Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Securities - Amortized Cost and Fair Value of Available for Sale and Held to Maturity Securities (Details)

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Note 4 - Securities - Amortized Cost and Fair Value of Available for Sale and Held to Maturity Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Available for sale, amortized cost $ 433,712 $ 423,330
Available for sale, gross unrealized gain 2,993 3,033
Available for sale, gross unrealized loss (1,380) (3,988)
Available for sale, fair value 435,325 422,375
Held to maturity, amortized cost 87,399 62,564
Held to maturity, gross unrealized gain 2,109 1,010
Held to maturity, gross unrealized loss (179) (272)
Held to maturity debt securities, fair value 89,329 63,302
US Treasury and Government [Member]    
Available for sale, amortized cost 56,518 45,998
Available for sale, gross unrealized gain 335 382
Available for sale, gross unrealized loss (75) (126)
Available for sale, fair value 56,778 46,254
Collateralized Mortgage Backed Securities [Member]    
Available for sale, amortized cost 243,465 228,843
Available for sale, gross unrealized gain 1,457 1,515
Available for sale, gross unrealized loss (1,179) (3,168)
Available for sale, fair value 243,743 227,190
Held to maturity, amortized cost 31,165 19,164
Held to maturity, gross unrealized gain 393 321
Held to maturity, gross unrealized loss (179) (245)
Held to maturity debt securities, fair value 31,379 19,240
US States and Political Subdivisions Debt Securities [Member]    
Available for sale, amortized cost 133,729 139,504
Available for sale, gross unrealized gain 1,201 1,120
Available for sale, gross unrealized loss (126) (694)
Available for sale, fair value 134,804 139,930
Held to maturity, amortized cost 5,726 5,888
Held to maturity, gross unrealized gain 300 315
Held to maturity, gross unrealized loss (12)
Held to maturity debt securities, fair value 6,026 6,191
Corporate Debt Securities [Member]    
Available for sale, amortized cost   8,985
Available for sale, gross unrealized gain   16
Available for sale, gross unrealized loss  
Available for sale, fair value   9,001
Held to maturity, amortized cost 50,508 37,512
Held to maturity, gross unrealized gain 1,416 374
Held to maturity, gross unrealized loss (15)
Held to maturity debt securities, fair value $ 51,924 $ 37,871