or more, unrealized losses 12,551 7,624
Held to maturity securities in a continuous unrealized loss position, fair value 481,282 404,229
Held to maturity securities in a continuous unrealized loss position, unrealized losses 17,449 8,825
Collateralized Mortgage Obligations [Member]    
Available for sale securities in a continuous unrealized loss position, less than 12 months, fair value 176,823 150,075
Available for sale securities in a continuous unrealized loss position, less than 12 months, unrealized losses 4,600 1,565
Available for sale securities in a continuous unrealized loss position, 12 months or more, fair value 163,503 170,166
Available for sale securities in a continuous unrealized loss position, 12 months or more, unrealized losses 8,125 6,166
Available for sale securities in a continuous unrealized loss position, fair value 340,326 320,241
Available for sale securities in a continuous unrealized loss position, unrealized losses 12,725 7,731
Held to maturity securities in a continuous unrealized loss position, less than 12 months, fair value 122,102 56,955
Held to maturity securities in a continuous unrealized loss position, less than 12 months, unrealized losses 1,879 767
Held to maturity securities in a continuous unrealized loss position, 12 months or more, fair value 113,696 107,986
Held to maturity securities in a continuous unrealized loss position, 12 months or more, unrealized losses 5,141 3,203
Held to maturity securities in a continuous unrealized loss position, fair value 235,798 164,941
Held to maturity securities in a continuous unrealized loss position, unrealized losses 7,020 3,970
US Government Agencies Debt Securities [Member]    
Held to maturity securities in a continuous unrealized loss position, less than 12 months, fair value 55,240 42,045
Held to maturity securities in a continuous unrealized loss position, less than 12 months, unrealized losses 1,521 213
Held to maturity securities in a continuous unrealized loss position, 12 months or more, fair value 56,824 59,594
Held to maturity securities in a continuous unrealized loss position, 12 months or more, unrealized losses 3,295 2,022
Held to maturity securities in a continuous unrealized loss position, fair value 112,064 101,639
Held to maturity securities in a continuous unrealized loss position, unrealized losses 4,816 2,235
Agency Mortgage-backed Securities [Member]    
Available for sale securities in a continuous unrealized loss position, less than 12 months, fair value 47,543 29,967
Available for sale securities in a continuous unrealized loss position, less than 12 months, unrealized losses 946 226
Available for sale securities in a continuous unrealized loss position, 12 months or more, fair value 19,691 21,045
Available for sale securities in a continuous unrealized loss position, 12 months or more, unrealized losses 981 574
Available for sale securities in a continuous unrealized loss position, fair value 67,234 51,012
Available for sale securities in a continuous unrealized loss position, unrealized losses 1,927 800
Held to maturity securities in a continuous unrealized loss position, less than 12 months, fair value 55,003 55,170
Held to maturity securities in a continuous unrealized loss position, less than 12 months, unrealized losses 1,498 221
Held to maturity securities in a continuous unrealized loss position, 12 months or more, fair value 78,417 82,479
Held to maturity securities in a continuous unrealized loss position, 12 months or more, unrealized losses 4,115 2,399
Held to maturity securities in a continuous unrealized loss position, fair value 133,420 137,649
Held to maturity securities in a continuous unrealized loss position, unrealized losses 5,613 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 11,537 5,742
Available for sale securities in a continuous unrealized loss position, less than 12 months, unrealized losses 312 27
Available for sale securities in a continuous unrealized loss position, 12 months or more, fair value 2,539 2,656
Available for sale securities in a continuous unrealized loss position, 12 months or more, unrealized losses 152 35
Available for sale securities in a continuous unrealized loss position, fair value 14,076 8,398
Available for sale securities in a continuous unrealized loss position, unrealized losses 464 62
Corporate Debt Securities [Member]    
Available for sale securities in a continuous unrealized loss position, less than 12 months, fair value 1,646
Available for sale securities in a continuous unrealized loss position, less than 12 months, unrealized losses 5
Available for sale securities in a continuous unrealized loss position, 12 months or more, fair value 52,344 52,509
Available for sale securities in a continuous unrealized loss position, 12 months or more, unrealized losses 2,656 2,491
Available for sale securities in a continuous unrealized loss position, fair value 53,990 52,509
Available for sale securities in a continuous unrealized loss position, unrealized losses 2,661 2,491
Asset-backed Securities [Member]    
Available for sale securities in a continuous unrealized loss position, less than 12 months, fair value 12,944
Available for sale securities in a continuous unrealized loss position, less than 12 months, unrealized losses 27
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 12,944
Available for sale securities in a continuous unrealized loss position, unrealized losses 27
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 561 489
Available for sale securities in a continuous unrealized loss position, 12 months or more, unrealized losses 164 236
Available for sale securities in a continuous unrealized loss position, fair value 561 489
Available for sale securities in a continuous unrealized loss position, unrealized losses $ 164 $ 236