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SECURITIES AVAILABLE FOR SALE, HELD TO MATURITY, AND MARKETABLE EQUITY SECURITIES - Summary of Securities Available for Sale, Held to Maturity, and Marketable Equity Securities (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2022 | Dec. 31, 2021 | Jun. 30, 2022 | Sep. 30, 2021 | Jun. 30, 2021 | Dec. 31, 2020
Securities available for sale |  |  |  |  |  |
Amortized Cost | $ 1,719,126 | $ 1,881,813 |  |  |  |
Gross Unrealized Gains | 175 | 18,168 |  |  |  |
Gross Unrealized Losses | (248,352) | (22,396) |  |  |  |
Fair Value | 1,470,949 | 1,877,585 |  |  |  |
Allowance | 0 | 0 |  |  |  |
Securities held to maturity |  |  |  |  |  |
Amortized Cost | 592,503 | 636,503 |  |  |  |
Gross Unrealized Gains | 304 | 19,741 |  |  |  |
Gross Unrealized Losses | (89,545) | (9,008) |  |  |  |
Fair Value | 503,262 | 647,236 |  |  |  |
Allowance | 95 | 105 | $ 94 | $ 125 | $ 130 | $ 104
Marketable equity securities, amortized cost | 15,035 | 15,689 |  |  |  |
Marketable equity securities, gross unrealized gains | 0 | 67 |  |  |  |
Marketable equity securities, gross unrealized losses | (2,245) | (303) |  |  |  |
Marketable equity securities, fair value | 12,790 | 15,453 |  |  |  |
Total, amortized cost basis | 2,326,664 | 2,534,005 |  |  |  |
Total, gross unrealized gain | 479 | 37,976 |  |  |  |
Total, gross unrealized loss | (340,142) | (31,707) |  |  |  |
Total, fair value | 1,987,001 | 2,540,274 |  |  |  |
Total, allowance | 95 | 105 |  |  |  |
U.S Treasuries |  |  |  |  |  |
Securities available for sale |  |  |  |  |  |
Amortized Cost | 19,997 | 59,972 |  |  |  |
Gross Unrealized Gains | 3 | 1 |  |  |  |
Gross Unrealized Losses | 0 | 0 |  |  |  |
Fair Value | 20,000 | 59,973 |  |  |  |
Allowance |  | 0 |  |  |  |
Municipal bonds and obligations |  |  |  |  |  |
Securities available for sale |  |  |  |  |  |
Amortized Cost | 66,399 | 71,822 |  |  |  |
Gross Unrealized Gains | 21 | 5,355 |  |  |  |
Gross Unrealized Losses | (5,854) | 0 |  |  |  |
Fair Value | 60,566 | 77,177 |  |  |  |
Allowance | 0 | 0 |  |  |  |
Securities held to maturity |  |  |  |  |  |
Amortized Cost | 267,821 | 281,515 |  |  |  |
Gross Unrealized Gains | 299 | 16,151 |  |  |  |
Gross Unrealized Losses | (36,446) | (693) |  |  |  |
Fair Value | 231,674 | 296,973 |  |  |  |
Allowance | 67 | 70 | 66 | 87 | 90 | 64
Agency collateralized mortgage obligations |  |  |  |  |  |
Securities available for sale |  |  |  |  |  |
Amortized Cost | 656,132 | 693,782 |  |  |  |
Gross Unrealized Gains | 0 | 5,566 |  |  |  |
Gross Unrealized Losses | (98,619) | (11,012) |  |  |  |
Fair Value | 557,513 | 688,336 |  |  |  |
Allowance | 0 | 0 |  |  |  |
Securities held to maturity |  |  |  |  |  |
Amortized Cost | 132,931 | 149,195 |  |  |  |
Gross Unrealized Gains | 0 | 3,203 |  |  |  |
Gross Unrealized Losses | (19,965) | (3,513) |  |  |  |
Fair Value | 112,966 | 148,885 |  |  |  |
Allowance | 0 | 0 |  |  |  |
Agency mortgage-backed securities |  |  |  |  |  |
Securities available for sale |  |  |  |  |  |
Amortized Cost | 660,065 | 711,154 |  |  |  |
Gross Unrealized Gains | 1 | 2,347 |  |  |  |
Gross Unrealized Losses | (106,329) | (7,642) |  |  |  |
Fair Value | 553,737 | 705,859 |  |  |  |
Allowance | 0 | 0 |  |  |  |
Securities held to maturity |  |  |  |  |  |
Amortized Cost | 52,175 | 57,327 |  |  |  |
Gross Unrealized Gains | 0 | 95 |  |  |  |
Gross Unrealized Losses | (10,333) | (1,498) |  |  |  |
Fair Value | 41,842 | 55,924 |  |  |  |
Allowance | 0 | 0 |  |  |  |
Agency commercial mortgage-backed securities |  |  |  |  |  |
Securities available for sale |  |  |  |  |  |
Amortized Cost | 270,609 | 300,259 |  |  |  |
Gross Unrealized Gains | 0 | 3,949 |  |  |  |
Gross Unrealized Losses | (35,033) | (3,628) |  |  |  |
Fair Value | 235,576 | 300,580 |  |  |  |
Allowance | 0 | 0 |  |  |  |
Securities held to maturity |  |  |  |  |  |
Amortized Cost | 137,177 | 145,573 |  |  |  |
Gross Unrealized Gains | 0 | 266 |  |  |  |
Gross Unrealized Losses | (22,659) | (3,289) |  |  |  |
Fair Value | 114,518 | 142,550 |  |  |  |
Allowance | 0 | 0 |  |  |  |
Corporate bonds |  |  |  |  |  |
Securities available for sale |  |  |  |  |  |
Amortized Cost | 45,269 | 44,824 |  |  |  |
Gross Unrealized Gains | 83 | 950 |  |  |  |
Gross Unrealized Losses | (2,451) | (114) |  |  |  |
Fair Value | 42,901 | 45,660 |  |  |  |
Allowance | 0 | 0 |  |  |  |
Tax advantaged economic development bonds |  |  |  |  |  |
Securities held to maturity |  |  |  |  |  |
Amortized Cost | 2,235 | 2,728 |  |  |  |
Gross Unrealized Gains | 5 | 26 |  |  |  |
Gross Unrealized Losses | (142) | (15) |  |  |  |
Fair Value | 2,098 | 2,739 |  |  |  |
Allowance | 28 | 35 | $ 28 | $ 38 | $ 40 | $ 40
Other bonds and obligations |  |  |  |  |  |
Securities available for sale |  |  |  |  |  |
Amortized Cost | 655 |  |  |  |  |
Gross Unrealized Gains | 67 |  |  |  |  |
Gross Unrealized Losses | (66) |  |  |  |  |
Fair Value | 656 |  |  |  |  |
Allowance | 0 |  |  |  |  |
Securities held to maturity |  |  |  |  |  |
Amortized Cost | 164 | 165 |  |  |  |
Gross Unrealized Gains | 0 | 0 |  |  |  |
Gross Unrealized Losses | 0 | 0 |  |  |  |
Fair Value | 164 | 165 |  |  |  |
Allowance | $ 0 | $ 0 |  |  |  |

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