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SECURITIES (Securities Debt Maturities) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Investments, Debt and Equity Securities [Abstract] |  |
Trading Securities, Amortized Cost, Maturing in one year or less | $ 0 |
Trading Securities, Amortized Cost, Maturing after one year through five years | 0 |
Trading Securities, Amortized Cost, Maturing after five years through ten years | 0 |
Trading Securities, Amortized Cost, Maturing after ten years through twenty years | 27,203 |
Trading Securities, Amortized Cost, Maturing after twenty years | 0 |
Debt Securities, Trading, Amortized Cost | 27,203 | $ 27,203
Trading Securities, Fair Value, Maturing in one year or less | 0 |
Trading Securities, Fair Value, Maturing after one year through five years | 0 |
Trading Securities, Fair Value, Maturing after five years through ten years | 0 |
Trading Securities, Fair Value, Maturing after ten years through twenty years | 26,875 |
Trading Securities, Fair Value, Maturing after twenty years | 0 |
Trading Securities, Fair Value | 26,875 | 24,980
Available-for-sale Securities, Amortized Cost, Maturing in one year or less | 59,150 |
Available-for-sale Securities, Amortized Cost, Maturing after one year through five years | 173,666 |
Available-for-sale Securities, Amortized Cost, Maturing after five years through ten years | 845,638 |
Available-for-sale Securities, Amortized Cost, Maturing after ten years through twenty years | 502,832 |
Available-for-sale Securities, Amortized Cost, Maturing after twenty years | 1,862,230 |
Debt Securities, Available-for-sale, Amortized Cost, Total | 3,443,516 | 2,256,189
Available-for-sale Securities, Fair Value, Maturing in one year or less | 59,360 |
Available-for-sale Securities, Fair Value, Maturing after one year through five years | 181,152 |
Available-for-sale Securities, Fair Value, Maturing after five years through ten years | 847,708 |
Available-for-sale Securities, Fair Value, Maturing after ten years through twenty years | 514,271 |
Available-for-sale Securities, Fair Value, Maturing after twenty years | 1,844,084 |
Debt Securities, Available-for-sale | 3,446,575 | 2,322,593
Held-to-maturity Securities, Amortized Cost, Maturing in one year or less | 5,444 |
Held-to-maturity Securities, Amortized Cost, Maturing after one year through five years | 59,705 |
Held-to-maturity Securities, Amortized Cost, Maturing after five years through ten years | 21,961 |
Held-to-maturity Securities, Amortized Cost, Maturing after ten years through twenty years | 164,303 |
Held-to-maturity Securities, Amortized Cost, Maturing after twenty years | 196,399 |
Held-to-maturity Securities, Amortized Cost | 447,812 | 421,807
Held-to-maturity Securities, Fair Value, Maturing in one year or less | 5,471 |
Held-to-maturity Securities, Fair Value, Maturing after one year through five years | 62,039 |
Held-to-maturity Securities, Fair Value, Maturing after five years through ten years | 23,312 |
Held-to-maturity Securities, Fair Value, Maturing after ten years through twenty years | 168,315 |
Held-to-maturity Securities, Fair Value, Maturing after twenty years | 206,865 |
Debt Securities, Held-to-maturity, Fair Value | $ 466,002 | $ 448,681

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- Definition Amount, after allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity) with single maturity date and allocated without single maturity date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123599081&loc=d3e62586-112803 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f)(1) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27232-111563 + Details
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- Definition Fair value of investment in debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27232-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5A -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123581744&loc=SL120269820-111563 + Details
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- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in net income (trading) and investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.4) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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- Definition Amortized cost of investments in debt securities classified as trading. + References No definition available. + Details
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