Quarterly report pursuant to Section 13 or 15(d)

Note 4 - Securities - Amortized Cost and Fair Value of Contractual Securities (Details)

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Note 4 - Securities - Amortized Cost and Fair Value of Contractual Securities (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Available for sale, amortized cost $ 590,445 $ 538,381
Available for sale, fair value 578,021 538,080
Held to maturity, amortized cost 250 250
Held to maturity debt securities, fair value 250 250 [1]
Due Within One Year [Member]    
Available for sale, amortized cost 49,809 22,122
Available for sale, fair value 49,722 22,172
Due from One to Five Years [Member]    
Available for sale, amortized cost 213,202 160,773
Available for sale, fair value 210,472 160,563
Held to maturity, amortized cost 250 250
Held to maturity debt securities, fair value 250 250
Due from Five to Ten Years [Member]    
Available for sale, amortized cost 17,141 73,362
Available for sale, fair value 17,106 74,684
Due After Ten Years [Member]    
Available for sale, amortized cost 1,854 3,947
Available for sale, fair value 1,897 4,163
Collateralized Mortgage Backed Securities [Member]    
Available for sale, amortized cost 308,439 278,177
Available for sale, fair value $ 298,824 $ 276,498
[1] Derived from audited financial statements.