SECURITIES - Available-for-sale Securities With Unrealized Loss Positions (Details) - USD ($)	Mar. 31, 2023	Dec. 31, 2022
Available-for-sale Securities With Unrealized Loss Positions
Available-for-sale securities with unrealized loss positions, less than 12 months, fair value	$ 80,385,000	$ 297,304,000
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses	(3,440,000)	(28,730,000)
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value	378,659,000	184,052,000
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses	(51,685,000)	(35,352,000)
Available-for-sale securities with unrealized loss positions, fair value	459,044,000	481,356,000
Available-for-sale securities, with unrealized loss positions, unrealized losses	(55,125,000)	(64,082,000)
Obligations of the U.S. Treasury
Available-for-sale Securities With Unrealized Loss Positions
Available-for-sale securities with unrealized loss positions, less than 12 months, fair value	0	20,192,000
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses	0	(1,939,000)
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value	31,163,000	11,644,000
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses	(2,761,000)	(1,391,000)
Available-for-sale securities with unrealized loss positions, fair value	31,163,000	31,836,000
Available-for-sale securities, with unrealized loss positions, unrealized losses	(2,761,000)	(3,330,000)
Obligations of U.S. Government agencies
Available-for-sale Securities With Unrealized Loss Positions
Available-for-sale securities with unrealized loss positions, less than 12 months, fair value	8,867,000	8,509,000
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses	(361,000)	(430,000)
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value	14,481,000	12,921,000
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses	(1,770,000)	(2,078,000)
Available-for-sale securities with unrealized loss positions, fair value	23,348,000	21,430,000
Available-for-sale securities, with unrealized loss positions, unrealized losses	(2,131,000)	(2,508,000)
Bank holding company debt securities
Available-for-sale Securities With Unrealized Loss Positions
Available-for-sale securities with unrealized loss positions, less than 12 months, fair value	5,894,000	14,248,000
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses	(1,106,000)	(1,697,000)
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value	18,829,000	11,138,000
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses	(3,118,000)	(1,862,000)
Available-for-sale securities with unrealized loss positions, fair value	24,723,000	25,386,000
Available-for-sale securities, with unrealized loss positions, unrealized losses	(4,224,000)	(3,559,000)
Obligations Of States And Political Subdivisions Tax Exempt
Available-for-sale Securities With Unrealized Loss Positions
Available-for-sale securities with unrealized loss positions, less than 12 months, fair value	12,891,000	106,204,000
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses	(177,000)	(11,023,000)
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value	97,284,000	15,153,000
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses	(10,626,000)	(2,822,000)
Available-for-sale securities with unrealized loss positions, fair value	110,175,000	121,357,000
Available-for-sale securities, with unrealized loss positions, unrealized losses	(10,803,000)	(13,845,000)
Obligations Of States And Political Subdivisions Taxable
Available-for-sale Securities With Unrealized Loss Positions
Available-for-sale securities with unrealized loss positions, less than 12 months, fair value	10,170,000	28,901,000
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses	(380,000)	(4,739,000)
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value	46,902,000	27,761,000
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses	(9,124,000)	(6,937,000)
Available-for-sale securities with unrealized loss positions, fair value	57,072,000	56,662,000
Available-for-sale securities, with unrealized loss positions, unrealized losses	(9,504,000)	(11,676,000)
Residential Passthrough Securities
Available-for-sale Securities With Unrealized Loss Positions
Available-for-sale securities with unrealized loss positions, less than 12 months, fair value	15,066,000	45,410,000
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses	(419,000)	(4,226,000)
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value	82,741,000	54,531,000
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses	(10,802,000)	(8,615,000)
Available-for-sale securities with unrealized loss positions, fair value	97,807,000	99,941,000
Available-for-sale securities, with unrealized loss positions, unrealized losses	(11,221,000)	(12,841,000)
Residential Collateralized Mortgage Obligations
Available-for-sale Securities With Unrealized Loss Positions
Available-for-sale securities with unrealized loss positions, less than 12 months, fair value	7,821,000	28,670,000
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses	(257,000)	(2,042,000)
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value	30,296,000	11,626,000
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses	(3,922,000)	(2,530,000)
Available-for-sale securities with unrealized loss positions, fair value	38,117,000	40,296,000
Available-for-sale securities, with unrealized loss positions, unrealized losses	(4,179,000)	(4,572,000)
Private label commercial mortgage-backed securities
Available-for-sale Securities With Unrealized Loss Positions
Available-for-sale securities with unrealized loss positions, less than 12 months, fair value	4,790,000	4,762,000
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses	(38,000)	(49,000)
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value	0	0
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses	0	0
Available-for-sale securities with unrealized loss positions, fair value	4,790,000	4,762,000
Available-for-sale securities, with unrealized loss positions, unrealized losses	(38,000)	(49,000)
Commercial Mortgage Backed Securities
Available-for-sale Securities With Unrealized Loss Positions
Available-for-sale securities with unrealized loss positions, less than 12 months, fair value	14,886,000	40,408,000
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses	(702,000)	(2,585,000)
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value	56,963,000	39,278,000
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses	(9,562,000)	(9,117,000)
Available-for-sale securities with unrealized loss positions, fair value	71,849,000	79,686,000
Available-for-sale securities, with unrealized loss positions, unrealized losses	$ (10,264,000)	$ (11,702,000)