Commitments and Contingencies - Schedule of Direct Exposure to Puerto Rico Government by Maturity (Details) - PR Government direct exposure - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	$ 374,570
Total concentration of risk	374,570
From PR Central Government
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	55
Total concentration of risk	55
From Municipalities
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	374,515
Total concentration of risk	374,515
Loans
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	341,925	$ 342,000
Loans | From PR Central Government
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	0
Loans | From Municipalities
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	341,925
Securities Investment
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	32,645	$ 35,000
Securities Investment | From PR Central Government
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	55
Securities Investment | From Municipalities
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	32,590
Within 1 year | From Municipalities
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	21,312
Total concentration of risk	21,312
Within 1 year | Loans | From Municipalities
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	17,147
Within 1 year | Securities Investment | From Municipalities
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	4,165
After 1 and within 5 years | From PR Central Government
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	3
Total concentration of risk	3
After 1 and within 5 years | From Municipalities
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	148,130
Total concentration of risk	148,130
After 1 and within 5 years | Loans | From PR Central Government
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	0
After 1 and within 5 years | Loans | From Municipalities
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	133,365
After 1 and within 5 years | Securities Investment | From PR Central Government
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	3
After 1 and within 5 years | Securities Investment | From Municipalities
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	14,765
After 5 to 10 years | From PR Central Government
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	16
Total concentration of risk	16
After 5 to 10 years | From Municipalities
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	134,145
Total concentration of risk	134,145
After 5 to 10 years | Loans | From PR Central Government
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	0
After 5 to 10 years | Loans | From Municipalities
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	120,935
After 5 to 10 years | Securities Investment | From PR Central Government
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	16
After 5 to 10 years | Securities Investment | From Municipalities
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	13,210
After 10 years | From PR Central Government
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	36
Total concentration of risk	36
After 10 years | From Municipalities
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	70,928
Total concentration of risk	70,928
After 10 years | Loans | From PR Central Government
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	0
After 10 years | Loans | From Municipalities
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	70,478
After 10 years | Securities Investment | From PR Central Government
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	36
After 10 years | Securities Investment | From Municipalities
Direct exposure to the puerto rico government by maturity
Outstanding concentration of risk	$ 450