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INVESTMENT SECURITIES - Amortized Cost and Approximate Fair Value of Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Available for sale securities |  |
Amortized Cost | $ 1,882,934 | $ 2,273,347
Gross Unrealized Gains | 0 | 439
Gross Unrealized Losses | 382,798 | 297,125
Fair Value | 1,500,136 | 1,976,661
Held to maturity securities |  |
Amortized Cost | 2,213,833 | 2,287,372
Allowance for Credit Losses | 245 | 245
Net Carrying Amount | 2,213,588 | 2,287,127
Gross Unrealized Gains | 14 | 647
Gross Unrealized Losses | 472,622 | 380,154
Fair Value | 1,741,225 | 1,907,865
U.S. Treasury |  |
Available for sale securities |  |
Amortized Cost | 1,737 | 2,501
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 24 | 42
Fair Value | 1,713 | 2,459
U.S. Government-sponsored agency securities |  |
Available for sale securities |  |
Amortized Cost | 114,414 | 119,154
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 20,829 | 17,192
Fair Value | 93,585 | 101,962
Held to maturity securities |  |
Amortized Cost | 378,706 | 392,246
Allowance for Credit Losses | 0 | 0
Net Carrying Amount | 378,706 | 392,246
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 78,882 | 69,147
Fair Value | 299,824 | 323,099
State and municipal |  |
Available for sale securities |  |
Amortized Cost | 1,217,293 | 1,530,048
Gross Unrealized Gains | 0 | 438
Gross Unrealized Losses | 244,237 | 178,726
Fair Value | 973,056 | 1,351,760
Held to maturity securities |  |
Amortized Cost | 1,107,325 | 1,117,552
Allowance for Credit Losses | 245 | 245
Net Carrying Amount | 1,107,080 | 1,117,307
Gross Unrealized Gains | 14 | 647
Gross Unrealized Losses | 258,536 | 197,064
Fair Value | 848,803 | 921,135
U.S. Government-sponsored mortgage-backed securities |  |
Available for sale securities |  |
Amortized Cost | 536,530 | 608,630
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | 116,567 | 100,358
Fair Value | 419,963 | 508,273
Held to maturity securities |  |
Amortized Cost | 726,302 | 776,074
Allowance for Credit Losses | 0 | 0
Net Carrying Amount | 726,302 | 776,074
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 135,163 | 113,915
Fair Value | 591,139 | 662,159
Corporate obligations |  |
Available for sale securities |  |
Amortized Cost | 12,960 | 13,014
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 1,141 | 807
Fair Value | 11,819 | 12,207
Foreign investment |  |
Held to maturity securities |  |
Amortized Cost | 1,500 | 1,500
Allowance for Credit Losses | 0 | 0
Net Carrying Amount | 1,500 | 1,500
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 41 | 28
Fair Value | $ 1,459 | $ 1,472

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