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INVESTMENT SECURITIES - Unrealized Gain/Loss on Investment (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
--- | --- | ---
AFS |  |
Amortized cost | $ 1,100,881 | $ 975,763
Gross unrealized gains | 3,264 | 30,084
Gross unrealized losses | (43,961) | (3,325)
Fair value | 1,060,184 | 1,002,522
Residential mortgage-backed securities |  |
AFS |  |
Amortized cost | 30,689 | 32,905
Gross unrealized gains | 6 | 396
Gross unrealized losses | (1,508) | (338)
Fair value | 29,187 | 32,963
Commercial mortgage-backed securities |  |
AFS |  |
Amortized cost | 70,312 | 62,094
Gross unrealized gains | 38 | 933
Gross unrealized losses | (3,958) | (235)
Fair value | 66,392 | 62,792
Residential collateralized mortgage obligations |  |
AFS |  |
Amortized cost | 276,246 | 186,703
Gross unrealized gains | 186 | 2,012
Gross unrealized losses | (9,940) | (1,321)
Fair value | 266,492 | 187,394
Commercial collateralized mortgage obligations |  |
AFS |  |
Amortized cost | 138,168 | 135,102
Gross unrealized gains | 135 | 1,890
Gross unrealized losses | (3,424) | (333)
Fair value | 134,879 | 136,659
Municipal bonds |  |
AFS |  |
Amortized cost | 535,353 | 516,693
Gross unrealized gains | 2,802 | 24,154
Gross unrealized losses | (23,016) | (924)
Fair value | 515,139 | 539,923
HTM |  |
Amortized cost | 4,143 | 4,169
Gross unrealized gains | 8 | 136
Gross unrealized losses | (17) | 0
Fair value | 4,134 | 4,305
Corporate debt securities |  |
AFS |  |
Amortized cost | 26,850 | 18,918
Gross unrealized gains | 97 | 699
Gross unrealized losses | (574) | (1)
Fair value | 26,373 | 19,616
U.S. Treasury securities |  |
AFS |  |
Amortized cost | 23,263 | 23,348
Gross unrealized gains | 0 | 0
Gross unrealized losses | (1,541) | (173)
Fair value | $ 21,722 | $ 23,175

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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=123581744&loc=d3e27161-111563 + Details
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