INVESTMENT SECURITIES (Details) - USD ($) |
Sep. 30, 2018 |
Dec. 31, 2017 |
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|---|---|---|---|---|---|
| Available-for-sale | |||||
| Amortized Cost | $ 488,687,000 | $ 483,048,000 | |||
| Unrealized Gains | 675,000 | 812,000 | |||
| Unrealized Losses | 5,119,000 | 2,949,000 | |||
| Market Value | 484,243,000 | 480,911,000 | |||
| Held to Maturity | |||||
| Amortized Cost | 227,923,000 | 216,679,000 | |||
| Unrealized Gains | 207,000 | 22,000 | |||
| Unrealized Losses | 4,599,000 | 1,694,000 | |||
| Market Value | 223,531,000 | 215,007,000 | |||
| Total | |||||
| Amortized Cost | 716,610,000 | 699,727,000 | |||
| Unrealized Gain | 882,000 | 834,000 | |||
| Unrealized Loss | 9,718,000 | 4,643,000 | |||
| Fair Value | 707,774,000 | 695,918,000 | |||
| U.S. Government Treasury [Member] | |||||
| Available-for-sale | |||||
| Amortized Cost | 272,335,000 | 237,505,000 | |||
| Unrealized Gains | 0 | 0 | |||
| Unrealized Losses | 4,222,000 | 2,164,000 | |||
| Market Value | 268,113,000 | 235,341,000 | |||
| U.S. Government Agency [Member] | |||||
| Available-for-sale | |||||
| Amortized Cost | 153,087,000 | 144,324,000 | |||
| Unrealized Gains | 625,000 | 727,000 | |||
| Unrealized Losses | 621,000 | 407,000 | |||
| Market Value | 153,091,000 | 144,644,000 | |||
| States and Political Subdivisions [Member] | |||||
| Available-for-sale | |||||
| Amortized Cost | 54,115,000 | 91,533,000 | |||
| Unrealized Gains | 0 | 2,000 | |||
| Unrealized Losses | 276,000 | 378,000 | |||
| Market Value | 53,839,000 | 91,157,000 | |||
| Mortgage-Backed Securities [Member] | |||||
| Available-for-sale | |||||
| Amortized Cost | 922,000 | 1,102,000 | |||
| Unrealized Gains | 50,000 | 83,000 | |||
| Unrealized Losses | 0 | 0 | |||
| Market Value | 972,000 | 1,185,000 | |||
| Equity Securities [Member] | |||||
| Available-for-sale | |||||
| Amortized Cost | [1] | 8,228,000 | 8,584,000 | ||
| Unrealized Gains | 0 | 0 | |||
| Unrealized Losses | 0 | 0 | |||
| Market Value | [1] | 8,228,000 | 8,584,000 | ||
| Federal Home Loan Bank | 3,400,000 | 3,100,000 | |||
| Federal Reserve Bank stock | 4,800,000 | 4,800,000 | |||
| FNBB, Inc. stock | 800,000 | ||||
| U.S. Government Treasury [Member] | |||||
| Held to Maturity | |||||
| Amortized Cost | 35,103,000 | 98,256,000 | |||
| Unrealized Gains | 0 | 0 | |||
| Unrealized Losses | 702,000 | 441,000 | |||
| Market Value | 34,401,000 | 97,815,000 | |||
| States and Political Subdivisions [Member] | |||||
| Held to Maturity | |||||
| Amortized Cost | 6,566,000 | 6,996,000 | |||
| Unrealized Gains | 0 | 0 | |||
| Unrealized Losses | 45,000 | 41,000 | |||
| Market Value | 6,521,000 | 6,955,000 | |||
| Mortgage-Backed Securities [Member] | |||||
| Held to Maturity | |||||
| Amortized Cost | 186,254,000 | 111,427,000 | |||
| Unrealized Gains | 207,000 | 22,000 | |||
| Unrealized Losses | 3,852,000 | 1,212,000 | |||
| Market Value | $ 182,609,000 | $ 110,237,000 | |||
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