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SECURITIES (Schedule of Securities) (Details) - USD ($) | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
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Schedule of Securities [Line Items] |  |  |  |
Debt Securities, Trading, Amortized Cost | $ 27,203,000 | $ 27,203,000 |  |
Securities—trading | 27,354,000 | 26,981,000 |  |
Debt Securities, Available-for-sale, Amortized Cost, Total | 3,315,213,000 | 3,653,160,000 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 6,139,000 | 36,927,000 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 173,805,000 | 51,094,000 |  |
Securities—available-for-sale | 3,147,547,000 | 3,638,993,000 |  |
Held-to-maturity Securities, Amortized Cost | 1,015,942,000 | 521,355,000 |  |
Held-to-maturity Securities, Gross Unrealized Gains | 2,445,000 | 21,917,000 |  |
Held-to-maturity Securities, Gross Unrealized Losses | 49,847,000 | 1,419,000 |  |
Securities—held-to-maturity | 968,540,000 | 541,853,000 |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 420,000 | (433,000) |  |
debt securities, held-to-maturity, accrued interest receivable | 3,800,000 | 3,300,000 |  |
Debt Securities, Available-for-Sale, Accrued Interest Receivable | 10,100,000 |  |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 0 | 0 |  |
U.S. Government and agency obligations |  |  |  |
Schedule of Securities [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost, Total | 194,774,000 | 201,101,000 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 176,000 | 852,000 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 756,000 | 621,000 |  |
Securities—available-for-sale | 194,194,000 | 201,332,000 |  |
Held-to-maturity Securities, Amortized Cost | 315,000 | 316,000 |  |
Held-to-maturity Securities, Gross Unrealized Gains | 2,000 | 3,000 |  |
Held-to-maturity Securities, Gross Unrealized Losses | 2,000 | 0 |  |
Securities—held-to-maturity | 315,000 | 319,000 |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 0 | 0 | $ 0 | $ 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 0 | 0 |  |
Municipal bonds |  |  |  |
Schedule of Securities [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost, Total | 285,235,000 | 293,761,000 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 3,267,000 | 15,171,000 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 16,238,000 | 320,000 |  |
Securities—available-for-sale | 272,264,000 | 308,612,000 |  |
Held-to-maturity Securities, Amortized Cost | 442,328,000 | 420,555,000 |  |
Held-to-maturity Securities, Gross Unrealized Gains | 2,304,000 | 20,743,000 |  |
Held-to-maturity Securities, Gross Unrealized Losses | 28,252,000 | 1,393,000 |  |
Securities—held-to-maturity | 416,380,000 | 439,905,000 |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 191,000 | 203,000 | 61,000 | 59,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 0 | 0 |  |
Corporate bonds |  |  |  |
Schedule of Securities [Line Items] |  |  |  |
Debt Securities, Trading, Amortized Cost | 27,203,000 | 27,203,000 |  |
Securities—trading | 27,354,000 | 26,981,000 |  |
Debt Securities, Available-for-sale, Amortized Cost, Total | 119,396,000 | 114,427,000 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 383,000 | 3,103,000 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 2,196,000 | 183,000 |  |
Securities—available-for-sale | 117,583,000 | 117,347,000 |  |
Held-to-maturity Securities, Amortized Cost | 3,059,000 | 3,092,000 |  |
Held-to-maturity Securities, Gross Unrealized Gains | 0 | 0 |  |
Held-to-maturity Securities, Gross Unrealized Losses | 18,000 | 3,000 |  |
Securities—held-to-maturity | 3,041,000 | 3,089,000 |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 229,000 | 230,000 | 37,000 | 35,000
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 0 | 0 |  |
Mortgage-backed or related securities |  |  |  |
Schedule of Securities [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost, Total | 2,509,530,000 | 2,837,480,000 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 2,202,000 | 17,749,000 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 153,899,000 | 49,961,000 |  |
Securities—available-for-sale | 2,357,833,000 | 2,805,268,000 |  |
Held-to-maturity Securities, Amortized Cost | 570,240,000 | 97,392,000 |  |
Held-to-maturity Securities, Gross Unrealized Gains | 139,000 | 1,171,000 |  |
Held-to-maturity Securities, Gross Unrealized Losses | 21,575,000 | 23,000 |  |
Securities—held-to-maturity | 548,804,000 | 98,540,000 |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 0 | 0 | $ 0 | $ 0
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 0 | 0 |  |
Asset-backed securities |  |  |  |
Schedule of Securities [Line Items] |  |  |  |
Debt Securities, Available-for-sale, Amortized Cost, Total | 206,278,000 | 206,391,000 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 111,000 | 52,000 |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 716,000 | 9,000 |  |
Securities—available-for-sale | 205,673,000 | 206,434,000 |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | $ 0 | $ 0 |  |

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