INVESTMENT SECURITIES (Details) - USD ($) |
Sep. 30, 2016 |
Dec. 31, 2015 |
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|---|---|---|---|---|---|
| Available-for-sale | |||||
| Amortized Cost | $ 498,458,000 | $ 450,883,000 | |||
| Unrealized Gains | 1,929,000 | 720,000 | |||
| Unrealized Losses | 248,000 | 575,000 | |||
| Market Value | 500,139,000 | 451,028,000 | |||
| Held to Maturity | |||||
| Amortized Cost | 189,928,000 | 187,892,000 | |||
| Unrealized Gains | 966,000 | 94,000 | |||
| Unrealized Losses | 65,000 | 579,000 | |||
| Market Value | 190,829,000 | 187,407,000 | |||
| Total | |||||
| Amortized Cost | 688,386,000 | 638,775,000 | |||
| Unrealized Gain | 2,895,000 | 814,000 | |||
| Unrealized Loss | 313,000 | 1,154,000 | |||
| Fair Value | 690,968,000 | 638,435,000 | |||
| U.S. Government Treasury [Member] | |||||
| Available-for-sale | |||||
| Amortized Cost | 272,656,000 | 250,458,000 | |||
| Unrealized Gains | 1,029,000 | 101,000 | |||
| Unrealized Losses | 0 | 213,000 | |||
| Market Value | 273,685,000 | 250,346,000 | |||
| U.S. Government Agency [Member] | |||||
| Available-for-sale | |||||
| Amortized Cost | 129,150,000 | 101,730,000 | |||
| Unrealized Gains | 569,000 | 357,000 | |||
| Unrealized Losses | 203,000 | 263,000 | |||
| Market Value | 129,516,000 | 101,824,000 | |||
| States and Political Subdivisions [Member] | |||||
| Available-for-sale | |||||
| Amortized Cost | 86,490,000 | 88,358,000 | |||
| Unrealized Gains | 189,000 | 103,000 | |||
| Unrealized Losses | 45,000 | 99,000 | |||
| Market Value | 86,634,000 | 88,362,000 | |||
| Mortgage-Backed Securities [Member] | |||||
| Available-for-sale | |||||
| Amortized Cost | 1,340,000 | 1,742,000 | |||
| Unrealized Gains | 142,000 | 159,000 | |||
| Unrealized Losses | 0 | 0 | |||
| Market Value | 1,482,000 | 1,901,000 | |||
| Equity Securities [Member] | |||||
| Available-for-sale | |||||
| Amortized Cost | [1] | 8,822,000 | 8,595,000 | ||
| Unrealized Gains | 0 | 0 | |||
| Unrealized Losses | 0 | 0 | |||
| Market Value | [1] | 8,822,000 | 8,595,000 | ||
| Federal Home Loan Bank | 3,500,000 | 3,600,000 | |||
| 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 | 129,323,000 | 134,554,000 | |||
| Unrealized Gains | 530,000 | 45,000 | |||
| Unrealized Losses | 0 | 160,000 | |||
| Market Value | 129,853,000 | 134,439,000 | |||
| U.S. Government Agency [Member] | |||||
| Held to Maturity | |||||
| Amortized Cost | 1,904,000 | 10,043,000 | |||
| Unrealized Gains | 1,000 | 7,000 | |||
| Unrealized Losses | 0 | 5,000 | |||
| Market Value | 1,905,000 | 10,045,000 | |||
| States and Political Subdivisions [Member] | |||||
| Held to Maturity | |||||
| Amortized Cost | 9,983,000 | 15,693,000 | |||
| Unrealized Gains | 69,000 | 38,000 | |||
| Unrealized Losses | 1,000 | 7,000 | |||
| Market Value | 10,051,000 | 15,724,000 | |||
| Mortgage-Backed Securities [Member] | |||||
| Held to Maturity | |||||
| Amortized Cost | 48,718,000 | 27,602,000 | |||
| Unrealized Gains | 366,000 | 4,000 | |||
| Unrealized Losses | 64,000 | 407,000 | |||
| Market Value | $ 49,020,000 | $ 27,199,000 | |||
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