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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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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).

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