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FAIR VALUES OF FINANCIAL INSTRUMENTS - Fair Value Option Loans Held-for-Sale (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Continuing Operations |  |  |
Fair Value |  |  |
Total loans | $ 7,690 | $ 66,603 |
Non-accrual loans | 2,427 | 60,999 |
Loans past due 90 days or more and still accruing | 0 | 0 |
Unpaid Principal Balance |  |  |
Total loans | 7,906 | 67,415 |
Non-accrual loans | 2,538 | 61,900 |
Loans past due 90 days or more and still accruing | 0 | 0 |
Difference |  |  |
Total loans | (216) | (812) |
Non-accrual loans | (111) | (901) |
Loans past due 90 days or more and still accruing | 0 | 0 |
Non-accrual loans, guaranteed by US government |  | 1,600 | $ 54,200
Net gain (loss) on sale of loans (continuing operations) | 204 | (170) | 29
Discontinued Operations |  |  |
Fair Value |  |  |
Total loans | 19,490 | 38,696 |
Non-accrual loans | 8,430 | 24,073 |
Loans past due 90 days or more and still accruing | 0 | 0 |
Unpaid Principal Balance |  |  |
Total loans | 20,027 | 39,541 |
Non-accrual loans | 8,496 | 24,297 |
Loans past due 90 days or more and still accruing | 0 | 0 |
Difference |  |  |
Total loans | (537) | (845) |
Non-accrual loans | (66) | (224) |
Loans past due 90 days or more and still accruing | 0 | 0 |
Non-accrual loans, guaranteed by US government |  | 7,600 | 20,700
Net gain (loss) on sale of loans (continuing operations) | $ 159 | $ (288) | $ 7,365

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