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Debt Securities Held-to-maturity - Weighted average yield and contractual maturities of debt securities HTM (Details) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024	Mar. 31, 2024	Dec. 31, 2023
Amortized cost
Amortized cost	$ 8,082,335	$ 8,237,004
Book Value
Book Value	7,648,718	7,758,077
Allowance for credit losses
Allowance for credit losses	5,481	5,317
Net of Allowance
Net of Allowance	7,643,237	7,752,760
Gross unrecognized gains
Gross Unrealized Gains	5,205	2,388
Gross unrealized losses
Gross Unrealized Losses	7,756	72,484
Fair Value
Fair value	$ 7,640,686	$ 7,682,664
Weighted Average Yield
Weighted Average Yield	1.38%	1.40%
US Treasury Securities
Amortized cost
Amortized cost - Within 1 year	$ 850,742	$ 599,910
Amortized cost - After 1 to 5 year	7,169,044	7,572,435
Amortized cost	8,019,786	8,172,345
Book Value
Book Value - within 1 year	844,252	599,910
Book Value - Within 1 to 5 years	6,741,917	7,093,508
Book Value	7,586,169	7,693,418
Allowance for credit losses
Allowance for credit losses - Within 1 Year	0	0
Allowance for credit losses - After 1 to 5 years	0	0
Allowance for credit losses	0	0
Net of Allowance
Net of Allowance - Within 1 Year	844,252	599,910
Net of Allowance - After 1 to 5 Years	6,741,917	7,093,508
Net of Allowance	7,586,169	7,693,418
Gross unrecognized gains
Gross unrealized gains - Within 1 year	0	0
Gross unrealized gains - After 1 to 5 years	2,506	0
Gross Unrealized Gains	2,506	0
Gross unrealized losses
Gross unrealized losses - Within 1 year	3,680	4,498
Gross unrealized losses - After 1 to 5 years	1,481	65,096
Gross Unrealized Losses	5,161	69,594
Fair Value
Fair Value - within 1 year	840,572	595,412
Fair Value - After 1 to 5 years	6,742,942	7,028,412
Fair value	$ 7,583,514	$ 7,623,824
Weighted Average Yield
Weighted average yield - Within 1 Year	2.45%	2.76%
Weighted average yield - After 1 to 5 years	1.24%	1.28%
Weighted Average Yield	1.37%	1.39%
Obligations of Puerto Rico, States and political subdivisions
Amortized cost
Amortized cost - Within 1 year	$ 2,540	$ 2,440
Amortized cost - After 1 to 5 year	14,798	16,454
Amortized cost - After 5 to 10 years	655	655
Amortized cost - After 10 years	37,082	37,633
Amortized cost	55,075	57,182
Book Value
Book Value - within 1 year	2,540	2,440
Book Value - Within 1 to 5 years	14,798	16,454
Book Value - After 5 to 10 years	655	655
Book Value - After 10 years	37,082	37,633
Book Value	55,075	57,182
Allowance for credit losses
Allowance for credit losses - Within 1 Year	11	5
Allowance for credit losses - After 1 to 5 years	69	80
Allowance for credit losses - After 5 to 10 years	22	22
Allowance for credit losses - After 10 years	5,379	5,210
Allowance for credit losses	5,481	5,317	$ 5,731	$ 5,780
Net of Allowance
Net of Allowance - Within 1 Year	2,529	2,435
Net of Allowance - After 1 to 5 Years	14,729	16,374
Net of Allowance - After 5 to 10 Years	633	633
Net of Allowance - After 10 Years	31,703	32,423
Net of Allowance	49,594	51,865
Gross unrecognized gains
Gross unrealized gains - Within 1 year	10	3
Gross unrealized gains - After 1 to 5 years	36	47
Gross unrealized gains - After 5 to 10 years	21	20
Gross unrealized gains - After 10 years	2,632	2,318
Gross Unrealized Gains	2,699	2,388
Gross unrealized losses
Gross unrealized losses - Within 1 year	1	0
Gross unrealized losses - After 1 to 5 years	84	80
Gross unrealized losses - After 5 to 10 years	0	0
Gross unrealized losses - After 10 years	2,325	2,596
Gross Unrealized Losses	2,410	2,676
Fair Value
Fair Value - within 1 year	2,538	2,438
Fair Value - After 1 to 5 years	14,681	16,341
Fair Value - After 5 to 10 years	654	653
Fair Value - After 10 years	32,010	32,145
Fair value	$ 49,883	$ 51,577
Weighted Average Yield
Weighted average yield - Within 1 Year	6.41%	6.39%
Weighted average yield - After 1 to 5 years	3.39%	3.69%
Weighted average yield - After 5 to 10 years	5.81%	5.81%
Weighted average yield - After 10 years	1.42%	1.42%
Weighted Average Yield	2.23%	2.34%
Collateralized Mortgage Obligations - Federal agencies
Amortized cost
Amortized cost - After 10 years	$ 1,514	$ 1,518
Amortized cost	1,514	1,518
Book Value
Book Value - After 10 years	1,514	1,518
Book Value	1,514	1,518
Allowance for credit losses
Allowance for credit losses - After 10 years	0	0
Allowance for credit losses	0	0
Net of Allowance
Net of Allowance - After 10 Years	1,514	1,518
Net of Allowance	1,514	1,518
Gross unrecognized gains
Gross unrealized gains - After 10 years	0	0
Gross Unrealized Gains	0	0
Gross unrealized losses
Gross unrealized losses - After 10 years	185	214
Gross Unrealized Losses	185	214
Fair Value
Fair Value - After 10 years	1,329	1,304
Fair value	$ 1,329	$ 1,304
Weighted Average Yield
Weighted average yield - After 10 years	2.87%	2.87%
Weighted Average Yield	2.87%	2.87%
Securities in wholly owned statutory business trusts
Amortized cost
Amortized cost - After 5 to 10 years	$ 5,960	$ 5,959
Amortized cost	5,960	5,959
Book Value
Book Value - After 5 to 10 years	5,960	5,959
Book Value	5,960	5,959
Allowance for credit losses
Allowance for credit losses - After 5 to 10 years	0	0
Allowance for credit losses	0	0
Net of Allowance
Net of Allowance - After 5 to 10 Years	5,960	5,959
Net of Allowance	5,960	5,959
Gross unrecognized gains
Gross unrealized gains - After 5 to 10 years	0	0
Gross Unrealized Gains	0	0
Gross unrealized losses
Gross unrealized losses - After 5 to 10 years	0	0
Gross Unrealized Losses	0	0
Fair Value
Fair Value - After 5 to 10 years	5,960	5,959
Fair value	$ 5,960	$ 5,959
Weighted Average Yield
Weighted average yield - After 5 to 10 years	6.33%	6.33%
Weighted Average Yield	6.33%	6.33%