Quarterly report pursuant to Section 13 or 15(d)

INVESTMENT SECURITIES (Unrealized Losses on Investment Securities) (Details)

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INVESTMENT SECURITIES (Unrealized Losses on Investment Securities) (Details) - USD ($)
Sep. 30, 2018
Dec. 31, 2017
Available-for-sale securities    
Less Than 12 Months, Fair Value $ 190,672,000 $ 284,181,000
Less Than 12 Months, Unrealized Losses 1,520,000 1,433,000
12 Months Or Longer, Fair Value 219,910,000 111,206,000
12 Months Or Longer, Unrealized Losses 3,599,000 1,516,000
Total Fair Value 410,582,000 395,387,000
Total Unrealized Losses 5,119,000 2,949,000
Held-to-maturity debt securities    
Less Than 12 Months, Fair Value 101,442,000 140,846,000
Less Than 12 Months, Unrealized Losses 1,648,000 808,000
12 Months Or Longer, Fair Value 85,085,000 45,155,000
12 Months Or Longer, Unrealized Losses 2,951,000 886,000
Total Fair Value 186,527,000 186,001,000
Total Unrealized Losses 4,599,000 1,694,000
U.S. Government Treasury [Member]    
Available-for-sale securities    
Less Than 12 Months, Fair Value 92,259,000 155,443,000
Less Than 12 Months, Unrealized Losses 1,005,000 963,000
12 Months Or Longer, Fair Value 175,854,000 79,900,000
12 Months Or Longer, Unrealized Losses 3,217,000 1,201,000
Total Fair Value 268,113,000 235,343,000
Total Unrealized Losses 4,222,000 2,164,000
U.S. Government Agency [Member]    
Available-for-sale securities    
Less Than 12 Months, Fair Value 63,475,000 45,737,000
Less Than 12 Months, Unrealized Losses 351,000 150,000
12 Months Or Longer, Fair Value 29,223,000 25,757,000
12 Months Or Longer, Unrealized Losses 270,000 257,000
Total Fair Value 92,698,000 71,494,000
Total Unrealized Losses 621,000 407,000
States and Political Subdivisions [Member]    
Available-for-sale securities    
Less Than 12 Months, Fair Value 34,928,000 82,999,000
Less Than 12 Months, Unrealized Losses 164,000 320,000
12 Months Or Longer, Fair Value 14,831,000 5,549,000
12 Months Or Longer, Unrealized Losses 112,000 58,000
Total Fair Value 49,759,000 88,548,000
Total Unrealized Losses 276,000 378,000
Mortgage-Backed Securities [Member]    
Available-for-sale securities    
Less Than 12 Months, Fair Value 10,000 2,000
Less Than 12 Months, Unrealized Losses 0 0
12 Months Or Longer, Fair Value 2,000 0
12 Months Or Longer, Unrealized Losses 0 0
Total Fair Value 12,000 2,000
Total Unrealized Losses 0 0
U.S. Government Treasury [Member]    
Held-to-maturity debt securities    
Less Than 12 Months, Fair Value 4,900,000 77,861,000
Less Than 12 Months, Unrealized Losses 112,000 298,000
12 Months Or Longer, Fair Value 29,501,000 14,939,000
12 Months Or Longer, Unrealized Losses 590,000 143,000
Total Fair Value 34,401,000 92,800,000
Total Unrealized Losses 702,000 441,000
States and Political Subdivisions [Member]    
Held-to-maturity debt securities    
Less Than 12 Months, Fair Value 6,026,000 6,955,000
Less Than 12 Months, Unrealized Losses 38,000 41,000
12 Months Or Longer, Fair Value 495,000 0
12 Months Or Longer, Unrealized Losses 7,000 0
Total Fair Value 6,521,000 6,955,000
Total Unrealized Losses 45,000 41,000
Mortgage-Backed Securities [Member]    
Held-to-maturity debt securities    
Less Than 12 Months, Fair Value 90,516,000 56,030,000
Less Than 12 Months, Unrealized Losses 1,498,000 469,000
12 Months Or Longer, Fair Value 55,089,000 30,216,000
12 Months Or Longer, Unrealized Losses 2,354,000 743,000
Total Fair Value 145,605,000 86,246,000
Total Unrealized Losses $ 3,852,000 $ 1,212,000