Debt Securities Held-to-maturity - Weighted average yield and contractual maturities of debt securities HTM (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Amortized cost
Amortized cost - Within 1 year	$ 602,601
Amortized cost - After 1 to 5 year	7,991,243
Amortized cost - After 5 to 10 years	211,906
Amortized cost - After 10 years	47,075
Amortized cost	8,852,825	$ 9,356,739
Book Value
Book Value - within 1 year	602,601
Book Value - Within 1 to 5 years	7,355,330
Book Value - After 5 to 10 years	189,329
Book Value - After 10 years	47,075
Book Value	8,194,335	8,525,366
Allowance for credit losses
Allowance for credit losses	5,780	6,911
Net of Allowance
Net of Allowance	8,188,555	8,518,455
Gross unrecognized gains
Gross Unrealized Gains	3,578	4,918
Gross unrealized losses
Gross Unrealized Losses	32,748	83,177
Fair Value
Fair Value - within 1 year	595,069
Fair Value - After 1 to 5 years	7,333,795
Fair Value - After 5 to 10 years	189,142
Fair Value - After 10 years	41,379
Fair value	$ 8,159,385	$ 8,440,196
Weighted Average Yield
Weighted Average Yield	1.48%	1.55%
US Treasury Securities
Amortized cost
Amortized cost - Within 1 year	$ 597,768	$ 499,034
Amortized cost - After 1 to 5 year	7,971,072	6,147,568
Amortized cost - After 5 to 10 years	211,061	2,638,238
Amortized cost	8,779,901	9,284,840
Book Value
Book Value - within 1 year	597,768	499,034
Book Value - Within 1 to 5 years	7,335,159	5,640,767
Book Value - After 5 to 10 years	188,484	2,313,666
Book Value	8,121,411	8,453,467
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 - After 5 to 10 years	0	0
Allowance for credit losses	0	0
Net of Allowance
Net of Allowance - Within 1 Year	597,768	499,034
Net of Allowance - After 1 to 5 Years	7,335,159	5,640,767
Net of Allowance - After 5 to 10 Years	188,484	2,313,666
Net of Allowance	8,121,411	8,453,467
Gross unrecognized gains
Gross unrealized gains - Within 1 year	0	0
Gross unrealized gains - After 1 to 5 years	637	0
Gross unrealized gains - After 5 to 10 years	0	0
Gross Unrealized Gains	637	0
Gross unrealized losses
Gross unrealized losses - Within 1 year	7,526	6,203
Gross unrealized losses - After 1 to 5 years	21,996	59,806
Gross unrealized losses - After 5 to 10 years	187	14,857
Gross Unrealized Losses	29,709	80,866
Fair Value
Fair Value - within 1 year	590,242	492,831
Fair Value - After 1 to 5 years	7,313,800	5,580,961
Fair Value - After 5 to 10 years	188,297	2,298,809
Fair value	$ 8,092,339	$ 8,372,601
Weighted Average Yield
Weighted average yield - Within 1 Year	2.58%	2.83%
Weighted average yield - After 1 to 5 years	1.39%	1.49%
Weighted average yield - After 5 to 10 years	1.50%	1.41%
Weighted Average Yield	1.47%	1.54%
Obligations of Puerto Rico, States and political subdivisions
Amortized cost
Amortized cost - Within 1 year	$ 4,820	$ 4,530
Amortized cost - After 1 to 5 year	20,171	19,105
Amortized cost - After 5 to 10 years	845	1,025
Amortized cost - After 10 years	39,572	41,261
Amortized cost	65,408	65,921
Book Value
Book Value - within 1 year	4,820	4,530
Book Value - Within 1 to 5 years	20,171	19,105
Book Value - After 5 to 10 years	845	1,025
Book Value - After 10 years	39,572	41,261
Book Value	65,408	65,921
Allowance for credit losses
Allowance for credit losses - Within 1 Year	9	8
Allowance for credit losses - After 1 to 5 years	147	234
Allowance for credit losses - After 5 to 10 years	28	34
Allowance for credit losses - After 10 years	5,596	6,635
Allowance for credit losses	5,780	6,911	$ 8,096
Net of Allowance
Net of Allowance - Within 1 Year	4,811	4,522
Net of Allowance - After 1 to 5 Years	20,024	18,871
Net of Allowance - After 5 to 10 Years	817	991
Net of Allowance - After 10 Years	33,976	34,626
Net of Allowance	59,628	59,010
Gross unrecognized gains
Gross unrealized gains - Within 1 year	3	5
Gross unrealized gains - After 1 to 5 years	96	150
Gross unrealized gains - After 5 to 10 years	28	34
Gross unrealized gains - After 10 years	2,814	4,729
Gross Unrealized Gains	2,941	4,918
Gross unrealized losses
Gross unrealized losses - Within 1 year	0	0
Gross unrealized losses - After 1 to 5 years	125	82
Gross unrealized losses - After 5 to 10 years	0	0
Gross unrealized losses - After 10 years	2,766	2,229
Gross Unrealized Losses	2,891	2,311
Fair Value
Fair Value - within 1 year	4,814	4,527
Fair Value - After 1 to 5 years	19,995	18,939
Fair Value - After 5 to 10 years	845	1,025
Fair Value - After 10 years	34,024	37,126
Fair value	$ 59,678	$ 61,617
Weighted Average Yield
Weighted average yield - Within 1 Year	6.17%	6.08%
Weighted average yield - After 1 to 5 years	3.80%	4.24%
Weighted average yield - After 5 to 10 years	5.80%	5.80%
Weighted average yield - After 10 years	1.41%	1.40%
Weighted Average Yield	2.55%	2.61%
Collateralized Mortgage Obligations - Federal agencies
Amortized cost
Amortized cost - Within 1 year	$ 13
Amortized cost - After 1 to 5 year		$ 19
Amortized cost - After 10 years	1,543
Amortized cost	1,556	19
Book Value
Book Value - within 1 year	13
Book Value - Within 1 to 5 years		19
Book Value - After 10 years	1,543
Book Value	1,556	19
Allowance for credit losses
Allowance for credit losses - Within 1 Year	0
Allowance for credit losses - After 1 to 5 years		0
Allowance for credit losses - After 10 years	0
Allowance for credit losses	0	0
Net of Allowance
Net of Allowance - Within 1 Year	13
Net of Allowance - After 1 to 5 Years		19
Net of Allowance - After 10 Years	1,543
Net of Allowance	1,556	19
Gross unrecognized gains
Gross unrealized gains - Within 1 year	0
Gross unrealized gains - After 1 to 5 years		0
Gross unrealized gains - After 10 years	0
Gross Unrealized Gains	0	0
Gross unrealized losses
Gross unrealized losses - Within 1 year	0
Gross unrealized losses - After 1 to 5 years		0
Gross unrealized losses - After 10 years	148
Gross Unrealized Losses	148	0
Fair Value
Fair Value - within 1 year	13
Fair Value - After 1 to 5 years		19
Fair Value - After 10 years	1,395
Fair value	$ 1,408	$ 19
Weighted Average Yield
Weighted average yield - Within 1 Year	6.44%
Weighted average yield - After 1 to 5 years		6.44%
Weighted average yield - After 10 years	2.87%
Weighted Average Yield	2.90%	6.44%
Securities in wholly owned statutory business trusts
Amortized cost
Amortized cost - After 10 years	$ 5,960	$ 5,959
Amortized cost	5,960	5,959
Book Value
Book Value - After 10 years	5,960	5,959
Book Value	5,960	5,959
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	5,960	5,959
Net of Allowance	5,960	5,959
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	0	0
Gross Unrealized Losses	0	0
Fair Value
Fair Value - After 10 years	5,960	5,959
Fair value	$ 5,960	$ 5,959
Weighted Average Yield
Weighted average yield - After 10 years	6.33%	6.33%
Weighted Average Yield	6.33%	6.33%

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