INVESTMENT SECURITIES (Details) - USD ($) |
Mar. 31, 2017 |
Dec. 31, 2016 |
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|---|---|---|---|---|---|
| Available-for-sale | |||||
| Amortized Cost | $ 541,275,000 | $ 523,412,000 | |||
| Unrealized Gains | 1,009,000 | 898,000 | |||
| Unrealized Losses | 1,182,000 | 1,576,000 | |||
| Market Value | 541,102,000 | 522,734,000 | |||
| Held to Maturity | |||||
| Amortized Cost | 158,515,000 | 177,365,000 | |||
| Unrealized Gains | 101,000 | 137,000 | |||
| Unrealized Losses | 731,000 | 756,000 | |||
| Market Value | 157,885,000 | 176,746,000 | |||
| Total | |||||
| Amortized Cost | 699,790,000 | 700,777,000 | |||
| Unrealized Gain | 1,110,000 | 1,035,000 | |||
| Unrealized Loss | 1,913,000 | 2,332,000 | |||
| Fair Value | 698,987,000 | 699,480,000 | |||
| U.S. Government Treasury [Member] | |||||
| Available-for-sale | |||||
| Amortized Cost | 288,661,000 | 286,867,000 | |||
| Unrealized Gains | 106,000 | 262,000 | |||
| Unrealized Losses | 778,000 | 851,000 | |||
| Market Value | 287,989,000 | 286,278,000 | |||
| U.S. Government Agency [Member] | |||||
| Available-for-sale | |||||
| Amortized Cost | 143,066,000 | 131,489,000 | |||
| Unrealized Gains | 660,000 | 495,000 | |||
| Unrealized Losses | 293,000 | 344,000 | |||
| Market Value | 143,433,000 | 131,640,000 | |||
| States and Political Subdivisions [Member] | |||||
| Available-for-sale | |||||
| Amortized Cost | 99,685,000 | 95,197,000 | |||
| Unrealized Gains | 126,000 | 23,000 | |||
| Unrealized Losses | 111,000 | 381,000 | |||
| Market Value | 99,700,000 | 94,839,000 | |||
| Mortgage-Backed Securities [Member] | |||||
| Available-for-sale | |||||
| Amortized Cost | 1,275,000 | 1,312,000 | |||
| Unrealized Gains | 117,000 | 118,000 | |||
| Unrealized Losses | 0 | 0 | |||
| Market Value | 1,392,000 | 1,430,000 | |||
| Equity Securities [Member] | |||||
| Available-for-sale | |||||
| Amortized Cost | [1] | 8,588,000 | 8,547,000 | ||
| Unrealized Gains | 0 | 0 | |||
| Unrealized Losses | 0 | 0 | |||
| Market Value | [1] | 8,588,000 | 8,547,000 | ||
| Federal Home Loan Bank | 3,300,000 | 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 | 93,335,000 | 119,131,000 | |||
| Unrealized Gains | 26,000 | 107,000 | |||
| Unrealized Losses | 98,000 | 81,000 | |||
| Market Value | 93,263,000 | 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 | 7,610,000 | 8,175,000 | |||
| Unrealized Gains | 17,000 | 1,000 | |||
| Unrealized Losses | 4,000 | 38,000 | |||
| Market Value | 7,623,000 | 8,138,000 | |||
| Mortgage-Backed Securities [Member] | |||||
| Held to Maturity | |||||
| Amortized Cost | 57,570,000 | 50,059,000 | |||
| Unrealized Gains | 58,000 | 29,000 | |||
| Unrealized Losses | 629,000 | 637,000 | |||
| Market Value | $ 56,999,000 | $ 49,451,000 | |||
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