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SECURITIES - Available-for-sale Securities With Unrealized Loss Positions (Details) - USD ($)	Sep. 30, 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	$ 28,225,000	$ 297,304,000
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses	(1,100,000)	(28,730,000)
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value	395,686,000	184,052,000
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses	(75,316,000)	(35,352,000)
Available-for-sale securities with unrealized loss positions, fair value	423,911,000	481,356,000
Available-for-sale securities, with unrealized loss positions, unrealized losses	(76,416,000)	(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	30,557,000	11,644,000
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses	(3,381,000)	(1,391,000)
Available-for-sale securities with unrealized loss positions, fair value	30,557,000	31,836,000
Available-for-sale securities, with unrealized loss positions, unrealized losses	(3,381,000)	(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	1,850,000	8,509,000
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses	(8,000)	(430,000)
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value	16,946,000	12,921,000
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses	(2,568,000)	(2,078,000)
Available-for-sale securities with unrealized loss positions, fair value	18,796,000	21,430,000
Available-for-sale securities, with unrealized loss positions, unrealized losses	(2,576,000)	(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	0	14,248,000
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses	0	(1,697,000)
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value	22,311,000	11,138,000
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses	(6,639,000)	(1,862,000)
Available-for-sale securities with unrealized loss positions, fair value	22,311,000	25,386,000
Available-for-sale securities, with unrealized loss positions, unrealized losses	(6,639,000)	(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	4,172,000	106,204,000
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses	(268,000)	(11,023,000)
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value	96,600,000	15,153,000
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses	(18,991,000)	(2,822,000)
Available-for-sale securities with unrealized loss positions, fair value	100,772,000	121,357,000
Available-for-sale securities, with unrealized loss positions, unrealized losses	(19,259,000)	(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	0	28,901,000
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses	0	(4,739,000)
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value	53,457,000	27,761,000
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses	(11,951,000)	(6,937,000)
Available-for-sale securities with unrealized loss positions, fair value	53,457,000	56,662,000
Available-for-sale securities, with unrealized loss positions, unrealized losses	(11,951,000)	(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	9,304,000	45,410,000
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses	(412,000)	(4,226,000)
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value	83,619,000	54,531,000
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses	(14,221,000)	(8,615,000)
Available-for-sale securities with unrealized loss positions, fair value	92,923,000	99,941,000
Available-for-sale securities, with unrealized loss positions, unrealized losses	(14,633,000)	(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	2,662,000	28,670,000
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses	(130,000)	(2,042,000)
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value	30,735,000	11,626,000
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses	(4,740,000)	(2,530,000)
Available-for-sale securities with unrealized loss positions, fair value	33,397,000	40,296,000
Available-for-sale securities, with unrealized loss positions, unrealized losses	(4,870,000)	(4,572,000)
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	2,211,000	40,408,000
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses	(130,000)	(2,585,000)
Available-for-sale securities with unrealized loss positions, 12 months or more, fair value	61,461,000	39,278,000
Available-for-sale securities with unrealized loss positions, 12 months or more, unrealized losses	(12,825,000)	(9,117,000)
Available-for-sale securities with unrealized loss positions, fair value	63,672,000	79,686,000
Available-for-sale securities, with unrealized loss positions, unrealized losses	(12,955,000)	(11,702,000)
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	8,026,000	4,762,000
Available-for-sale securities with unrealized loss positions, less than 12 months, unrealized losses	(152,000)	(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	8,026,000	4,762,000
Available-for-sale securities, with unrealized loss positions, unrealized losses	$ (152,000)	$ (49,000)

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