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INVESTMENT SECURITIES - Available-for-Sale Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Summary of amortized cost, estimated fair value and related unrealized gains and losses on securities available for sale |  |
Amortized Cost | $ 183,776 | $ 142,177
Gross Unrealized Gains | 2,259 | 2,589
Gross Unrealized Losses | 875 | 533
Estimated Fair Value | 185,160 | 144,233
U.S. government agency obligations |  |
Summary of amortized cost, estimated fair value and related unrealized gains and losses on securities available for sale |  |
Amortized Cost | 31,474 | 33,048
Gross Unrealized Gains | 303 | 387
Gross Unrealized Losses | 65 | 70
Estimated Fair Value | 31,712 | 33,365
Obligations of states and political subdivisions |  |
Summary of amortized cost, estimated fair value and related unrealized gains and losses on securities available for sale |  |
Amortized Cost | 140 | 140
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | 140 | 140
Mortgage-backed securities |  |
Summary of amortized cost, estimated fair value and related unrealized gains and losses on securities available for sale |  |
Amortized Cost | 71,448 | 39,454
Gross Unrealized Gains | 1,009 | 1,537
Gross Unrealized Losses | 401 | 0
Estimated Fair Value | 72,056 | 40,991
Corporate debt securities |  |
Summary of amortized cost, estimated fair value and related unrealized gains and losses on securities available for sale |  |
Amortized Cost | 27,752 | 17,199
Gross Unrealized Gains | 446 | 372
Gross Unrealized Losses | 285 | 109
Estimated Fair Value | 27,913 | 17,462
Corporate asset-based securities |  |
Summary of amortized cost, estimated fair value and related unrealized gains and losses on securities available for sale |  |
Amortized Cost | 35,664 | 36,039
Gross Unrealized Gains | 159 | 104
Gross Unrealized Losses | 114 | 316
Estimated Fair Value | 35,709 | 35,827
Trust preferred securities |  |
Summary of amortized cost, estimated fair value and related unrealized gains and losses on securities available for sale |  |
Amortized Cost | 17,298 | 16,297
Gross Unrealized Gains | 342 | 189
Gross Unrealized Losses | 10 | 38
Estimated Fair Value | $ 17,630 | $ 16,448

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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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