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, 2018
Dec. 31, 2017
Available for sale, amortized cost $ 590,445 $ 538,381
Available for sale, gross unrealized gain 900 3,221
Available for sale, gross unrealized loss (13,324) (3,522)
Available for sale, fair value 578,021 538,080
Held to maturity, amortized cost 250 250
Held to maturity, gross unrealized gain
Held to maturity, gross unrealized loss
Held to maturity debt securities, fair value 250 250 [1]
Held to maturity, gross unrealized loss
US Treasury and Government [Member]    
Available for sale, amortized cost 75,477 55,567
Available for sale, gross unrealized gain 2 38
Available for sale, gross unrealized loss (1,201) (249)
Available for sale, fair value 74,278 55,356
Collateralized Mortgage Backed Securities [Member]    
Available for sale, amortized cost 308,439 278,177
Available for sale, gross unrealized gain 407 1,006
Available for sale, gross unrealized loss (10,022) (2,685)
Available for sale, fair value 298,824 276,498
US States and Political Subdivisions Debt Securities [Member]    
Available for sale, amortized cost 113,613 134,641
Available for sale, gross unrealized gain 234 761
Available for sale, gross unrealized loss (1,149) (553)
Available for sale, fair value 112,698 134,849
Held to maturity, amortized cost 250 250
Held to maturity, gross unrealized gain
Held to maturity, gross unrealized loss
Held to maturity debt securities, fair value 250 250
Held to maturity, gross unrealized loss
Corporate Debt Securities [Member]    
Available for sale, amortized cost 92,916 69,996
Available for sale, gross unrealized gain 257 1,416
Available for sale, gross unrealized loss (952) (35)
Available for sale, fair value $ 92,221 $ 71,377
[1] Derived from audited financial statements.