DEBT SECURITIES - Continuous Unrealized Loss on Investment (Details) $ in Thousands	Sep. 30, 2025 USD ($)	Dec. 31, 2024 USD ($)
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]
AFS, Less than 12 months, Fair value	$ 333,924	$ 1,498,469
AFS, Less than 12 months, Gross unrealized losses	970	15,921
AFS, Twelve months or more, Fair value	655,124	486,665
AFS, Twelve months or more, Gross unrealized losses	43,437	61,961
AFS, Total, Fair value	989,048	1,985,134
AFS, Total, Gross unrealized losses	$ 44,407	$ 77,882
Number of securities with unrealized losses
AFS, Less than 12 months, Number of positions with unrealized losses	142	60
AFS, 12 months or more, Number of positions with unrealized losses	252	280
AFS, Total , Number of positions with unrealized losses	394	340
Obligations of states and political subdivisions
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]
AFS, Less than 12 months, Fair value	$ 60,303	$ 19,273
AFS, Less than 12 months, Gross unrealized losses	222	162
AFS, Twelve months or more, Fair value	31,326	28,394
AFS, Twelve months or more, Gross unrealized losses	696	1,037
AFS, Total, Fair value	91,629	47,667
AFS, Total, Gross unrealized losses	918	1,199
Mortgage-backed securities - residential
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]
AFS, Less than 12 months, Fair value	196,863	1,381,125
AFS, Less than 12 months, Gross unrealized losses	517	15,337
AFS, Twelve months or more, Fair value	438,518	311,751
AFS, Twelve months or more, Gross unrealized losses	26,747	37,827
AFS, Total, Fair value	635,381	1,692,876
AFS, Total, Gross unrealized losses	27,264	53,164
Mortgage-backed securities - commercial
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]
AFS, Less than 12 months, Fair value	46,281	98,071
AFS, Less than 12 months, Gross unrealized losses	69	422
AFS, Twelve months or more, Fair value	158,651	107,118
AFS, Twelve months or more, Gross unrealized losses	12,624	18,531
AFS, Total, Fair value	204,932	205,189
AFS, Total, Gross unrealized losses	12,693	18,953
Corporate bonds
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]
AFS, Less than 12 months, Fair value	3,387	0
AFS, Less than 12 months, Gross unrealized losses	121	0
AFS, Twelve months or more, Fair value	26,629	39,402
AFS, Twelve months or more, Gross unrealized losses	3,370	4,566
AFS, Total, Fair value	30,016	39,402
AFS, Total, Gross unrealized losses	3,491	$ 4,566
U.S. Treasury securities
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]
AFS, Less than 12 months, Fair value	20,579
AFS, Less than 12 months, Gross unrealized losses	18
AFS, Twelve months or more, Fair value	0
AFS, Twelve months or more, Gross unrealized losses	0
AFS, Total, Fair value	20,579
AFS, Total, Gross unrealized losses	18
Agency debentures
Debt Securities, Available-for-Sale, Unrealized Loss Position, Accumulated Loss [Abstract]
AFS, Less than 12 months, Fair value	6,511
AFS, Less than 12 months, Gross unrealized losses	23
AFS, Twelve months or more, Fair value	0
AFS, Twelve months or more, Gross unrealized losses	0
AFS, Total, Fair value	6,511
AFS, Total, Gross unrealized losses	$ 23

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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