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NOTE 2 - INVESTMENT SECURITIES - Amortized Cost and Fair Value of Investment Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Securities held to maturity:    
Securities held to maturity, at amortized cost $ 395,302 $ 401,913
Securities held to maturity, gross unrealized gains 13,126 5,661
Securities held to maturity, gross unrealized (losses) (2,057) (6,804)
Securities held to maturity, fair value 406,371 400,770
Securities available for sale:    
Securities available for sale, amortized Cost 261,918 266,671
Securities available for sale, gross unrealized gains 1,163 501
Securities available for sale, gross unrealized (losses) (2,634) (6,116)
Securities available for sale, fair value 260,447 261,056
US States and Political Subdivisions Debt Securities    
Securities held to maturity:    
Securities held to maturity, at amortized cost 394,252 400,863
Securities held to maturity, gross unrealized gains 13,126 5,661
Securities held to maturity, gross unrealized (losses) (2,056) (6,803)
Securities held to maturity, fair value 405,322 399,721
Securities available for sale:    
Securities available for sale, amortized Cost 55,585 59,069
Securities available for sale, gross unrealized gains 649 180
Securities available for sale, gross unrealized (losses) (110) (703)
Securities available for sale, fair value 56,124 58,546
US Government Agencies Debt Securities    
Securities available for sale:    
Securities available for sale, amortized Cost 36,141 37,150
Securities available for sale, gross unrealized gains 89 39
Securities available for sale, gross unrealized (losses) (387) (778)
Securities available for sale, fair value 35,843 36,411
Residential Mortgage Backed Securities    
Securities available for sale:    
Securities available for sale, amortized Cost 163,438 163,698
Securities available for sale, gross unrealized gains 351 182
Securities available for sale, gross unrealized (losses) (2,097) (4,631)
Securities available for sale, fair value 161,692 159,249
Other Securities    
Securities held to maturity:    
Securities held to maturity, at amortized cost 1,050 1,050
Securities held to maturity, gross unrealized (losses) (1) (1)
Securities held to maturity, fair value 1,049 1,049
Securities available for sale:    
Securities available for sale, amortized Cost 6,754 6,754
Securities available for sale, gross unrealized gains 74 100
Securities available for sale, gross unrealized (losses) (40) (4)
Securities available for sale, fair value $ 6,788 $ 6,850