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
Jun. 30, 2019
Dec. 31, 2018
Available for sale, amortized cost $ 652,557 $ 596,225
Available for sale, gross unrealized gain 5,985 1,545
Available for sale, gross unrealized loss (571) (7,586)
Available for sale, fair value 657,971 590,184
Held to maturity, amortized cost 250  
Held to maturity, gross unrealized gain 0  
Held to maturity, gross unrealized loss 0  
Held to maturity debt securities, fair value 250 0
US Treasury and Government [Member]    
Available for sale, amortized cost 74,342 77,534
Available for sale, gross unrealized gain 396 78
Available for sale, gross unrealized loss (31) (619)
Available for sale, fair value 74,707 76,993
Collateralized Mortgage Backed Securities [Member]    
Available for sale, amortized cost 360,816 309,244
Available for sale, gross unrealized gain 3,072 591
Available for sale, gross unrealized loss (463) (5,531)
Available for sale, fair value 363,425 304,304
US States and Political Subdivisions Debt Securities [Member]    
Available for sale, amortized cost 83,984 106,465
Available for sale, gross unrealized gain 387 208
Available for sale, gross unrealized loss (60) (679)
Available for sale, fair value 84,311 105,994
Held to maturity, amortized cost 250  
Held to maturity, gross unrealized gain 0  
Held to maturity, gross unrealized loss 0  
Held to maturity debt securities, fair value 250  
Corporate Debt Securities [Member]    
Available for sale, amortized cost 133,415 102,982
Available for sale, gross unrealized gain 2,130 668
Available for sale, gross unrealized loss (17) (757)
Available for sale, fair value $ 135,528 $ 102,893