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INVESTMENT SECURITIES - Amortized Cost and Approximate Fair Value of Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Available for sale securities |  |
Amortized Cost | $ 1,921,167 | $ 2,273,347
Gross Unrealized Gains | 23 | 439
Gross Unrealized Losses | 269,828 | 297,125
Fair Value | 1,651,362 | 1,976,661
Held to maturity securities |  |
Amortized Cost | 2,240,374 | 2,287,372
Allowance for Credit Losses | 245 | 245
Net Carrying Amount | 2,240,129 | 2,287,127
Gross Unrealized Gains | 644 | 647
Gross Unrealized Losses | 360,335 | 380,154
Fair Value | 1,880,683 | 1,907,865
U.S. Treasury |  |
Available for sale securities |  |
Amortized Cost | 2,126 | 2,501
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 35 | 42
Fair Value | 2,091 | 2,459
U.S. Government-sponsored agency securities |  |
Available for sale securities |  |
Amortized Cost | 115,876 | 119,154
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 17,522 | 17,192
Fair Value | 98,354 | 101,962
Held to maturity securities |  |
Amortized Cost | 381,915 | 392,246
Allowance for Credit Losses | 0 | 0
Net Carrying Amount | 381,915 | 392,246
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 69,466 | 69,147
Fair Value | 312,449 | 323,099
State and municipal |  |
Available for sale securities |  |
Amortized Cost | 1,233,589 | 1,530,048
Gross Unrealized Gains | 23 | 438
Gross Unrealized Losses | 154,269 | 178,726
Fair Value | 1,079,343 | 1,351,760
Held to maturity securities |  |
Amortized Cost | 1,111,355 | 1,117,552
Allowance for Credit Losses | 245 | 245
Net Carrying Amount | 1,111,110 | 1,117,307
Gross Unrealized Gains | 644 | 647
Gross Unrealized Losses | 180,637 | 197,064
Fair Value | 931,362 | 921,135
U.S. Government-sponsored mortgage-backed securities |  |
Available for sale securities |  |
Amortized Cost | 556,602 | 608,630
Gross Unrealized Gains | 0 | 1
Gross Unrealized Losses | 96,815 | 100,358
Fair Value | 459,787 | 508,273
Held to maturity securities |  |
Amortized Cost | 745,604 | 776,074
Allowance for Credit Losses | 0 | 0
Net Carrying Amount | 745,604 | 776,074
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 110,191 | 113,915
Fair Value | 635,413 | 662,159
Corporate obligations |  |
Available for sale securities |  |
Amortized Cost | 12,974 | 13,014
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 1,187 | 807
Fair Value | 11,787 | 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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