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INVESTMENT SECURITIES (Tables)
6 Months Ended
Jun. 30, 2016
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, 2016December 31, 2015
AmortizedUnrealizedUnrealizedMarketAmortizedUnrealizedUnrealizedMarket
CostGainsLossesValueCostGainLossesValue
Available for Sale
U.S. Government Treasury$272,847$1,672$1$274,518$250,458$101$213$250,346
U.S. Government Agency112,38661886112,918101,730357263101,824
States and Political Subdivisions87,391498287,88788,3581039988,362
Mortgage-Backed Securities1,385139-1,5241,742159-1,901
Equity Securities(1)9,001--9,0018,595--8,595
Total $483,010$2,927$89$485,848$450,883$720$575$451,028
Held to Maturity
U.S. Government Treasury$144,453$890$-$145,343$134,554$45$160$134,439
U.S. Government Agency8,0108-8,01810,0437510,045
States and Political Subdivisions11,384110-11,49415,69338715,724
Mortgage-Backed Securities40,6272079440,74027,602440727,199
Total $204,474$1,215$94$205,595$187,892$94$579$187,407
Total Investment Securities$687,484$4,142$183$691,443$638,775$814$1,154$638,435
Schedule of investment securities with maturity distribution based on contractual maturities
Available for SaleHeld to Maturity
Amortized  Market   Amortized  Market
(Dollars in Thousands)CostValueCostValue
Due in one year or less$107,601  $107,815  $82,698  $82,851
Due after one through five years  283,434    285,559    81,149    82,004
Mortgage-Backed Securities1,3851,52440,62740,740
U.S. Government Agency  81,589    81,949    -    -
Equity Securities  9,001    9,001    -    -
Total $483,010  $485,848  $204,474  $205,595
Schedule of investment securities with continuous unrealized loss position
  Less ThanGreater Than
12 Months12 MonthsTotal
MarketUnrealizedMarketUnrealizedMarketUnrealized
(Dollars in Thousands)ValueLossesValueLossesValueLosses
June 30, 2016
Available for Sale
U.S. Government Treasury$9,955  $1  $-  $-  $9,955  $1
U.S. Government Agency13,8155210,5053424,32086
States and Political Subdivisions3,135  2  302  -  3,437  2
Total 26,905  55  10,807  34  37,712  89
Held to Maturity
Mortgage-Backed Securities  1,189    1    8,006    93    9,195    94
Total $1,189  $1  $8,006  $93  $9,195  $94
December 31, 2015
Available for Sale 
U.S. Government Treasury$150,061  $213  $-  $-  $150,061  $213
U.S. Government Agency43,5082009,6446353,152263
States and Political Subdivisions  39,608    86    5,066    13    44,674    99
Total 233,177  499  14,710  76  247,887  575
Held to Maturity
U.S. Government Treasury  92,339    160    -    -    92,339    160
U.S. Government Agency5,0065--5,0065
States and Political Subdivisions3,7917--3,7917
Mortgage-Backed Securities13,26718511,88922222,156407
Total $114,403  $357  $11,889  $222  $126,292  $579