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SECURITIES - Fair value of securities available for sale and related unrealized gain and loss (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Amortized cost and fair value of investments classified as available for sale
Amortized Cost	$ 1,412,498	$ 1,498,626
Unrealized Gains	4,484	3,989
Unrealized Losses	(157,845)	(172,134)
Fair Value	1,259,137	1,330,481
Amortized Cost	1,259,137
U.S. Government agencies
Amortized cost and fair value of investments classified as available for sale
Amortized Cost	102,978	110,226
Unrealized Gains	4	24
Unrealized Losses	(11,542)	(11,777)
Fair Value	91,440	98,473
Mortgage Backed Securities - residential
Amortized cost and fair value of investments classified as available for sale
Amortized Cost	653,507	711,131
Unrealized Gains	53	133
Unrealized Losses	(83,675)	(91,016)
Fair Value	569,885	620,248
Mortgage Backed Securities - commercial
Amortized cost and fair value of investments classified as available for sale
Amortized Cost	7,919	10,103
Unrealized Gains	0	0
Unrealized Losses	(436)	(426)
Fair Value	7,483	9,677
Collateralized mortgage obligations
Amortized cost and fair value of investments classified as available for sale
Amortized Cost	209,398	228,344
Unrealized Gains	6	60
Unrealized Losses	(28,575)	(24,919)
Fair Value	180,829	203,485
State and municipal obligations
Amortized cost and fair value of investments classified as available for sale
Amortized Cost	397,413	396,522
Unrealized Gains	1,407	745
Unrealized Losses	(28,009)	(37,114)
Fair Value	370,811	360,153
Municipal taxable
Amortized cost and fair value of investments classified as available for sale
Amortized Cost	39,872	39,321
Unrealized Gains	12	41
Unrealized Losses	(5,599)	(6,847)
Fair Value	34,285	32,515
U.S. Treasury
Amortized cost and fair value of investments classified as available for sale
Amortized Cost	1,411	2,979
Unrealized Gains	0	0
Unrealized Losses	(9)	(35)
Fair Value	1,402	2,944
Collateralized debt obligations
Amortized cost and fair value of investments classified as available for sale
Amortized Cost	0	0
Unrealized Gains	3,002	2,986
Unrealized Losses	0	0
Fair Value	$ 3,002	$ 2,986

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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

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-Topic 320
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-Name Accounting Standards Codification
-Section 50
-Paragraph 2
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