INVESTMENT SECURITIES (Details) - USD ($) |
Mar. 31, 2018 |
Dec. 31, 2017 |
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|---|---|---|---|---|---|
| Available-for-sale | |||||
| Amortized Cost | $ 475,461,000 | $ 483,048,000 | |||
| Unrealized Gains | 749,000 | 812,000 | |||
| Unrealized Losses | 4,374,000 | 2,949,000 | |||
| Market Value | 471,836,000 | 480,911,000 | |||
| Held to Maturity | |||||
| Amortized Cost | 225,552,000 | 216,679,000 | |||
| Unrealized Gains | 39,000 | 22,000 | |||
| Unrealized Losses | 3,381,000 | 1,694,000 | |||
| Market Value | 222,210,000 | 215,007,000 | |||
| Total | |||||
| Amortized Cost | 701,013,000 | 699,727,000 | |||
| Unrealized Gain | 788,000 | 834,000 | |||
| Unrealized Loss | 7,755,000 | 4,643,000 | |||
| Fair Value | 694,046,000 | 695,918,000 | |||
| U.S. Government Treasury [Member] | |||||
| Available-for-sale | |||||
| Amortized Cost | 240,933,000 | 237,505,000 | |||
| Unrealized Gains | 5,000 | 0 | |||
| Unrealized Losses | 3,361,000 | 2,164,000 | |||
| Market Value | 237,577,000 | 235,341,000 | |||
| U.S. Government Agency [Member] | |||||
| Available-for-sale | |||||
| Amortized Cost | 149,074,000 | 144,324,000 | |||
| Unrealized Gains | 667,000 | 727,000 | |||
| Unrealized Losses | 670,000 | 407,000 | |||
| Market Value | 149,071,000 | 144,644,000 | |||
| States and Political Subdivisions [Member] | |||||
| Available-for-sale | |||||
| Amortized Cost | 76,486,000 | 91,533,000 | |||
| Unrealized Gains | 0 | 2,000 | |||
| Unrealized Losses | 343,000 | 378,000 | |||
| Market Value | 76,143,000 | 91,157,000 | |||
| Mortgage-Backed Securities [Member] | |||||
| Available-for-sale | |||||
| Amortized Cost | 1,082,000 | 1,102,000 | |||
| Unrealized Gains | 77,000 | 83,000 | |||
| Unrealized Losses | 0 | 0 | |||
| Market Value | 1,159,000 | 1,185,000 | |||
| Equity Securities [Member] | |||||
| Available-for-sale | |||||
| Amortized Cost | [1] | 7,886,000 | 8,584,000 | ||
| Unrealized Gains | 0 | 0 | |||
| Unrealized Losses | 0 | 0 | |||
| Market Value | [1] | 7,886,000 | 8,584,000 | ||
| Federal Home Loan Bank | 3,100,000 | 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 | 78,184,000 | 98,256,000 | |||
| Unrealized Gains | 0 | 0 | |||
| Unrealized Losses | 664,000 | 441,000 | |||
| Market Value | 77,520,000 | 97,815,000 | |||
| U.S. Government Agency [Member] | |||||
| Held to Maturity | |||||
| Amortized Cost | 0 | 0 | |||
| Unrealized Gains | 0 | 0 | |||
| Unrealized Losses | 0 | 0 | |||
| Market Value | 0 | 0 | |||
| States and Political Subdivisions [Member] | |||||
| Held to Maturity | |||||
| Amortized Cost | 6,940,000 | 6,996,000 | |||
| Unrealized Gains | 0 | 0 | |||
| Unrealized Losses | 42,000 | 41,000 | |||
| Market Value | 6,898,000 | 6,955,000 | |||
| Mortgage-Backed Securities [Member] | |||||
| Held to Maturity | |||||
| Amortized Cost | 140,428,000 | 111,427,000 | |||
| Unrealized Gains | 39,000 | 22,000 | |||
| Unrealized Losses | 2,675,000 | 1,212,000 | |||
| Market Value | $ 137,792,000 | $ 110,237,000 | |||
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