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Note 3 - Investment Securities - Maturities of Investment Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Held-to-maturity, amortized cost, one year or less $ 46,377  
Held-to-maturity, amortized cost, after one through five years 85,451  
Held-to-maturity, amortized cost, after five through ten years 92,361  
Held-to-maturity, amortized cost, after ten years 127,737  
Held-to-maturity, amortized cost, securities not due on a single maturity date 16,132  
Held-to-maturity, amortized cost, total 368,058 $ 462,096
Held-to-maturity, fair value, one year or less 46,255  
Held-to-maturity, fair value, after one through five years 85,581  
Held-to-maturity, fair value, after five through ten years 93,400  
Held-to-maturity, fair value, after ten years 132,209  
Held-to-maturity, fair value, securities not due on a single maturity date 15,853  
Held-to-maturity, fair value, total 373,298 465,960
Available-for-sale, amortized cost, one year or less 590  
Available-for-sale, amortized cost, after one through five years 35,616  
Available-for-sale, amortized cost, after five through ten years 24,203  
Available-for-sale, amortized cost, after ten years 225,892  
Available-for-sale, amortized cost, securities not due on a single maturity date 1,208,017  
Available-for-sale, amortized cost, other securities (no maturity) 118,006  
Available-for-sale, amortized cost, total 1,612,324 1,181,484
Available-for-sale, fair value, one year or less 591  
Available-for-sale, fair value, after one through five years 35,246  
Available-for-sale, fair value, after five through ten years 23,953  
Available-for-sale, fair value, after ten years 223,198  
Available-for-sale, fair value, securities not due on a single maturity date 1,187,317  
Available-for-sale, fair value, other securities (no maturity) 119,212  
Available-for-sale, fair value, total $ 1,589,517 $ 1,157,354