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INVESTMENT SECURITIES - Amortized Cost, Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Available-for-sale Debt Securities: |  |
Amortized cost | $ 975,763 | $ 1,027,338
Gross unrealized gains | 30,084 | 45,568
Gross unrealized losses | (3,325) | (813)
Fair value | 1,002,522 | 1,072,093
Residential Mortgage Backed Securities |  |
Available-for-sale Debt Securities: |  |
Amortized cost | 32,905 | 50,001
Gross unrealized gains | 396 | 1,237
Gross unrealized losses | (338) | (192)
Fair value | 32,963 | 51,046
Commercial Mortgage Backed Securities |  |
Available-for-sale Debt Securities: |  |
Amortized cost | 62,094 | 43,061
Gross unrealized gains | 933 | 2,131
Gross unrealized losses | (235) | (8)
Fair value | 62,792 | 45,184
Collateralized Residential Mortgage Obligations |  |
Available-for-sale Debt Securities: |  |
Amortized cost | 186,703 | 228,685
Gross unrealized gains | 2,012 | 6,319
Gross unrealized losses | (1,321) | (95)
Fair value | 187,394 | 234,909
Collateralized Commercial Mortgage Obligations |  |
Available-for-sale Debt Securities: |  |
Amortized cost | 135,102 | 155,645
Gross unrealized gains | 1,890 | 3,719
Gross unrealized losses | (333) | (181)
Fair value | 136,659 | 159,183
Municipal bonds |  |
Available-for-sale Debt Securities: |  |
Amortized cost | 516,693 | 533,719
Gross unrealized gains | 24,154 | 31,321
Gross unrealized losses | (924) | (337)
Fair value | 539,923 | 564,703
Held-to-maturity Securities |  |
Amortized cost | 4,169 | 4,271
Gross unrealized gains | 136 | 236
Gross unrealized losses | 0 | 0
Fair value | 4,305 | 4,507
Corporate debt securities |  |
Available-for-sale Debt Securities: |  |
Amortized cost | 18,918 | 14,381
Gross unrealized gains | 699 | 841
Gross unrealized losses | (1) | 0
Fair value | 19,616 | 15,222
U.S. Treasury securities |  |
Available-for-sale Debt Securities: |  |
Amortized cost | 23,348 |
Gross unrealized gains | 0 |
Gross unrealized losses | (173) |
Fair value | $ 23,175 |
Agency debentures |  |
Available-for-sale Debt Securities: |  |
Amortized cost |  | 1,846
Gross unrealized gains |  | 0
Gross unrealized losses |  | 0
Fair value |  | $ 1,846

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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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