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INVESTMENT SECURITIES - Summary of Amortized Cost, Gross Unrealized Gains and Losses and Approximate Fair Value of Investment Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Available for sale securities |  |
Amortized Cost | $ 1,598,205 | $ 1,624,906
Gross Unrealized Gains | 1,213 | 422
Gross Unrealized Losses | 241,288 | 238,853
Fair Value | 1,358,130 | 1,386,475
Held to maturity securities |  |
Amortized Cost | 2,023,071 | 2,074,465
Allowance for Credit Losses | 245 | 245
Net Carrying Amount | 2,022,826 | 2,074,220
Gross Unrealized Gains | 259 | 299
Gross Unrealized Losses | 336,090 | 351,244
Fair Value | 1,687,240 | 1,723,520
U.S. Government-sponsored agency securities |  |
Available for sale securities |  |
Amortized Cost | 91,585 | 95,462
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 13,346 | 16,081
Fair Value | 78,239 | 79,381
Held to maturity securities |  |
Amortized Cost | 334,970 | 345,531
Allowance for Credit Losses | 0 | 0
Net Carrying Amount | 334,970 | 345,531
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 52,156 | 63,112
Fair Value | 282,814 | 282,419
State and municipal |  |
Available for sale securities |  |
Amortized Cost | 992,236 | 996,541
Gross Unrealized Gains | 41 | 19
Gross Unrealized Losses | 152,264 | 133,386
Fair Value | 840,013 | 863,174
Held to maturity securities |  |
Amortized Cost | 1,076,773 | 1,085,921
Allowance for Credit Losses | 245 | 245
Net Carrying Amount | 1,076,528 | 1,085,676
Gross Unrealized Gains | 259 | 299
Gross Unrealized Losses | 201,668 | 185,784
Fair Value | 875,364 | 900,436
U.S. Government-sponsored mortgage-backed securities |  |
Available for sale securities |  |
Amortized Cost | 503,417 | 519,943
Gross Unrealized Gains | 1,172 | 403
Gross Unrealized Losses | 75,128 | 88,724
Fair Value | 429,461 | 431,622
Held to maturity securities |  |
Amortized Cost | 609,828 | 641,513
Allowance for Credit Losses | 0 | 0
Net Carrying Amount | 609,828 | 641,513
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 82,266 | 102,343
Fair Value | 527,562 | 539,170
Corporate obligations |  |
Available for sale securities |  |
Amortized Cost | 10,967 | 12,960
Gross Unrealized Gains | 0 | 0
Gross Unrealized Losses | 550 | 662
Fair Value | 10,417 | 12,298
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 | 0 | 5
Fair Value | $ 1,500 | $ 1,495

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 + Details
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