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Note Commitments and Contingencies (Schedule of Direct Exposure to Puerto Rico Government by Maturity) (Detail) - PR Government Direct Exposure - USD ($)
$ in Thousands
Jul. 02, 2018
Sep. 30, 2018
Dec. 31, 2017
From Municipalities      
Direct Exposure To The Puerto Rico Government By Maturity [Line Items]      
Total concentration of risk $ 23,000    
Outstanding Balance      
Direct Exposure To The Puerto Rico Government By Maturity [Line Items]      
Outstanding concentration of risk   $ 457,995 $ 483,580
Outstanding Balance | From PR Central Government      
Direct Exposure To The Puerto Rico Government By Maturity [Line Items]      
Outstanding concentration of risk   76  
Outstanding Balance | From Government Development Bank      
Direct Exposure To The Puerto Rico Government By Maturity [Line Items]      
Outstanding concentration of risk   4  
Outstanding Balance | From Public Corporation - Puerto Rico Highways And Transportation Authority      
Direct Exposure To The Puerto Rico Government By Maturity [Line Items]      
Outstanding concentration of risk   5  
Outstanding Balance | From Municipalities      
Direct Exposure To The Puerto Rico Government By Maturity [Line Items]      
Outstanding concentration of risk   457,910  
Loans Member | Outstanding Balance      
Direct Exposure To The Puerto Rico Government By Maturity [Line Items]      
Outstanding concentration of risk   413,165 434,493
Loans Member | Outstanding Balance | From PR Central Government      
Direct Exposure To The Puerto Rico Government By Maturity [Line Items]      
Outstanding concentration of risk   0  
Loans Member | Outstanding Balance | From Government Development Bank      
Direct Exposure To The Puerto Rico Government By Maturity [Line Items]      
Outstanding concentration of risk   0  
Loans Member | Outstanding Balance | From Public Corporation - Puerto Rico Highways And Transportation Authority      
Direct Exposure To The Puerto Rico Government By Maturity [Line Items]      
Outstanding concentration of risk   0  
Loans Member | Outstanding Balance | From Municipalities      
Direct Exposure To The Puerto Rico Government By Maturity [Line Items]      
Outstanding concentration of risk   413,165  
Securities Investment Member | Outstanding Balance      
Direct Exposure To The Puerto Rico Government By Maturity [Line Items]      
Outstanding concentration of risk   44,830 $ 49,045
Securities Investment Member | Outstanding Balance | From PR Central Government      
Direct Exposure To The Puerto Rico Government By Maturity [Line Items]      
Outstanding concentration of risk   76  
Securities Investment Member | Outstanding Balance | From Government Development Bank      
Direct Exposure To The Puerto Rico Government By Maturity [Line Items]      
Outstanding concentration of risk   4  
Securities Investment Member | Outstanding Balance | From Public Corporation - Puerto Rico Highways And Transportation Authority      
Direct Exposure To The Puerto Rico Government By Maturity [Line Items]      
Outstanding concentration of risk   5  
Securities Investment Member | Outstanding Balance | From Municipalities      
Direct Exposure To The Puerto Rico Government By Maturity [Line Items]      
Outstanding concentration of risk   44,745  
Within 1 year | Outstanding Balance | From Government Development Bank      
Direct Exposure To The Puerto Rico Government By Maturity [Line Items]      
Outstanding concentration of risk   4  
Within 1 year | Outstanding Balance | From Municipalities      
Direct Exposure To The Puerto Rico Government By Maturity [Line Items]      
Outstanding concentration of risk   18,775  
Within 1 year | Loans Member | Outstanding Balance | From Government Development Bank      
Direct Exposure To The Puerto Rico Government By Maturity [Line Items]      
Outstanding concentration of risk   0  
Within 1 year | Loans Member | Outstanding Balance | From Municipalities      
Direct Exposure To The Puerto Rico Government By Maturity [Line Items]      
Outstanding concentration of risk   15,265  
Within 1 year | Securities Investment Member | Outstanding Balance | From Government Development Bank      
Direct Exposure To The Puerto Rico Government By Maturity [Line Items]      
Outstanding concentration of risk   4  
Within 1 year | Securities Investment Member | Outstanding Balance | From Municipalities      
Direct Exposure To The Puerto Rico Government By Maturity [Line Items]      
Outstanding concentration of risk   3,510  
After 1 and within 5 years | Outstanding Balance | From PR Central Government      
Direct Exposure To The Puerto Rico Government By Maturity [Line Items]      
Outstanding concentration of risk   6  
After 1 and within 5 years | Outstanding Balance | From Municipalities      
Direct Exposure To The Puerto Rico Government By Maturity [Line Items]      
Outstanding concentration of risk   214,527  
After 1 and within 5 years | Loans Member | Outstanding Balance | From PR Central Government      
Direct Exposure To The Puerto Rico Government By Maturity [Line Items]      
Outstanding concentration of risk   0  
After 1 and within 5 years | Loans Member | Outstanding Balance | From Municipalities      
Direct Exposure To The Puerto Rico Government By Maturity [Line Items]      
Outstanding concentration of risk   198,022  
After 1 and within 5 years | Securities Investment Member | Outstanding Balance | From PR Central Government      
Direct Exposure To The Puerto Rico Government By Maturity [Line Items]      
Outstanding concentration of risk   6  
After 1 and within 5 years | Securities Investment Member | Outstanding Balance | From Municipalities      
Direct Exposure To The Puerto Rico Government By Maturity [Line Items]      
Outstanding concentration of risk   16,505  
After 5 to 10 years | Outstanding Balance | From PR Central Government      
Direct Exposure To The Puerto Rico Government By Maturity [Line Items]      
Outstanding concentration of risk   43  
After 5 to 10 years | Outstanding Balance | From Public Corporation - Puerto Rico Highways And Transportation Authority      
Direct Exposure To The Puerto Rico Government By Maturity [Line Items]      
Outstanding concentration of risk   5  
After 5 to 10 years | Outstanding Balance | From Municipalities      
Direct Exposure To The Puerto Rico Government By Maturity [Line Items]      
Outstanding concentration of risk   125,578  
After 5 to 10 years | Loans Member | Outstanding Balance | From PR Central Government      
Direct Exposure To The Puerto Rico Government By Maturity [Line Items]      
Outstanding concentration of risk   0  
After 5 to 10 years | Loans Member | Outstanding Balance | From Public Corporation - Puerto Rico Highways And Transportation Authority      
Direct Exposure To The Puerto Rico Government By Maturity [Line Items]      
Outstanding concentration of risk   0  
After 5 to 10 years | Loans Member | Outstanding Balance | From Municipalities      
Direct Exposure To The Puerto Rico Government By Maturity [Line Items]      
Outstanding concentration of risk   101,693  
After 5 to 10 years | Securities Investment Member | Outstanding Balance | From PR Central Government      
Direct Exposure To The Puerto Rico Government By Maturity [Line Items]      
Outstanding concentration of risk   43  
After 5 to 10 years | Securities Investment Member | Outstanding Balance | From Public Corporation - Puerto Rico Highways And Transportation Authority      
Direct Exposure To The Puerto Rico Government By Maturity [Line Items]      
Outstanding concentration of risk   5  
After 5 to 10 years | Securities Investment Member | Outstanding Balance | From Municipalities      
Direct Exposure To The Puerto Rico Government By Maturity [Line Items]      
Outstanding concentration of risk   23,885  
After 10 years | Outstanding Balance | From PR Central Government      
Direct Exposure To The Puerto Rico Government By Maturity [Line Items]      
Outstanding concentration of risk   27  
After 10 years | Outstanding Balance | From Municipalities      
Direct Exposure To The Puerto Rico Government By Maturity [Line Items]      
Outstanding concentration of risk   99,030  
After 10 years | Loans Member | Outstanding Balance | From PR Central Government      
Direct Exposure To The Puerto Rico Government By Maturity [Line Items]      
Outstanding concentration of risk   0  
After 10 years | Loans Member | Outstanding Balance | From Municipalities      
Direct Exposure To The Puerto Rico Government By Maturity [Line Items]      
Outstanding concentration of risk   98,185  
After 10 years | Securities Investment Member | Outstanding Balance | From PR Central Government      
Direct Exposure To The Puerto Rico Government By Maturity [Line Items]      
Outstanding concentration of risk   27  
After 10 years | Securities Investment Member | Outstanding Balance | From Municipalities      
Direct Exposure To The Puerto Rico Government By Maturity [Line Items]      
Outstanding concentration of risk   $ 845