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INVESTMENT SECURITIES (Tables)

9 Months Ended

Sep. 30, 2025

Investments, Debt and Equity Securities [Abstract]

Schedule of Investment Securities

The amortized cost, gross unrealized gains and losses, fair value, weighted average yield and contractual maturities of the securities owned by OFG at September 30, 2025 and December 31, 2024 were as follows:

			September 30, 2025
			Amortized Cost						Gross Unrealized Gains						Gross Unrealized Losses						Fair Value						Weighted Average Yield
			(In thousands)
Available-for-sale
Mortgage-backed securities
FNMA and FHLMC certificates
Due after 10 years			$	2,096,291					$	27,145					$	37,277					$	2,086,159					4.60		%
GNMA certificates
Due from 5 to 10 years			3,155						—						59						3,096						1.78		%
Due after 10 years			492,997						11,321						31,908						472,410						3.77		%
Total GNMA certificates			496,152						11,321						31,967						475,506						3.76		%
CMOs issued by US government-sponsored agencies
Due after 10 years			3,209						—						43						3,166						2.49		%
Total mortgage-backed securities			2,595,652						38,466						69,287						2,564,831						4.44		%
Investment securities
US Treasury securities
Due less than 1 year			1,634						1						—						1,635						4.13		%
Other debt securities
Due from 1 to 5 years			500						—						—						500						2.35		%
Due after 10 years			3						—						—						3						2.97		%
Total other debt securities			503						—						—						503						2.35		%
Total investment securities			2,137						1						—						2,138						3.71		%
Total securities available for sale			$	2,597,789					$	38,467					$	69,287					$	2,566,969					4.44		%
			September 30, 2025
			Amortized Cost						Gross Unrealized Gains						Gross Unrealized Losses						Fair Value						Weighted Average Yield
			(In thousands)
Held-to-maturity
Mortgage-backed securities
FNMA and FHLMC certificates
Due after 10 years			$	275,116					$	—					$	47,252					$	227,864					1.73		%
Other debt securities
Due from 1 to 5 years			35,000						1						—						35,001						5.27		%
Total securities held to maturity			$	310,116					$	1					$	47,252					$	262,865					2.13		%

			December 31, 2024
			Amortized Cost						Gross Unrealized Gains						Gross Unrealized Losses						Fair Value						Weighted Average Yield
			(In thousands)
Available-for-sale
Mortgage-backed securities
FNMA and FHLMC certificates
Due from 1 to 5 years			$	14,930					$	—					$	587					$	14,343					2.07		%
Due from 5 to 10 years			23,664						—						1,415						22,249						1.90		%
Due after 10 years			1,943,193						5,545						72,449						1,876,289						4.51		%
Total FNMA and FHLMC certificates			1,981,787						5,545						74,451						1,912,881						4.46		%
GNMA certificates
Due from 1 to 5 years			6,215						—						177						6,038						1.74		%
Due from 5 to 10 years			11,358						10						641						10,727						2.25		%
Due after 10 years			437,308						4,058						40,146						401,220						3.63		%
Total GNMA certificates			454,881						4,068						40,964						417,985						3.57		%
CMOs issued by US government-sponsored agencies
Due from 1 to 5 years			5,015						—						126						4,889						1.78		%
Due after 10 years			753						—						3						750						5.07		%
Total CMOs issued by US government-sponsored agencies			5,768						—						129						5,639						2.21		%
Total mortgage-backed securities			2,442,436						9,613						115,544						2,336,505						4.29		%
Investment securities
US Treasury securities
Due less than 1 year			1,149						1						—						1,150						4.85		%
Other debt securities
Due from 1 to 5 years			550						—						—						550						2.41		%
Total investment securities			1,699						1						—						1,700						4.06		%
Total securities available for sale			$	2,444,135					$	9,614					$	115,544					$	2,338,205					4.29		%
			December 31, 2024
			Amortized Cost						Gross Unrealized Gains						Gross Unrealized Losses						Fair Value						Weighted Average Yield
			(In thousands)
Held-to-maturity
Mortgage-backed securities
FNMA and FHLMC certificates
Due after 10 years			$	292,158					$	—					$	60,006					$	232,152					1.73		%
Investment securities
Other debt securities
Due from 1 to 5 years			35,000						22						—						35,022						5.53		%
Total securities held to maturity			$	327,158					$	22					$	60,006					$	267,174					2.13		%

Schedule of Gross Realized Gains and Losses by Category

						Nine-Month Period Ended September 30, 2024
Description						Sale Price						Book Value at Sale						Gross Gains						Gross Losses
						(In thousands)
Sale of investment securities available-for-sale
Investment securities
US Treasury securities						$	149,406					$	149,413					$	—					$	7

Schedule of Unrealized Gains and Losses by Category

The following table shows OFG’s gross unrealized losses and fair value of investment securities available-for-sale at September 30, 2025 and December 31, 2024, aggregated by investment category and the length of time that individual securities have been in a continuous unrealized loss position:

						September 30, 2025
						Less than 12 months												12 months or more												Total
						Fair Value						Unrealized Loss						Fair Value						Unrealized Loss						Fair Value						Unrealized Loss
						(In thousands)
Securities available-for-sale
FNMA and FHLMC certificates						$	99,560					$	412					$	553,694					$	36,865					$	653,254					$	37,277
GNMA certificates						10,010						301						225,797						31,666						235,807						31,967
CMOs issued by US government-sponsored agencies						—						—						3,166						43						3,166						43
						$	109,570					$	713					$	782,657					$	68,574					$	892,227					$	69,287

									December 31, 2024
									Less than 12 months															12 months or more																		Total
									Fair Value						Unrealized Loss									Fair Value									Unrealized Loss									Fair Value						Unrealized Loss
									(In thousands)
Securities available-for-sale
FNMA and FHLMC certificates									$	791,987					$	12,989								$	579,727								$	61,462								$	1,371,714					$	74,451
GNMA certificates									83,773						2,019									201,320									38,945									285,093						40,964
CMOs issued by US government-sponsored agencies									—						—									5,639									129									5,639						129
									$	875,760					$	15,008								$	786,686								$	100,536								$	1,662,446					$	115,544

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