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INVESTMENT SECURITIES (Narrative) (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) security shares | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Sep. 30, 2018 USD ($) security shares | Sep. 30, 2017 USD ($) | Dec. 31, 2017 USD ($) security
Class of Stock [Line Items] |  |  |  |  |  |  |
Available-for-sale securities, sold at par | $ 0 | $ 0 | $ 97,700 | $ 0 | $ 0 |  |
Payments to acquire available-for-sale securities |  |  | $ 97,400 |  | 85,334 | $ 333,242 |
Available-for-sale securities, average yield of securities sold |  |  | 1.91% |  |  |  |
Available-for-sale securities, gross realized gains (losses), sale proceeds |  |  | $ 96,000 |  |  |  |
Available-for-sale securities, average yield of securities acquired |  |  | 2.57% |  |  |  |
Available-for-sale securities, gross realized losses |  |  | $ 1,600 |  |  |  |
Investment securities pledged as collateral | $ 1,000,000 |  |  |  | $ 1,000,000 |  | $ 1,080,000
Number of investment securities in an unrealized loss position | security | 379 |  |  |  | 379 |  | 223
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 |  |  |  | 11,170 |  |

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