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, 2017
Dec. 31, 2016
Available-for-sale securities    
Less Than 12 Months, Fair Value $ 249,526,000 $ 246,748,000
Less Than 12 Months, Unrealized Losses 907,000 1,541,000
12 Months Or Longer, Fair Value 32,963,000 6,993,000
12 Months Or Longer, Unrealized Losses 306,000 35,000
Total Fair Value 282,489,000 253,741,000
Total Unrealized Losses 1,213,000 1,576,000
Held-to-maturity debt securities    
Less Than 12 Months, Fair Value 130,836,000 79,411,000
Less Than 12 Months, Unrealized Losses 764,000 718,000
12 Months Or Longer, Fair Value 4,373,000 4,010,000
12 Months Or Longer, Unrealized Losses 63,000 38,000
Total Fair Value 135,209,000 83,421,000
Total Unrealized Losses 827,000 756,000
U.S. Government Treasury [Member]    
Available-for-sale securities    
Less Than 12 Months, Fair Value 191,720,000 116,704,000
Less Than 12 Months, Unrealized Losses 759,000 851,000
12 Months Or Longer, Fair Value 9,981,000 0
12 Months Or Longer, Unrealized Losses 110,000 0
Total Fair Value 201,701,000 116,704,000
Total Unrealized Losses 869,000 851,000
U.S. Government Agency [Member]    
Available-for-sale securities    
Less Than 12 Months, Fair Value 34,775,000 48,520,000
Less Than 12 Months, Unrealized Losses 126,000 310,000
12 Months Or Longer, Fair Value 17,853,000 6,699,000
12 Months Or Longer, Unrealized Losses 164,000 34,000
Total Fair Value 52,628,000 55,219,000
Total Unrealized Losses 290,000 344,000
States and Political Subdivisions [Member]    
Available-for-sale securities    
Less Than 12 Months, Fair Value 23,031,000 81,521,000
Less Than 12 Months, Unrealized Losses 22,000 380,000
12 Months Or Longer, Fair Value 5,129,000 294,000
12 Months Or Longer, Unrealized Losses 32,000 1,000
Total Fair Value 28,160,000 81,815,000
Total Unrealized Losses 54,000 381,000
Mortgage-Backed Securities [Member]    
Available-for-sale securities    
Less Than 12 Months, Fair Value 0 3,000
Less Than 12 Months, Unrealized Losses 0 0
12 Months Or Longer, Fair Value 0 0
12 Months Or Longer, Unrealized Losses 0 0
Total Fair Value 0 3,000
Total Unrealized Losses 0 0
U.S. Government Treasury [Member]    
Held-to-maturity debt securities    
Less Than 12 Months, Fair Value 83,173,000 35,210,000
Less Than 12 Months, Unrealized Losses 183,000 81,000
12 Months Or Longer, Fair Value 0 0
12 Months Or Longer, Unrealized Losses 0 0
Total Fair Value 83,173,000 35,210,000
Total Unrealized Losses 183,000 81,000
U.S. Government Agency [Member]    
Held-to-maturity debt securities    
Less Than 12 Months, Fair Value 0 0
Less Than 12 Months, Unrealized Losses 0 0
12 Months Or Longer, Fair Value 0 0
12 Months Or Longer, Unrealized Losses 0 0
Total Fair Value 0 0
Total Unrealized Losses 0 0
States and Political Subdivisions [Member]    
Held-to-maturity debt securities    
Less Than 12 Months, Fair Value 504,000 7,491,000
Less Than 12 Months, Unrealized Losses 2,000 38,000
12 Months Or Longer, Fair Value 0 0
12 Months Or Longer, Unrealized Losses 0 0
Total Fair Value 504,000 7,491,000
Total Unrealized Losses 2,000 38,000
Mortgage-Backed Securities [Member]    
Held-to-maturity debt securities    
Less Than 12 Months, Fair Value 47,159,000 36,710,000
Less Than 12 Months, Unrealized Losses 579,000 599,000
12 Months Or Longer, Fair Value 4,373,000 4,010,000
12 Months Or Longer, Unrealized Losses 63,000 38,000
Total Fair Value 51,532,000 40,720,000
Total Unrealized Losses $ 642,000 $ 637,000