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SECURITIES (Securities Debt Maturities) (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Investments, Debt and Equity Securities [Abstract] |  |
Trading Securities, Amortized Cost, Maturing after ten years through twenty years | $ 27,203 |
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 | 27,354 |
Trading Securities, Fair Value | 27,354 | 26,981
Available-for-sale Securities, Amortized Cost, Maturing in one year or less | 9,100 |
Available-for-sale Securities, Amortized Cost, Maturing after one year through five years | 187,185 |
Available-for-sale Securities, Amortized Cost, Maturing after five years through ten years | 799,161 |
Available-for-sale Securities, Amortized Cost, Maturing after ten years through twenty years | 2,319,767 |
Debt Securities, Available-for-sale, Amortized Cost, Total | 3,315,213 | 3,653,160
Available-for-sale Securities, Fair Value, Maturing in one year or less | 9,126 |
Available-for-sale Securities, Fair Value, Maturing after one year through five years | 187,107 |
Available-for-sale Securities, Fair Value, Maturing after five years through ten years | 771,687 |
Available-for-sale Securities, Fair Value, Maturing after ten years through twenty years | 2,179,627 |
Debt Securities, Available-for-sale | 3,147,547 | 3,638,993
Held-to-maturity Securities, Amortized Cost, Maturing in one year or less | 9,664 |
Held-to-maturity Securities, Amortized Cost, Maturing after one year through five years | 45,900 |
Held-to-maturity Securities, Amortized Cost, Maturing after five years through ten years | 26,908 |
Held-to-maturity Securities, Amortized Cost, Maturing after ten years through twenty years | 933,470 |
Held-to-maturity Securities, Amortized Cost | 1,015,942 | 521,355
Held-to-maturity Securities, Fair Value, Maturing in one year or less | 9,670 |
Held-to-maturity Securities, Fair Value, Maturing after one year through five years | 46,116 |
Held-to-maturity Securities, Fair Value, Maturing after five years through ten years | 27,091 |
Held-to-maturity Securities, Fair Value, Maturing after ten years through twenty years | 885,663 |
Debt Securities, Held-to-maturity, Fair Value | 968,540 | $ 541,853
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 |

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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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Balance Type: | debit
Period Type: | instant

X
- Definition Amortized cost of investments in debt securities classified as trading. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant