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INVESTMENT SECURITIES (Available for Sale and Held to Maturity Investment Securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Jun. 30, 2022	May 31, 2022	Dec. 31, 2021
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Amortized Cost	$ 662,827
Gross unrealized gains	0
Gross Unrealized Losses	(71,947)
Held to maturity, fair value	590,880	$ 329,500	$ 343,700	$ 0
Held-to-maturity, allowance for credit loss	0
Available for Sale
Amortized cost	819,936			1,646,508
Gross unrealized gains	26			9,924
Gross unrealized losses	(133,281)			(24,733)
Fair value	686,681			1,631,699
Available-for-sale, allowance for credit loss	0			0
States and political subdivisions
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Amortized Cost	41,808
Gross unrealized gains	0
Gross Unrealized Losses	(5,679)
Held to maturity, fair value	36,129
Held-to-maturity, allowance for credit loss	0
Available for Sale
Amortized cost	176,133			235,521
Gross unrealized gains	11			3,156
Gross unrealized losses	(36,668)			(1,849)
Fair value	139,476			236,828
Available-for-sale, allowance for credit loss	0			0
Corporate securities
Available for Sale
Amortized cost	36,324			41,687
Gross unrealized gains	0			24
Gross unrealized losses	(6,826)			(1,065)
Fair value	29,498			40,646
Available-for-sale, allowance for credit loss	0			0
U.S. Treasury obligations and direct obligations of U.S. Government agencies
Available for Sale
Amortized cost	29,666			35,833
Gross unrealized gains	15			69
Gross unrealized losses	(2,173)			(568)
Fair value	27,508			35,334
Available-for-sale, allowance for credit loss	0			0
Residential - U.S. Government-sponsored entities
Debt Securities, Held-to-maturity, Fair Value to Amortized Cost [Abstract]
Amortized Cost	621,019
Gross unrealized gains	0
Gross Unrealized Losses	(66,268)
Held to maturity, fair value	554,751
Held-to-maturity, allowance for credit loss	0
Available for Sale
Amortized cost	511,171			1,213,910
Gross unrealized gains	0			4,899
Gross unrealized losses	(78,886)			(19,993)
Fair value	432,285			1,198,816
Available-for-sale, allowance for credit loss	0			0
Residential - Non-government agencies
Available for Sale
Amortized cost	10,088			11,942
Gross unrealized gains	0			335
Gross unrealized losses	(1,155)			(64)
Fair value	8,933			12,213
Available-for-sale, allowance for credit loss	0			0
Commercial - U.S. Government-sponsored entities
Available for Sale
Amortized cost	55,012			66,287
Gross unrealized gains	0			756
Gross unrealized losses	(7,550)			(1,194)
Fair value	47,462			65,849
Available-for-sale, allowance for credit loss	0			0
Commercial - Non-government agencies
Available for Sale
Amortized cost	1,542			41,328
Gross unrealized gains	0			685
Gross unrealized losses	(23)			0
Fair value	1,519			42,013
Available-for-sale, allowance for credit loss	$ 0			$ 0