Significant Accounting (Policies)	9 Months Ended
Sep. 30, 2020
Loans and Leases Receivable Disclosure [Line Items]
Troubled Debt Restructuring [Policy Text Block]	The Corporation’s loss mitigation programs for residential mortgage and consumer loans can provide for one or a combination of the following: movement of interest past due to the end of the loan, extension of the loan term, deferral of principal payments and reduction of interest rates either permanently or for a period of up to six years (increasing back in step-up rates). Additionally, in certain cases, the restructuring may provide for the forgiveness of contractually-due principal or interest. Uncollected interest is added to the principal at the end of the loan term at the time of the restructuring and not recognized as income until collected or when the loan is paid off. These programs are available only to those borrowers who have defaulted, or are likely to default, permanently on their loans and would lose their homes in a foreclosure action absent some lender concession. Nevertheless, if the Corporation is not reasonably assured that the borrower will comply with its contractual commitment, the property is foreclosed. Prior to permanently modifying a loan, the Corporation may enter into trial modifications with certain borrowers. Trial modifications generally represent a six-month period during which the borrower makes monthly payments under the anticipated modified payment terms prior to a formal modification. Upon successful completion of a trial modification, the Corporation and the borrower enter into a permanent modification. TDR loans that are participating in or that have been offered a binding trial modification are classified as TDRs when the trial offer is made and continue to be classified as TDRs regardless of whether the borrower enters into a permanent modification. As of September 30, 2020, the Corporation included as TDRs $2.5 million of residential mortgage loans that were participating in or had been offered a trial modification. For the commercial real estate, commercial and industrial, and construction loan portfolios, at the time of a restructuring, the Corporation determines, on a loan-by-loan basis, whether a concession was granted for economic or legal reasons related to the borrower’s financial difficulty. Concessions granted for loans in these portfolios could include: reductions in interest rates to rates that are considered below market; extension of repayment schedules and maturity dates beyond the original contractual terms; waivers of borrower covenants; forgiveness of principal or interest; or other contractual changes that are considered to be concessions. The Corporation mitigates loan defaults for these loan portfolios through its collection function. The function’s objective is to minimize both early stage delinquencies and losses upon default of loans in these portfolios. In the case of the commercial and industrial, commercial mortgage, and construction loan portfolios, the Corporation’s Special Asset Group (“SAG”) focuses on strategies for the accelerated reduction of non-performing assets through note sales, short sales, loss mitigation programs, and sales of OREO. In addition, the Corporation extends, renews, and restructures loans with satisfactory credit profiles. Many commercial loan facilities are structured as lines of credit, which generally have one-year terms and, therefore, require annual renewals. Other facilities may be restructured or extended from time to time based upon changes in the borrower’s business needs, use of funds, and timing of completion of projects, and other factors. If the borrower is not deemed to have financial difficulties, extensions, renewals, and restructurings are done in the normal course of business and not considered to be concessions, and the loans continue to be recorded as performing.
Residential Portfolio Segment [Member]
Loans and Leases Receivable Disclosure [Line Items]
Financing Receivable, Real Estate Acquired Through Foreclosure [Policy Text Block]	The Corporation commences the foreclosure process on residential real estate loans when a borrower becomes 120 days delinquent in accordance with the requirements of the Consumer Financial Protection Bureau (“CFPB”). Foreclosure procedures and timelines vary depending on whether the property is located in a judicial or non-judicial state. Judicial states (i.e., Puerto Rico, Florida and the USVI) require the foreclosure to be processed through the state’s court while foreclosure in non-judicial states (i.e., the BVI) is processed without court intervention. Foreclosure timelines vary according to local jurisdiction law and investor guidelines. Occasionally, foreclosures may be delayed due to, among other reasons, mandatory mediations, bankruptcy, court delays and title issues

Significant Accounting (Policies)

9 Months Ended

Sep. 30, 2020

Loans and Leases Receivable Disclosure [Line Items]

Troubled Debt Restructuring [Policy Text Block]

The Corporation’s loss mitigation programs for residential mortgage and consumer loans can provide for one or a combination of the following: movement of interest past due to the end of the loan, extension of the loan term, deferral of principal payments and reduction of interest rates either permanently or for a period of up to six years (increasing back in step-up rates). Additionally, in certain cases, the restructuring may provide for the forgiveness of contractually-due principal or interest. Uncollected interest is added to the principal at the end of the loan term at the time of the restructuring and not recognized as income until collected or when the loan is paid off. These programs are available only to those borrowers who have defaulted, or are likely to default, permanently on their loans and would lose their homes in a foreclosure action absent some lender concession. Nevertheless, if the Corporation is not reasonably assured that the borrower will comply with its contractual commitment, the property is foreclosed.

Prior to permanently modifying a loan, the Corporation may enter into trial modifications with certain borrowers. Trial modifications generally represent a six-month period during which the borrower makes monthly payments under the anticipated modified payment terms prior to a formal modification. Upon successful completion of a trial modification, the Corporation and the borrower enter into a permanent modification. TDR loans that are participating in or that have been offered a binding trial modification are classified as TDRs when the trial offer is made and continue to be classified as TDRs regardless of whether the borrower enters into a permanent modification. As of September 30, 2020, the Corporation included as TDRs $2.5 million of residential mortgage loans that were participating in or had been offered a trial modification.

For the commercial real estate, commercial and industrial, and construction loan portfolios, at the time of a restructuring, the Corporation determines, on a loan-by-loan basis, whether a concession was granted for economic or legal reasons related to the borrower’s financial difficulty. Concessions granted for loans in these portfolios could include: reductions in interest rates to rates that are considered below market; extension of repayment schedules and maturity dates beyond the original contractual terms; waivers of borrower covenants; forgiveness of principal or interest; or other contractual changes that are considered to be concessions. The Corporation mitigates loan defaults for these loan portfolios through its collection function. The function’s objective is to minimize both early stage delinquencies and losses upon default of loans in these portfolios. In the case of the commercial and industrial, commercial mortgage, and construction loan portfolios, the Corporation’s Special Asset Group (“SAG”) focuses on strategies for the accelerated reduction of non-performing assets through note sales, short sales, loss mitigation programs, and sales of OREO.

In addition, the Corporation extends, renews, and restructures loans with satisfactory credit profiles. Many commercial loan facilities are structured as lines of credit, which generally have one-year terms and, therefore, require annual renewals. Other facilities may be restructured or extended from time to time based upon changes in the borrower’s business needs, use of funds, and timing of completion of projects, and other factors. If the borrower is not deemed to have financial difficulties, extensions, renewals, and restructurings are done in the normal course of business and not considered to be concessions, and the loans continue to be recorded as performing.

Residential Portfolio Segment [Member]

Loans and Leases Receivable Disclosure [Line Items]

Financing Receivable, Real Estate Acquired Through Foreclosure [Policy Text Block]

The Corporation commences the foreclosure process on residential real estate loans when a borrower becomes 120 days delinquent in accordance with the requirements of the Consumer Financial Protection Bureau (“CFPB”). Foreclosure procedures and timelines vary depending on whether the property is located in a judicial or non-judicial state. Judicial states (i.e., Puerto Rico, Florida and the USVI) require the foreclosure to be processed through the state’s court while foreclosure in non-judicial states (i.e., the BVI) is processed without court intervention. Foreclosure timelines vary according to local jurisdiction law and investor guidelines. Occasionally, foreclosures may be delayed due to, among other reasons, mandatory mediations, bankruptcy, court delays and title issues