INVESTMENT SECURITIES (Details) - USD ($) |
Jun. 30, 2018 |
Dec. 31, 2017 |
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|---|---|---|---|---|---|
| Available-for-sale | |||||
| Amortized Cost | $ 497,551,000 | $ 483,048,000 | |||
| Unrealized Gains | 727,000 | 812,000 | |||
| Unrealized Losses | 4,616,000 | 2,949,000 | |||
| Market Value | 493,662,000 | 480,911,000 | |||
| Held to Maturity | |||||
| Amortized Cost | 236,764,000 | 216,679,000 | |||
| Unrealized Gains | 165,000 | 22,000 | |||
| Unrealized Losses | 3,750,000 | 1,694,000 | |||
| Market Value | 233,179,000 | 215,007,000 | |||
| Total | |||||
| Amortized Cost | 734,315,000 | 699,727,000 | |||
| Unrealized Gain | 892,000 | 834,000 | |||
| Unrealized Loss | 8,366,000 | 4,643,000 | |||
| Fair Value | 726,841,000 | 695,918,000 | |||
| U.S. Government Treasury [Member] | |||||
| Available-for-sale | |||||
| Amortized Cost | 262,471,000 | 237,505,000 | |||
| Unrealized Gains | 12,000 | 0 | |||
| Unrealized Losses | 3,745,000 | 2,164,000 | |||
| Market Value | 258,738,000 | 235,341,000 | |||
| U.S. Government Agency [Member] | |||||
| Available-for-sale | |||||
| Amortized Cost | 159,906,000 | 144,324,000 | |||
| Unrealized Gains | 656,000 | 727,000 | |||
| Unrealized Losses | 653,000 | 407,000 | |||
| Market Value | 159,909,000 | 144,644,000 | |||
| States and Political Subdivisions [Member] | |||||
| Available-for-sale | |||||
| Amortized Cost | 66,348,000 | 91,533,000 | |||
| Unrealized Gains | 1,000 | 2,000 | |||
| Unrealized Losses | 218,000 | 378,000 | |||
| Market Value | 66,131,000 | 91,157,000 | |||
| Mortgage-Backed Securities [Member] | |||||
| Available-for-sale | |||||
| Amortized Cost | 940,000 | 1,102,000 | |||
| Unrealized Gains | 58,000 | 83,000 | |||
| Unrealized Losses | 0 | 0 | |||
| Market Value | 998,000 | 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 | 50,124,000 | 98,256,000 | |||
| Unrealized Gains | 0 | 0 | |||
| Unrealized Losses | 668,000 | 441,000 | |||
| Market Value | 49,456,000 | 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 | 6,621,000 | 6,996,000 | |||
| Unrealized Gains | 0 | 0 | |||
| Unrealized Losses | 32,000 | 41,000 | |||
| Market Value | 6,589,000 | 6,955,000 | |||
| Mortgage-Backed Securities [Member] | |||||
| Held to Maturity | |||||
| Amortized Cost | 180,019,000 | 111,427,000 | |||
| Unrealized Gains | 165,000 | 22,000 | |||
| Unrealized Losses | 3,050,000 | 1,212,000 | |||
| Market Value | $ 177,134,000 | $ 110,237,000 | |||
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