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Note 3 - Investment Securities - Maturities of Investment Securities (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Held-to-maturity, amortized cost, one year or less $ 52,055  
Held-to-maturity, fair value, one year or less 52,034  
Available-for-sale, amortized cost, one year or less 1,552  
Available-for-sale, fair value, one year or less 1,552  
Held-to-maturity, amortized cost, after one through five years 122,870  
Held-to-maturity, fair value, after one through five years 123,029  
Available-for-sale, amortized cost, after one through five years 96,774  
Available-for-sale, fair value, after one through five years 95,688  
Held-to-maturity, amortized cost, after five through ten years 105,482  
Held-to-maturity, fair value, after five through ten years 106,097  
Available-for-sale, amortized cost, after five through ten years 12,756  
Available-for-sale, fair value, after five through ten years 12,539  
Held-to-maturity, amortized cost, after ten years 161,916  
Held-to-maturity, fair value, after ten years 165,213  
Available-for-sale, amortized cost, after ten years 138,697  
Available-for-sale, fair value, after ten years 132,335  
Held-to-maturity, amortized cost, securities not due on a single maturity date 19,773  
Held-to-maturity, fair value, securities not due on a single maturity date 19,587  
Available-for-sale, amortized cost, securities not due on a single maturity date 885,783  
Available-for-sale, fair value, securities not due on a single maturity date 868,324  
Available-for-sale, amortized cost, other securities (no maturity) 45,922  
Available-for-sale, fair value, other securities (no maturity) 46,916  
Held-to-maturity, amortized cost, total 462,096 $ 705,373
Held-to-maturity, fair value, total 465,960 713,371
Available-for-sale, amortized cost, total 1,181,484 824,992
Available-for-sale, fair value, total $ 1,157,354 $ 821,407