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SECURITIES - Schedule of Debt Securities Components (Details) - USD ($) $ in Thousands		Dec. 31, 2022	Dec. 31, 2021
AVAILABLE FOR SALE:
Amortized cost		$ 1,387,874	$ 2,655,594
Gross unrealized gain		1,282	113,681
Gross unrealized loss		90,142	4,950
Securities available for sale, at estimated fair value		1,299,014	2,764,325
HELD TO MATURITY:
Amortized Cost		1,326,729	90,780
Gross unrealized gains		4,565	4,455
Gross unrealized losses		182,138	0
Estimated fair value		1,149,156	95,235
US Treasury Securities
AVAILABLE FOR SALE:
Amortized cost			58,084
Gross unrealized gain			843
Gross unrealized loss			50
Securities available for sale, at estimated fair value			58,877
State and Political Subdivisions
AVAILABLE FOR SALE:
Amortized cost		1,039,453	1,962,257
Gross unrealized gain		956	93,893
Gross unrealized loss		75,557	4,214
Securities available for sale, at estimated fair value		964,852	2,051,936
HELD TO MATURITY:
Amortized Cost		1,037,556	788
Gross unrealized gains		3,969	3
Gross unrealized losses		163,283	0
Estimated fair value		878,242	791
Corporate bonds and other
AVAILABLE FOR SALE:
Amortized cost		8,692	133,333
Gross unrealized gain		26	2,408
Gross unrealized loss		14	209
Securities available for sale, at estimated fair value		8,704	135,532
HELD TO MATURITY:
Amortized Cost		152,552
Gross unrealized gains		575
Gross unrealized losses		7,993
Estimated fair value		145,134
Residential
AVAILABLE FOR SALE:
Amortized cost	[1]	328,400	411,727
Gross unrealized gain	[1]	250	14,895
Gross unrealized loss	[1]	13,623	272
Securities available for sale, at estimated fair value	[1]	315,027	426,350
HELD TO MATURITY:
Amortized Cost	[1]	93,796	38,644
Gross unrealized gains	[1]	21	2,103
Gross unrealized losses	[1]	8,343	0
Estimated fair value	[1]	85,474	40,747
Commercial
AVAILABLE FOR SALE:
Amortized cost	[1]	11,329	90,193
Gross unrealized gain	[1]	50	1,642
Gross unrealized loss	[1]	948	205
Securities available for sale, at estimated fair value	[1]	10,431	91,630
HELD TO MATURITY:
Amortized Cost	[1]	42,825	51,348
Gross unrealized gains	[1]	0	2,349
Gross unrealized losses	[1]	2,519	0
Estimated fair value	[1]	$ 40,306	$ 53,697
[1] All MBS issued and/or guaranteed by U.S. government agencies or U.S. GSEs.

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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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