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INVESTMENT SECURITIES (Tables)
3 Months Ended
Mar. 31, 2017
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:
March 31, 2017December 31, 2016
AmortizedUnrealizedUnrealizedMarketAmortizedUnrealizedUnrealizedMarket
CostGainsLossesValueCostGainLossesValue
Available for Sale
U.S. Government Treasury$288,661$106$778$287,989$286,867$262$851$286,278
U.S. Government Agency143,066660293143,433131,489495344131,640
States and Political Subdivisions99,68512611199,70095,1972338194,839
Mortgage-Backed Securities1,275117-1,3921,312118-1,430
Equity Securities(1)8,588--8,5888,547--8,547
Total $541,275$1,009$1,182$541,102$523,412$898$1,576$522,734
Held to Maturity
U.S. Government Treasury$93,335$26$98$93,263$119,131$107$81$119,157
States and Political Subdivisions7,6101747,6238,1751388,138
Mortgage-Backed Securities57,5705862956,99950,0592963749,451
Total $158,515$101$731$157,885$177,365$137$756$176,746
Total Investment Securities$699,790$1,110$1,913$698,987$700,777$1,035$2,332$699,480
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$185,316  $185,386  $35,468  $35,485
Due after one through five years  242,632    241,724    65,477    65,401
Mortgage-Backed Securities1,2751,39257,57056,999
U.S. Government Agency  103,464    104,012    -    -
Equity Securities  8,588    8,588    -    -
Total $541,275  $541,102  $158,515  $157,885
Schedule of investment securities with continuous unrealized loss position
  Less ThanGreater Than
12 Months12 MonthsTotal
MarketUnrealizedMarketUnrealizedMarketUnrealized
(Dollars in Thousands)ValueLossesValueLossesValueLosses
March 31, 2017
Available for Sale
U.S. Government Treasury$133,781  $778  $-  $-  $133,781  $778
U.S. Government Agency$52,628$278$3,871$15$56,499$293
States and Political Subdivisions48,786  109  542  2  49,328  111
Mortgage-Backed Securities  -    -    3    -    3    -
Total 235,195  1,165  4,416  17  239,611  1,182
Held to Maturity
U.S. Government Treasury  47,679  98  -  -  47,679    98
States and Political Subdivisions2,5454--2,5454
Mortgage-Backed Securities  35,437    592    3,404    37    38,841    629
Total $85,661  $694  $3,404  $37  $89,065  $731
December 31, 2016
Available for Sale 
U.S. Government Treasury$116,704  $851  $-  $-  $116,704  $851
U.S. Government Agency48,5203106,6993455,219344
States and Political Subdivisions  81,521    380    294    1    81,815    381
Mortgage-Backed Securities3---3-
Total 246,748  1,541  6,993  35  253,741  1,576
Held to Maturity
U.S. Government Treasury  35,210    81    -    -    35,210    81
States and Political Subdivisions7,49138--7,49138
Mortgage-Backed Securities36,7105994,0103840,720637
Total $79,411  $718  $4,010  $38  $83,421  $756