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SECURITIES (Schedule of Securities) (Details) - USD ($) | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Mar. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020 | Dec. 31, 2019
Schedule of Securities [Line Items] |  |  |  |
Securities—trading, Amortized Cost | $ 27,203,000 | $ 27,203,000 |  |
Securities—trading | 25,039,000 | 24,980,000 |  |
Available-for-sale Securities, Amortized Cost | 2,996,902,000 | 2,256,189,000 |  |
Available-for-sale Securities, Gross Unrealized Gains | 46,118,000 | 68,543,000 |  |
Available-for-sale Securities, Gross Unrealized Losses | (53,260,000) | (2,139,000) |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 0 | 0 |  |
Securities—available-for-sale | 2,989,760,000 | 2,322,593,000 |  |
Held-to-maturity Securities, Amortized Cost | 441,955,000 | 421,807,000 |  |
Held-to-maturity Securities, Gross Unrealized Gains | 19,414,000 | 26,980,000 |  |
Held-to-maturity Securities, Gross Unrealized Losses | 1,774,000 | 106,000 |  |
Securities—held-to-maturity | 459,595,000 | 448,681,000 |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 98,000 | (94,000) |  |
debt securities, held-to-maturity, accrued interest receivable | 2,700,000 | 3,000,000.0 |  |
Debt Securities, Available-for-Sale, Accrued Interest Receivable | 8,200,000 | 6,900,000 |  |
Trading Securities, Unrealized Holding Gain | 59,000 |  |  |
U.S. Government and agency obligations |  |  |  |
Schedule of Securities [Line Items] |  |  |  |
Available-for-sale Securities, Amortized Cost | 62,922,000 | 141,668,000 |  |
Available-for-sale Securities, Gross Unrealized Gains | 740,000 | 1,002,000 |  |
Available-for-sale Securities, Gross Unrealized Losses | (816,000) | (935,000) |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 0 | 0 |  |
Securities—available-for-sale | 62,846,000 | 141,735,000 |  |
Held-to-maturity Securities, Amortized Cost | 339,000 | 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 | 345,000 | 347,000 |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 0 | 0 | $ 0 | $ 0
Municipal bonds |  |  |  |
Schedule of Securities [Line Items] |  |  |  |
Available-for-sale Securities, Amortized Cost | 287,685,000 | 283,997,000 |  |
Available-for-sale Securities, Gross Unrealized Gains | 14,378,000 | 19,523,000 |  |
Available-for-sale Securities, Gross Unrealized Losses | (1,328,000) | (2,000) |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 0 | 0 |  |
Securities—available-for-sale | 300,735,000 | 303,518,000 |  |
Held-to-maturity Securities, Amortized Cost | 381,136,000 | 370,998,000 |  |
Held-to-maturity Securities, Gross Unrealized Gains | 17,740,000 | 24,130,000 |  |
Held-to-maturity Securities, Gross Unrealized Losses | 1,481,000 | 94,000 |  |
Securities—held-to-maturity | 397,395,000 | 395,034,000 |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 61,000 | 59,000 | 61,000 | 0
Corporate bonds |  |  |  |
Schedule of Securities [Line Items] |  |  |  |
Securities—trading, Amortized Cost | 27,203,000 | 27,203,000 |  |
Securities—trading | 25,039,000 | 24,980,000 |  |
Available-for-sale Securities, Amortized Cost | 243,428,000 | 219,086,000 |  |
Available-for-sale Securities, Gross Unrealized Gains | 2,290,000 | 2,762,000 |  |
Available-for-sale Securities, Gross Unrealized Losses | (290,000) | (79,000) |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 0 | 0 |  |
Securities—available-for-sale | 245,428,000 | 221,769,000 |  |
Held-to-maturity Securities, Amortized Cost | 3,190,000 | 3,222,000 |  |
Held-to-maturity Securities, Gross Unrealized Gains | 0 | 0 |  |
Held-to-maturity Securities, Gross Unrealized Losses | 7,000 | 12,000 |  |
Securities—held-to-maturity | 3,183,000 | 3,210,000 |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 37,000 | 35,000 | 37,000 | 0
Mortgage-backed or related securities |  |  |  |
Schedule of Securities [Line Items] |  |  |  |
Available-for-sale Securities, Amortized Cost | 2,399,117,000 | 1,602,033,000 |  |
Available-for-sale Securities, Gross Unrealized Gains | 28,710,000 | 45,179,000 |  |
Available-for-sale Securities, Gross Unrealized Losses | (50,824,000) | (1,060,000) |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 0 | 0 |  |
Securities—available-for-sale | 2,377,003,000 | 1,646,152,000 |  |
Held-to-maturity Securities, Amortized Cost | 57,290,000 | 47,247,000 |  |
Held-to-maturity Securities, Gross Unrealized Gains | 1,668,000 | 2,843,000 |  |
Held-to-maturity Securities, Gross Unrealized Losses | 286,000 | 0 |  |
Securities—held-to-maturity | 58,672,000 | 50,090,000 |  |
Debt Securities, Held-to-maturity, Allowance for Credit Loss | 0 | 0 | $ 0 | $ 0
Asset-backed securities |  |  |  |
Schedule of Securities [Line Items] |  |  |  |
Available-for-sale Securities, Amortized Cost | 3,750,000 | 9,405,000 |  |
Available-for-sale Securities, Gross Unrealized Gains | 0 | 77,000 |  |
Available-for-sale Securities, Gross Unrealized Losses | (2,000) | (63,000) |  |
Debt Securities, Available-for-sale, Unrealized Loss Position, Number of Positions | 0 | 0 |  |
Securities—available-for-sale | $ 3,748,000 | $ 9,419,000 |  |

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