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SECURITIES (Schedule of Securities) (Details) - USD ($) | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
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Schedule of Securities [Line Items] |  |  |  |  |  |
Debt Securities, Trading, Amortized Cost | $ 27,203,000 |  | $ 27,203,000 |  |  |
Securities—trading | 26,875,000 |  | 24,980,000 |  |  |
Debt Securities, Available-for-sale, Amortized Cost, Total | 3,443,516,000 |  | 2,256,189,000 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 45,393,000 |  | 68,543,000 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 42,334,000 |  | 2,139,000 |  |  |
Debt Securities, Available-for-sale | 3,446,575,000 |  | 2,322,593,000 |  |  |
Held-to-maturity Securities, Amortized Cost | 447,812,000 |  | 421,807,000 |  |  |
Held-to-maturity Securities, Gross Unrealized Gains | 20,390,000 |  | 26,980,000 |  |  |
Held-to-maturity Securities, Gross Unrealized Losses | 2,200,000 |  | 106,000 |  |  |
Securities—held-to-maturity | 466,002,000 |  | 448,681,000 |  |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 104,000 |  | (94,000) |  |  |
debt securities, held-to-maturity, accrued interest receivable | 2,700,000 |  | 3,000,000 |  |  |
Debt Securities, Available-for-Sale, Accrued Interest Receivable | 9,300,000 |  | 6,900,000 |  |  |
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 | 180,585,000 |  | 141,668,000 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 1,067,000 |  | 1,002,000 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 600,000 |  | 935,000 |  |  |
Debt Securities, Available-for-sale | 181,052,000 |  | 141,735,000 |  |  |
Held-to-maturity Securities, Amortized Cost | 317,000 |  | 340,000 |  |  |
Held-to-maturity Securities, Gross Unrealized Gains | 6,000 |  | 7,000 |  |  |
Held-to-maturity Securities, Gross Unrealized Losses | 0 |  | 0 |  |  |
Securities—held-to-maturity | 323,000 |  | 347,000 |  |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 0 | $ 0 | 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 | 296,784,000 |  | 283,997,000 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 14,395,000 |  | 19,523,000 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 788,000 |  | 2,000 |  |  |
Debt Securities, Available-for-sale | 310,391,000 |  | 303,518,000 |  |  |
Held-to-maturity Securities, Amortized Cost | 391,583,000 |  | 370,998,000 |  |  |
Held-to-maturity Securities, Gross Unrealized Gains | 18,716,000 |  | 24,130,000 |  |  |
Held-to-maturity Securities, Gross Unrealized Losses | 2,188,000 |  | 94,000 |  |  |
Securities—held-to-maturity | 408,111,000 |  | 395,034,000 |  |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 63,000 | 64,000 | 59,000 | 60,000 | 61,000 | 0
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 | 26,875,000 |  | 24,980,000 |  |  |
Debt Securities, Available-for-sale, Amortized Cost, Total | 160,404,000 |  | 219,086,000 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 3,903,000 |  | 2,762,000 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 63,000 |  | 79,000 |  |  |
Debt Securities, Available-for-sale | 164,244,000 |  | 221,769,000 |  |  |
Held-to-maturity Securities, Amortized Cost | 3,124,000 |  | 3,222,000 |  |  |
Held-to-maturity Securities, Gross Unrealized Gains | 0 |  | 0 |  |  |
Held-to-maturity Securities, Gross Unrealized Losses | 2,000 |  | 12,000 |  |  |
Securities—held-to-maturity | 3,122,000 |  | 3,210,000 |  |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 41,000 | 46,000 | 35,000 | 42,000 | 41,000 | 0
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 | 2,599,229,000 |  | 1,602,033,000 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 25,918,000 |  | 45,179,000 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 40,883,000 |  | 1,060,000 |  |  |
Debt Securities, Available-for-sale | 2,584,264,000 |  | 1,646,152,000 |  |  |
Held-to-maturity Securities, Amortized Cost | 52,788,000 |  | 47,247,000 |  |  |
Held-to-maturity Securities, Gross Unrealized Gains | 1,668,000 |  | 2,843,000 |  |  |
Held-to-maturity Securities, Gross Unrealized Losses | 10,000 |  | 0 |  |  |
Securities—held-to-maturity | 54,446,000 |  | 50,090,000 |  |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 0 | $ 0 | 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 | 206,514,000 |  | 9,405,000 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Gain, before Tax | 110,000 |  | 77,000 |  |  |
Debt Securities, Available-for-sale, Accumulated Gross Unrealized Loss, before Tax | 0 |  | 63,000 |  |  |
Debt Securities, Available-for-sale | 206,624,000 |  | 9,419,000 |  |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | $ 0 |  | $ 0 |  |  |

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