SECURITIES - Fair value of securities available for sale and related unrealized gain and loss (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Amortized cost and fair value of investments classified as available for sale
Unrealized Gains	$ 3,989	$ 30,126
Unrealized Losses	(172,134)	(10,182)
Securities available-for-sale	1,330,481	1,359,514
Fair Value	1,330,481	1,359,514
Amortized Cost	1,498,626	1,339,570
U.S. Government agencies
Amortized cost and fair value of investments classified as available for sale
Unrealized Gains	24	2,688
Unrealized Losses	(11,777)	(741)
Fair Value	98,473	120,123
Amortized Cost	110,226	118,176
Mortgage Backed Securities - residential
Amortized cost and fair value of investments classified as available for sale
Unrealized Gains	133	4,387
Unrealized Losses	(91,016)	(6,879)
Fair Value	620,248	626,428
Amortized Cost	711,131	628,920
Mortgage Backed Securities - commercial
Amortized cost and fair value of investments classified as available for sale
Unrealized Gains	0	191
Unrealized Losses	(426)	0
Fair Value	9,677	15,671
Amortized Cost	10,103	15,480
Collateralized Mortgage Obligations
Amortized cost and fair value of investments classified as available for sale
Unrealized Gains	60	1,272
Unrealized Losses	(24,919)	(1,768)
Fair Value	203,485	175,005
Amortized Cost	228,344	175,501
State and municipal obligations
Amortized cost and fair value of investments classified as available for sale
Unrealized Gains	745	17,833
Unrealized Losses	(37,114)	(578)
Fair Value	360,153	380,098
Amortized Cost	396,522	362,843
Municipal taxable
Amortized cost and fair value of investments classified as available for sale
Unrealized Gains	41	396
Unrealized Losses	(6,847)	(215)
Fair Value	32,515	38,626
Amortized Cost	39,321	38,445
U.S. Treasury
Amortized cost and fair value of investments classified as available for sale
Unrealized Gains	0	0
Unrealized Losses	(35)	(1)
Fair Value	2,944	204
Amortized Cost	2,979	205
Collateralized debt obligations
Amortized cost and fair value of investments classified as available for sale
Unrealized Gains	2,986	3,359
Unrealized Losses	0	0
Fair Value	2,986	3,359
Amortized Cost	$ 0	$ 0

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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Amount, before tax, of unrealized loss 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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Amortized cost of 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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Amount excluding accrued interest, of 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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