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Debt Securities Held-to-maturity - Weighted average yield and contractual maturities of debt securities HTM (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Amortized cost    
Amortized cost $ 7,773,319 $ 8,237,004
Book Value    
Book Value 7,433,135 7,758,077
Allowance for credit losses    
Allowance for credit losses 5,837 5,317
Net of Allowance    
Net of Allowance 7,427,298 7,752,760
Gross unrecognized gains    
Gross Unrealized Gains 35,025 2,388
Gross unrealized losses    
Gross Unrealized Losses 2,835 72,484
Fair Value    
Fair value $ 7,459,488 $ 7,682,664
Weighted Average Yield    
Weighted Average Yield 1.32% 1.40%
US Treasury Securities    
Amortized cost    
Amortized cost - Within 1 year $ 2,107,187 $ 599,910
Amortized cost - After 1 to 5 year 5,607,069 7,572,435
Amortized cost 7,714,256 8,172,345
Book Value    
Book Value - within 1 year 2,071,286 599,910
Book Value - Within 1 to 5 years 5,302,786 7,093,508
Book Value 7,374,072 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 2,071,286 599,910
Net of Allowance - After 1 to 5 Years 5,302,786 7,093,508
Net of Allowance 7,374,072 7,693,418
Gross unrecognized gains    
Gross unrealized gains - Within 1 year 2,554 0
Gross unrealized gains - After 1 to 5 years 29,216 0
Gross Unrealized Gains 31,770 0
Gross unrealized losses    
Gross unrealized losses - Within 1 year 762 4,498
Gross unrealized losses - After 1 to 5 years 0 65,096
Gross Unrealized Losses 762 69,594
Fair Value    
Fair Value - within 1 year 2,073,078 595,412
Fair Value - After 1 to 5 years 5,332,002 7,028,412
Fair value $ 7,405,080 $ 7,623,824
Weighted Average Yield    
Weighted average yield - Within 1 Year 1.50% 2.76%
Weighted average yield - After 1 to 5 years 1.24% 1.28%
Weighted Average Yield 1.31% 1.39%
Obligations of Puerto Rico, States and political subdivisions    
Amortized cost    
Amortized cost - Within 1 year $ 2,605 $ 2,440
Amortized cost - After 1 to 5 year 12,530 16,454
Amortized cost - After 5 to 10 years 450 655
Amortized cost - After 10 years 36,012 37,633
Amortized cost 51,597 57,182
Book Value    
Book Value - within 1 year 2,605 2,440
Book Value - Within 1 to 5 years 12,530 16,454
Book Value - After 5 to 10 years 450 655
Book Value - After 10 years 36,012 37,633
Book Value 51,597 57,182
Allowance for credit losses    
Allowance for credit losses - Within 1 Year 9 5
Allowance for credit losses - After 1 to 5 years 44 80
Allowance for credit losses - After 5 to 10 years 15 22
Allowance for credit losses - After 10 years 5,769 5,210
Allowance for credit losses 5,837 5,317
Net of Allowance    
Net of Allowance - Within 1 Year 2,596 2,435
Net of Allowance - After 1 to 5 Years 12,486 16,374
Net of Allowance - After 5 to 10 Years 435 633
Net of Allowance - After 10 Years 30,243 32,423
Net of Allowance 45,760 51,865
Gross unrecognized gains    
Gross unrealized gains - Within 1 year 7 3
Gross unrealized gains - After 1 to 5 years 28 47
Gross unrealized gains - After 5 to 10 years 15 20
Gross unrealized gains - After 10 years 3,205 2,318
Gross Unrealized Gains 3,255 2,388
Gross unrealized losses    
Gross unrealized losses - Within 1 year 0 0
Gross unrealized losses - After 1 to 5 years 80 80
Gross unrealized losses - After 5 to 10 years 0 0
Gross unrealized losses - After 10 years 1,802 2,596
Gross Unrealized Losses 1,882 2,676
Fair Value    
Fair Value - within 1 year 2,603 2,438
Fair Value - After 1 to 5 years 12,434 16,341
Fair Value - After 5 to 10 years 450 653
Fair Value - After 10 years 31,646 32,145
Fair value $ 47,133 $ 51,577
Weighted Average Yield    
Weighted average yield - Within 1 Year 6.43% 6.39%
Weighted average yield - After 1 to 5 years 3.48% 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 2.21% 2.34%
Collateralized Mortgage Obligations - Federal agencies    
Amortized cost    
Amortized cost - After 10 years $ 1,506 $ 1,518
Amortized cost 1,506 1,518
Book Value    
Book Value - After 10 years 1,506 1,518
Book Value 1,506 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 1,506 1,518
Net of Allowance 1,506 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 191 214
Gross Unrealized Losses 191 214
Fair Value    
Fair Value - After 10 years 1,315 1,304
Fair value $ 1,315 $ 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%