INVESTMENT SECURITIES (Details) - USD ($) |
Jun. 30, 2017 |
Dec. 31, 2016 |
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|---|---|---|---|---|---|
| Available-for-sale | |||||
| Amortized Cost | $ 529,750,000 | $ 523,412,000 | |||
| Unrealized Gains | 1,100,000 | 898,000 | |||
| Unrealized Losses | 1,164,000 | 1,576,000 | |||
| Market Value | 529,686,000 | 522,734,000 | |||
| Held to Maturity | |||||
| Amortized Cost | 157,074,000 | 177,365,000 | |||
| Unrealized Gains | 97,000 | 137,000 | |||
| Unrealized Losses | 661,000 | 756,000 | |||
| Market Value | 156,510,000 | 176,746,000 | |||
| Total | |||||
| Amortized Cost | 686,824,000 | 700,777,000 | |||
| Unrealized Gain | 1,197,000 | 1,035,000 | |||
| Unrealized Loss | 1,825,000 | 2,332,000 | |||
| Fair Value | 686,196,000 | 699,480,000 | |||
| U.S. Government Treasury [Member] | |||||
| Available-for-sale | |||||
| Amortized Cost | 277,718,000 | 286,867,000 | |||
| Unrealized Gains | 55,000 | 262,000 | |||
| Unrealized Losses | 808,000 | 851,000 | |||
| Market Value | 276,965,000 | 286,278,000 | |||
| U.S. Government Agency [Member] | |||||
| Available-for-sale | |||||
| Amortized Cost | 142,400,000 | 131,489,000 | |||
| Unrealized Gains | 774,000 | 495,000 | |||
| Unrealized Losses | 280,000 | 344,000 | |||
| Market Value | 142,894,000 | 131,640,000 | |||
| States and Political Subdivisions [Member] | |||||
| Available-for-sale | |||||
| Amortized Cost | 99,899,000 | 95,197,000 | |||
| Unrealized Gains | 155,000 | 23,000 | |||
| Unrealized Losses | 76,000 | 381,000 | |||
| Market Value | 99,978,000 | 94,839,000 | |||
| Mortgage-Backed Securities [Member] | |||||
| Available-for-sale | |||||
| Amortized Cost | 1,246,000 | 1,312,000 | |||
| Unrealized Gains | 116,000 | 118,000 | |||
| Unrealized Losses | 0 | 0 | |||
| Market Value | 1,362,000 | 1,430,000 | |||
| Equity Securities [Member] | |||||
| Available-for-sale | |||||
| Amortized Cost | [1] | 8,487,000 | 8,547,000 | ||
| Unrealized Gains | 0 | 0 | |||
| Unrealized Losses | 0 | 0 | |||
| Market Value | [1] | 8,487,000 | 8,547,000 | ||
| Federal Home Loan Bank | 3,200,000 | 3,300,000 | |||
| Federal Reserve Bank stock | 4,800,000 | 4,800,000 | |||
| FNBB, Inc. stock | 500,000 | 200,000 | |||
| U.S. Government Treasury [Member] | |||||
| Held to Maturity | |||||
| Amortized Cost | 83,246,000 | 119,131,000 | |||
| Unrealized Gains | 1,000 | 107,000 | |||
| Unrealized Losses | 166,000 | 81,000 | |||
| Market Value | 83,081,000 | 119,157,000 | |||
| 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 | 7,351,000 | 8,175,000 | |||
| Unrealized Gains | 25,000 | 1,000 | |||
| Unrealized Losses | 2,000 | 38,000 | |||
| Market Value | 7,374,000 | 8,138,000 | |||
| Mortgage-Backed Securities [Member] | |||||
| Held to Maturity | |||||
| Amortized Cost | 66,477,000 | 50,059,000 | |||
| Unrealized Gains | 71,000 | 29,000 | |||
| Unrealized Losses | 493,000 | 637,000 | |||
| Market Value | $ 66,055,000 | $ 49,451,000 | |||
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