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FAIR VALUES OF FINANCIAL INSTRUMENTS: (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Fair value measurement |  |
Securities available-for-sale | $ 784,916 | $ 814,931
U.S. Government entity mortgage-backed securities |  |
Fair value measurement |  |
Securities available-for-sale | 25,364 | 13,695
Mortgage-backed securities, residential |  |
Fair value measurement |  |
Securities available-for-sale | 178,743 | 215,338
Mortgage-backed securities, commercial |  |
Fair value measurement |  |
Securities available-for-sale | 0 | 1
Collateralized mortgage obligations |  |
Fair value measurement |  |
Securities available-for-sale | 343,616 | 339,670
State and municipal obligations |  |
Fair value measurement |  |
Securities available-for-sale | 233,935 | 231,622
Collateralized debt obligations |  |
Fair value measurement |  |
Securities available-for-sale | 3,258 | 14,605
Level 1 |  |
Fair value measurement |  |
Securities available-for-sale | 0 | 0
Level 2 |  |
Fair value measurement |  |
Securities available-for-sale | 778,523 | 796,646
Derivative Assets | 218 | 298
Derivative Liabilities | (218) | (298)
Level 2 | U.S. Government entity mortgage-backed securities |  |
Fair value measurement |  |
Securities available-for-sale | 25,364 | 13,695
Level 2 | Mortgage-backed securities, residential |  |
Fair value measurement |  |
Securities available-for-sale | 178,743 | 215,338
Level 2 | Mortgage-backed securities, commercial |  |
Fair value measurement |  |
Securities available-for-sale | 0 | 1
Level 2 | Collateralized mortgage obligations |  |
Fair value measurement |  |
Securities available-for-sale | 343,616 | 339,670
Level 2 | State and municipal obligations |  |
Fair value measurement |  |
Securities available-for-sale | 230,800 | 227,942
Level 3 |  |
Fair value measurement |  |
Securities available-for-sale | 6,393 | 18,285
Level 3 | State and municipal obligations |  |
Fair value measurement |  |
Securities available-for-sale | 3,135 | 3,680
Level 3 | Collateralized debt obligations |  |
Fair value measurement |  |
Securities available-for-sale | $ 3,258 | $ 14,605

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