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FAIR VALUES OF FINANCIAL INSTRUMENTS: (Details 4) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | --- | ---
Carrying amount and estimated fair value of financial instruments |  |  |  |
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held | $ 2,974 | $ 2,974 | $ 2,974 | $ 7,132
Securities available-for-sale | 1,020,744 | 926,717 |  |
Restricted stock | 14,812 | 15,394 |  |
Accrued interest receivable | 16,957 | 18,523 |  |
Deposits | (3,755,945) | (3,275,357) |  |
Level 1 |  |  |  |
Carrying amount and estimated fair value of financial instruments |  |  |  |
Cash and due from banks | 25,645 | 26,275 |  |
Securities available-for-sale |  | 0 |  |
Level 2 |  |  |  |
Carrying amount and estimated fair value of financial instruments |  |  |  |
Cash and due from banks | 631,825 | 101,151 |  |
Securities available-for-sale | 1,015,713 | 920,533 |  |
Accrued interest receivable | 3,521 | 3,583 |  |
Deposits | (3,763,358) | (3,278,099) |  |
Short-term borrowings | (116,061) | (80,119) |  |
Accrued interest payable | (1,033) | (1,739) |  |
Level 3 |  |  |  |
Carrying amount and estimated fair value of financial instruments |  |  |  |
Securities available-for-sale | 5,031 | 6,184 |  |
Loans, net | 2,560,683 | 2,648,692 |  |
Accrued interest receivable | 13,436 | 14,940 |  |
Reported Value Measurement [Member] |  |  |  |
Carrying amount and estimated fair value of financial instruments |  |  |  |
Cash and due from banks | 657,470 | 127,426 |  |
Securities available-for-sale | 1,020,744 | 926,717 |  |
Restricted stock | 14,812 | 15,394 |  |
Loans, net | 2,563,242 | 2,636,447 |  |
Accrued interest receivable | 16,957 | 18,523 |  |
Deposits | (3,755,945) | (3,275,357) |  |
Short-term borrowings | (116,061) | (80,119) |  |
Accrued interest payable | (1,033) | (1,739) |  |
Estimate of Fair Value Measurement [Member] |  |  |  |
Carrying amount and estimated fair value of financial instruments |  |  |  |
Cash and due from banks | 657,470 | 127,426 |  |
Securities available-for-sale | 1,020,744 | 926,717 |  |
Loans, net | 2,560,683 | 2,648,692 |  |
Accrued interest receivable | 16,957 | 18,523 |  |
Deposits | (3,763,358) | (3,278,099) |  |
Short-term borrowings | (116,061) | (80,119) |  |
Accrued interest payable | $ (1,033) | $ (1,739) |  |

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