Commitments and Contingencies - Schedule of Direct Exposure to Puerto Rico Government by Maturity (Details) - PR Government direct exposure - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2022
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	$ 332,588	$ 327,000
Total concentration of risk	361,588	374,000
Investment Portfolio
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	18,860	25,000
Loans
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	313,728	$ 302,000
From PR Central Government
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	40
Total concentration of risk	40
From PR Central Government | Investment Portfolio
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	40
From PR Central Government | Loans
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	0
From PR Central Government | After 1 to 5 years
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	10
Total concentration of risk	10
From PR Central Government | After 1 to 5 years | Investment Portfolio
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	10
From PR Central Government | After 1 to 5 years | Loans
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	0
From PR Central Government | After 5 to 10 years
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	1
Total concentration of risk	1
From PR Central Government | After 5 to 10 years | Investment Portfolio
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	1
From PR Central Government | After 5 to 10 years | Loans
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	0
From PR Central Government | After 10 years
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	29
Total concentration of risk	29
From PR Central Government | After 10 years | Investment Portfolio
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	29
From PR Central Government | After 10 years | Loans
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	0
From Municipalities
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	332,548
Total concentration of risk	361,548
From Municipalities | Investment Portfolio
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	18,820
From Municipalities | Loans
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	313,728
From Municipalities | Within 1 year
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	18,037
Total concentration of risk	43,037
From Municipalities | Within 1 year | Investment Portfolio
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	4,820
From Municipalities | Within 1 year | Loans
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	13,217
From Municipalities | After 1 to 5 years
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	154,674
Total concentration of risk	158,674
From Municipalities | After 1 to 5 years | Investment Portfolio
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	13,155
From Municipalities | After 1 to 5 years | Loans
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	141,519
From Municipalities | After 5 to 10 years
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	113,014
Total concentration of risk	113,014
From Municipalities | After 5 to 10 years | Investment Portfolio
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	845
From Municipalities | After 5 to 10 years | Loans
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	112,169
From Municipalities | After 10 years
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	46,823
Total concentration of risk	46,823
From Municipalities | After 10 years | Investment Portfolio
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	0
From Municipalities | After 10 years | Loans
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	$ 46,823