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, 2019
Dec. 31, 2018
Available for sale, amortized cost $ 632,969 $ 596,225
Available for sale, gross unrealized gain 2,306 1,545
Available for sale, gross unrealized loss (3,579) (7,586)
Available for sale, fair value 631,696 590,184 [1]
Held to maturity, amortized cost 250  
Held to maturity, gross unrealized gain  
Held to maturity, gross unrealized loss  
Held to maturity debt securities, fair value 250 [2]
US Treasury and Government [Member]    
Available for sale, amortized cost 74,285 77,534
Available for sale, gross unrealized gain 126 78
Available for sale, gross unrealized loss (330) (619)
Available for sale, fair value 74,081 76,993
Collateralized Mortgage Backed Securities [Member]    
Available for sale, amortized cost 330,444 309,244
Available for sale, gross unrealized gain 1,392 591
Available for sale, gross unrealized loss (2,460) (5,531)
Available for sale, fair value 329,376 304,304
US States and Political Subdivisions Debt Securities [Member]    
Available for sale, amortized cost 96,438 106,465
Available for sale, gross unrealized gain 280 208
Available for sale, gross unrealized loss (250) (679)
Available for sale, fair value 96,468 105,994
Held to maturity, amortized cost 250  
Held to maturity, gross unrealized gain  
Held to maturity, gross unrealized loss  
Held to maturity debt securities, fair value 250  
Corporate Debt Securities [Member]    
Available for sale, amortized cost 131,802 102,982
Available for sale, gross unrealized gain 508 668
Available for sale, gross unrealized loss (539) (757)
Available for sale, fair value $ 131,771 $ 102,893
[1] Derived from audited financial statements.
[2] Derived from audited financial statements.