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INVESTMENT SECURITIES (Tables)
6 Months Ended
Jun. 30, 2019
Investments, Debt and Equity Securities [Abstract]  
Schedule of amortized cost and related market value of investment securities available-for-sale
Investment Portfolio Composition. The amortized cost and related market value of investment securities available-for-sale and
held-to-maturity were as follows:
June 30, 2019December 31, 2018
AmortizedUnrealizedUnrealizedMarketAmortizedUnrealizedUnrealizedMarket
CostGainsLossesValueCostGainLossesValue
Available for Sale
U.S. Government Treasury$241,731$908$616$242,023$264,298$167$2,616$261,849
U.S. Government Agency138,046476395138,127133,201520515133,206
States and Political Subdivisions22,0678922,06642,509-14442,365
Mortgage-Backed Securities72365-78890340-943
Equity Securities(1)7,847--7,8477,794--7,794
Total $410,414$1,457$1,020$410,851$448,705$727$3,275$446,157
Held to Maturity
U.S. Government Treasury$35,062$7$96$34,973$35,088$-$477$34,611
States and Political Subdivisions4,833134,8316,512-266,486
Mortgage-Backed Securities189,6211,614349190,886175,7202202,624173,316
Total $229,516$1,622$448$230,690$217,320$220$3,127$214,413
Total Investment Securities$639,930$3,079$1,468$641,541$666,025$947$6,402$660,570
Schedule of investment securities with maturity distribution based on contractual maturities
Available for SaleHeld to Maturity
(Dollars in Thousands)Amortized CostMarket ValueAmortized CostMarket Value
Due in one year or less$148,151  $147,738  $19,840  $19,800
Due after one year through five years  130,952    131,635    20,055    20,004
Mortgage-Backed Securities723788189,621190,886
U.S. Government Agency  122,741    122,843    -    -
Equity Securities  7,847    7,847    -    -
Total $410,414  $410,851  $229,516  $230,690
Schedule of investment securities with continuous unrealized loss position
  Less ThanGreater Than
12 Months12 MonthsTotal
MarketUnrealizedMarketUnrealizedMarketUnrealized
(Dollars in Thousands)ValueLossesValueLossesValueLosses
June 30, 2019
Available for Sale
U.S. Government Treasury$-  $-  $167,884  $616  $167,884  $616
U.S. Government Agency32,60017542,90822075,508395
States and Political Subdivisions-  -  11,369  9  11,369  9
Total 32,600  175  222,161  845  254,761  1,020
Held to Maturity
U.S. Government Treasury  -  -  29,958  96  29,958    96
States and Political Subdivisions--2,88032,8803
Mortgage-Backed Securities  4,929    32    47,910    317    52,839    349
Total $4,929  $32  $80,748  $416  $85,677  $448
December 31, 2018
Available for Sale 
U.S. Government Treasury$28,420  $80  $193,501  $2,536  $221,921  $2,616
U.S. Government Agency53,23727128,73524481,972515
States and Political Subdivisions  8,243    12    31,417    132    39,660    144
Mortgage-Backed Securities10---10-
Total 89,910  363  253,653  2,912  343,563  3,275
Held to Maturity
U.S. Government Treasury  -    -    34,612    477    34,612    477
States and Political Subdivisions204-6,281266,48526
Mortgage-Backed Securities51,32738984,7052,235136,0322,624
Total $51,531  $389  $125,598  $2,738  $177,129  $3,127