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
Mar. 31, 2018
Dec. 31, 2017
Available for sale, amortized cost $ 567,139 $ 538,381
Available for sale, gross unrealized gain 2,512 3,221
Available for sale, gross unrealized loss (9,016) (3,522)
Available for sale, fair value 560,635 538,080
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 58,025 55,567
Available for sale, gross unrealized gain 5 38
Available for sale, gross unrealized loss (777) (249)
Available for sale, fair value 57,252 55,356
Collateralized Mortgage Backed Securities [Member]    
Available for sale, amortized cost 294,582 278,177
Available for sale, gross unrealized gain 609 1,006
Available for sale, gross unrealized loss (6,874) (2,685)
Available for sale, fair value 288,318 276,498
US States and Political Subdivisions Debt Securities [Member]    
Available for sale, amortized cost 123,123 134,641
Available for sale, gross unrealized gain 522 761
Available for sale, gross unrealized loss (856) (553)
Available for sale, fair value 122,789 134,849
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 91,409 69,996
Available for sale, gross unrealized gain 1,376 1,416
Available for sale, gross unrealized loss (509) (35)
Available for sale, fair value $ 92,276 $ 71,377
[1] derived from audited financial statements