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Loans (Recorded Investment in loans individually evaluated for impairment) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Mar. 31, 2020
Financing Receivable, Impaired [Line Items]
Related allowance	$ 116,539	$ 230,755
Originated Loan [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal	151,229
Recorded Investment	131,646
Related allowance	$ 15,089
Coverage	0.11%
Acquired BBVAPR Accounted for under ASC 310-20 [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal	$ 926
Recorded Investment	678
Related allowance	$ 2
Coverage	0.00%
Acquired BBVAPR Accounted under ASC 310-30 [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal	$ 527,544
Recorded Investment	497,438
Related allowance	$ 17,036
Coverage	3.00%
Eurobank Acquired Loans
Financing Receivable, Impaired [Line Items]
Unpaid Principal	$ 70,266
Recorded Investment	66,508
Related allowance	$ 14,458
Coverage	0.22%
Commercial impaired loans with specific allowance [Member] | Originated Loan [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal	$ 33,454
Recorded Investment	28,555
Related allowance	$ 8,215
Coverage	0.29%
Commercial impaired loans with specific allowance [Member] | Acquired BBVAPR Accounted for under ASC 310-20 [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal	$ 926
Recorded Investment	678
Related allowance	$ 2
Coverage	0.00%
Residential impaired and troubled-debt restructuring [Member] | Originated Loan [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal	$ 78,666
Recorded Investment	71,196
Related allowance	$ 6,874
Coverage	0.10%
Commercial impaired loans with no specific allowance financing receivable | Originated Loan [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal	$ 39,109
Recorded Investment	$ 31,895
Coverage	0.00%
Commercial impaired loans with no specific allowance financing receivable | Acquired BBVAPR Accounted for under ASC 310-20 [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal	$ 0
Recorded Investment	$ 0
Coverage	0.00%
Mortgage impaired loan pool [Member] | Acquired BBVAPR Accounted under ASC 310-30 [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal	$ 400,964
Recorded Investment	411,531
Related allowance	$ 9,376
Coverage	2.00%
Mortgage impaired loan pool [Member] | Eurobank Acquired Loans
Financing Receivable, Impaired [Line Items]
Unpaid Principal	$ 53,090
Recorded Investment	49,366
Related allowance	$ 12,278
Coverage	0.25%
Commercial impaired loan pool [Member] | Acquired BBVAPR Accounted under ASC 310-30 [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal	$ 87,103
Recorded Investment	84,117
Related allowance	$ 6,713
Coverage	8.00%
Auto impaired loan pool. | Acquired BBVAPR Accounted under ASC 310-30 [Member]
Financing Receivable, Impaired [Line Items]
Unpaid Principal	$ 39,477
Recorded Investment	1,790
Related allowance	$ 947
Coverage	53.00%
Commercial and Other Construction Loan [Member] | Eurobank Acquired Loans
Financing Receivable, Impaired [Line Items]
Unpaid Principal	$ 17,176
Recorded Investment	17,142
Related allowance	$ 2,180
Coverage	0.13%

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Amount of investment in impaired financing receivables for which there is a related allowance for credit losses.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
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Unpaid principal balance of impaired financing receivables for which there is a related allowance for credit losses.

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Amount of allowance to cover probable credit losses on loans and leases. Includes carryover of or adjustments to the allowance for loan losses in connection with business combinations. Excludes allowance for loans and leases covered under loss sharing agreements.

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