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Loans (Recorded Investment in loans individually evaluated for impairment) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2019 | Dec. 31, 2018
Financing Receivable, Impaired [Line Items] |  |
Allowance for loan and lease losses | $ 162,488 | $ 164,231
Originated Loan [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal | 195,330 | 188,536
Recorded Investment | 172,021 | 165,403
Allowance for loan and lease losses | $ 21,963 | $ 18,620
Coverage | 0.13% | 0.11%
Acquired BBVAPR Accounted for under ASC 310-20 [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal | $ 926 | $ 926
Recorded Investment | 747 | 747
Allowance for loan and lease losses | $ 24 | $ 14
Coverage | 0.03% | 0.02%
Acquired BBVAPR Accounted under ASC 310-30 [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal | $ 662,586 | $ 701,501
Recorded Investment | 651,125 | 688,083
Allowance for loan and lease losses | $ 42,133 | $ 42,010
Coverage | 6.00% | 6.00%
Eurobank Acquired Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal | $ 105,160 | $ 117,510
Recorded Investment | 99,961 | 111,230
Allowance for loan and lease losses | $ 24,352 | $ 24,971
Coverage | 0.24% | 0.22%
Commercial impaired loans with specific allowance [Member] | Originated Loan [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal | $ 61,854 | $ 54,636
Recorded Investment | 56,408 | 49,092
Allowance for loan and lease losses | $ 10,828 | $ 8,434
Coverage | 0.19% | 0.17%
Commercial impaired loans with specific allowance [Member] | Acquired BBVAPR Accounted for under ASC 310-20 [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal | $ 926 | $ 926
Recorded Investment | 747 | 747
Allowance for loan and lease losses | $ 24 | $ 14
Coverage | 0.03% | 0.02%
Residential troubled-debt restructuring impaired loans with specific allowance [Member] | Originated Loan [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal | $ 94,964 | $ 95,659
Recorded Investment | 83,406 | 84,174
Allowance for loan and lease losses | $ 11,135 | $ 10,186
Coverage | 0.13% | 0.12%
Commercial impaired loans with no specific allowance financing receivable | Originated Loan [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal | $ 38,512 | $ 38,241
Recorded Investment | $ 32,207 | $ 32,137
Coverage | 0.00% | 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 | $ 0
Recorded Investment | $ 0 | $ 0
Coverage | 0.00% | 0.00%
Mortgage impaired loan pool [Member] | Acquired BBVAPR Accounted under ASC 310-30 [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal | $ 489,638 | $ 498,537
Recorded Investment | 484,577 | 492,890
Allowance for loan and lease losses | $ 17,901 | $ 15,225
Coverage | 4.00% | 3.00%
Commercial impaired loan pool [Member] | Acquired BBVAPR Accounted under ASC 310-30 [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal | $ 162,612 | $ 188,413
Recorded Investment | 156,682 | 180,790
Allowance for loan and lease losses | $ 20,733 | $ 20,641
Coverage | 13.00% | 11.00%
Auto impaired loan pool. | Acquired BBVAPR Accounted under ASC 310-30 [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal | $ 10,336 | $ 14,551
Recorded Investment | 9,866 | 14,403
Allowance for loan and lease losses | $ 3,499 | $ 6,144
Coverage | 35.00% | 43.00%
Consumer impaired loan pool. | Eurobank Acquired Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal |  | $ 15
Recorded Investment |  | 4
Allowance for loan and lease losses |  | $ 4
Coverage |  | 1.00%
Loans secured by 1-4 family residential properties, covered [Member] | Eurobank Acquired Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal | $ 66,713 | $ 70,153
Recorded Investment | 60,642 | 63,406
Allowance for loan and lease losses | $ 15,110 | $ 15,382
Coverage | 0.25% | 0.24%
Commercial and Other Construction Loan [Member] | Eurobank Acquired Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal | $ 38,447 | $ 47,342
Recorded Investment | 39,319 | 47,820
Allowance for loan and lease losses | $ 9,242 | $ 9,585
Coverage | 0.24% | 0.20%

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