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INVESTMENT SECURITIES (Narrative) (Details) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2020 USD ($) security shares | Jun. 30, 2019 USD ($) | Mar. 31, 2019 USD ($) shares | Jun. 30, 2020 USD ($) security shares | Jun. 30, 2019 USD ($) | Dec. 31, 2019 USD ($) security | Jan. 01, 2019 USD ($)
Class of Stock [Line Items] |  |  |  |  |  |  |
Proceeds from sale of MasterCard stock |  |  |  | $ 0 | $ 2,555,000 |  |
Available-for-sale securities, sold at par | $ 0 | $ 0 |  | 0 | $ 0 |  |
Investment securities pledged as collateral | $ 597,400,000 |  |  | $ 597,400,000 |  | $ 719,800,000 |
Number of investment securities in an unrealized loss position | security | 25 |  |  | 25 |  | 81 |
Visa [Member] | Common Class B [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Shares owned (in shares) | shares | 34,631 |  |  | 34,631 |  |  |
Credit Card Intermediary [Member] | Common Class B [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Shares owned (in shares) | shares |  |  | 11,170 |  |  |  |
Proceeds from sale of MasterCard stock |  |  | $ 2,600,000 |  |  |  |
Accounting Standards Update 2017-12 [Member] |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |
Debt Securities, Held-to-maturity |  |  |  |  |  |  | $ 148,500,000
Fair value |  |  |  |  |  |  | $ 144,300,000

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