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INVESTMENT SECURITIES (Schedule of amortized cost and fair value of securities available-for-sale) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Investment securities available for sale, at fair value | $ 603,168 | $ 266,096
Available-for-sale Securities. |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 607,017 | 262,749
Gross Unrealized/Unrecognized Gains | 1,372 | 3,596
Gross Unrealized/Unrecognized Losses | (5,221) | (249)
Investment securities available for sale, at fair value | 603,168 | 266,096
Available-for-sale Securities. | Residential mortgage securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 504,167 | 192,163
Gross Unrealized/Unrecognized Gains | 1,123 | 2,599
Gross Unrealized/Unrecognized Losses | (3,859) | (74)
Investment securities available for sale, at fair value | 501,431 | 194,688
Available-for-sale Securities. | Commercial mortgage securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 18,270 | 32,589
Gross Unrealized/Unrecognized Gains | 249 | 997
Gross Unrealized/Unrecognized Losses | (263) | (94)
Investment securities available for sale, at fair value | 18,256 | 33,492
Available-for-sale Securities. | Asset-backed Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 4,750 |
Gross Unrealized/Unrecognized Gains | 0 |
Gross Unrealized/Unrecognized Losses | (17) |
Investment securities available for sale, at fair value | 4,733 |
Available-for-sale Securities. | U.S. Government agency securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 67,994 | 37,997
Gross Unrealized/Unrecognized Gains | 0 | 0
Gross Unrealized/Unrecognized Losses | (763) | (81)
Investment securities available for sale, at fair value | 67,231 | $ 37,916
Available-for-sale Securities. | Securities issued by states and political subdivisions in the U.S |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 11,836 |
Gross Unrealized/Unrecognized Gains | 0 |
Gross Unrealized/Unrecognized Losses | (319) |
Investment securities available for sale, at fair value | $ 11,517 |

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563 + Details
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