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SECURITIES - Schedule of Securities Available for Sale (AFS) and Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Securities available for sale
Amortized Cost	$ 1,661,196	$ 1,881,813
Gross Unrealized Gains	571	18,168
Gross Unrealized Losses	(238,567)	(22,396)
Fair Value	1,423,200	1,877,585
Securities available for sale, Allowance	0	0
Securities held to maturity
Amortized Cost	583,453	636,503
Gross Unrealized Gains	699	19,741
Gross Unrealized Losses	(76,688)	(9,008)
Fair Value	507,464	647,236
Securities held to maturity, Allowance	91	105	$ 104	$ 0
Marketable equity securities, Amortized Cost	15,035	15,689
Marketable equity securities, Gross Unrealized Gains	0	67
Marketable equity securities, Gross Unrealized Losses	(2,179)	(303)
Marketable equity securities, Fair Value	12,856	15,453
Amortized Cost	2,259,684	2,534,005
Gross Unrealized Gains	1,270	37,976
Gross Unrealized Losses	(317,434)	(31,707)
Fair Value	1,943,520	2,540,274
Allowance	91	105
U.S Treasuries
Securities available for sale
Amortized Cost	11,972	59,972
Gross Unrealized Gains	1	1
Gross Unrealized Losses	0	0
Fair Value	11,973	59,973
Securities available for sale, Allowance	0	0
Municipal bonds and obligations
Securities available for sale
Amortized Cost	65,943	71,822
Gross Unrealized Gains	422	5,355
Gross Unrealized Losses	(3,030)	0
Fair Value	63,335	77,177
Securities available for sale, Allowance	0	0
Securities held to maturity
Amortized Cost	266,793	281,515
Gross Unrealized Gains	691	16,151
Gross Unrealized Losses	(23,704)	(693)
Fair Value	243,780	296,973
Securities held to maturity, Allowance	66	70	64	0
Agency collateralized mortgage obligations
Securities available for sale
Amortized Cost	631,732	693,782
Gross Unrealized Gains	0	5,566
Gross Unrealized Losses	(99,787)	(11,012)
Fair Value	531,945	688,336
Securities available for sale, Allowance	0	0
Securities held to maturity
Amortized Cost	128,136	149,195
Gross Unrealized Gains	0	3,203
Gross Unrealized Losses	(20,420)	(3,513)
Fair Value	107,716	148,885
Securities held to maturity, Allowance	0	0
Agency mortgage-backed securities
Securities available for sale
Amortized Cost	643,308	711,154
Gross Unrealized Gains	1	2,347
Gross Unrealized Losses	(96,996)	(7,642)
Fair Value	546,313	705,859
Securities available for sale, Allowance	0	0
Securities held to maturity
Amortized Cost	50,958	57,327
Gross Unrealized Gains	0	95
Gross Unrealized Losses	(9,240)	(1,498)
Fair Value	41,718	55,924
Securities held to maturity, Allowance	0	0
Agency commercial mortgage-backed securities
Securities available for sale
Amortized Cost	264,218	300,259
Gross Unrealized Gains	0	3,949
Gross Unrealized Losses	(35,750)	(3,628)
Fair Value	228,468	300,580
Securities available for sale, Allowance	0	0
Securities held to maturity
Amortized Cost	135,206	145,573
Gross Unrealized Gains	0	266
Gross Unrealized Losses	(23,203)	(3,289)
Fair Value	112,003	142,550
Securities held to maturity, Allowance	0	0
Corporate bonds
Securities available for sale
Amortized Cost	43,368	44,824
Gross Unrealized Gains	80	950
Gross Unrealized Losses	(2,938)	(114)
Fair Value	40,510	45,660
Securities available for sale, Allowance	0	0
Tax advantaged economic development bonds
Securities held to maturity
Amortized Cost	2,069	2,728
Gross Unrealized Gains	8	26
Gross Unrealized Losses	(121)	(15)
Fair Value	1,956	2,739
Securities held to maturity, Allowance	25	35	$ 40	$ 0
Other bonds and obligations
Securities available for sale
Amortized Cost	655	0
Gross Unrealized Gains	67	0
Gross Unrealized Losses	(66)	0
Fair Value	656	0
Securities available for sale, Allowance	0	0
Securities held to maturity
Amortized Cost	291	165
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	291	165
Securities held to maturity, Allowance	$ 0	$ 0

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