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Loans Receivable (Recorded Investment in loans individually evaluated for impairment) (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Financing Receivable, Impaired [Line Items] |  |
Allowance for loan and lease losses | $ 165,742 | $ 167,509
Originated Loan [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal | 175,716 | 174,915
Recorded Investment | 154,011 | 156,941
Allowance for loan and lease losses | $ 18,227 | $ 19,694
Coverage | 0.12% | 0.13%
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 | $ 4 | $ 20
Coverage | 0.01% | 0.03%
Acquired BBVAPR Accounted under ASC 310-30 [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal | $ 731,037 | $ 843,423
Recorded Investment | 713,484 | 818,303
Allowance for loan and lease losses | $ 43,875 | $ 45,755
Coverage | 0.06% | 0.06%
Eurobank Acquired Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal | $ 123,317 | $ 139,246
Recorded Investment | 114,051 | 123,335
Allowance for loan and lease losses | $ 24,281 | $ 25,174
Coverage | 0.21% | 0.20%
Commercial impaired loans with specific allowance [Member] | Originated Loan [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal | $ 38,650 | $ 57,922
Recorded Investment | 33,379 | 52,585
Allowance for loan and lease losses | $ 7,607 | $ 10,573
Coverage | 0.23% | 0.20%
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 | $ 4 | $ 20
Coverage | 0.01% | 0.03%
Residential troubled-debt restructuring impaired loans with specific allowance [Member] | Originated Loan [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal | $ 95,673 | $ 94,971
Recorded Investment | 85,119 | 85,403
Allowance for loan and lease losses | $ 10,620 | $ 9,121
Coverage | 0.12% | 0.11%
Commercial impaired loans with no specific allowance financing receivable | Originated Loan [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal | $ 41,393 | $ 22,022
Recorded Investment | $ 35,513 | $ 18,953
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 | $ 510,426 | $ 547,064
Recorded Investment | 503,860 | 532,052
Allowance for loan and lease losses | $ 15,258 | $ 14,085
Coverage | 0.03% | 0.03%
Commercial impaired loan pool [Member] | Acquired BBVAPR Accounted under ASC 310-30 [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal | $ 197,516 | $ 250,451
Recorded Investment | 189,164 | 241,124
Allowance for loan and lease losses | $ 22,256 | $ 23,691
Coverage | 0.12% | 0.10%
Auto impaired loan pool. | Acquired BBVAPR Accounted under ASC 310-30 [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal | $ 22,079 | $ 43,440
Recorded Investment | 20,364 | 43,696
Allowance for loan and lease losses | $ 6,343 | $ 7,961
Coverage | 0.31% | 0.18%
Consumer impaired loan pool. | Acquired BBVAPR Accounted under ASC 310-30 [Member] |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal | $ 1,016 | $ 2,468
Recorded Investment | 96 | 1,431
Allowance for loan and lease losses | $ 18 | $ 18
Coverage | 0.19% | 0.01%
Consumer impaired loan pool. | Eurobank Acquired Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal | $ 13 | $ 15
Recorded Investment | 4 | 4
Allowance for loan and lease losses | $ 4 | $ 4
Coverage | 1.00% | 1.00%
Loans secured by 1-4 family residential properties, covered [Member] | Eurobank Acquired Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal | $ 72,874 | $ 81,132
Recorded Investment | 64,785 | 69,538
Allowance for loan and lease losses | $ 15,155 | $ 15,187
Coverage | 0.23% | 0.22%
Commercial and Other Construction Loan [Member] | Eurobank Acquired Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Unpaid Principal | $ 50,430 | $ 58,099
Recorded Investment | 49,262 | 53,793
Allowance for loan and lease losses | $ 9,122 | $ 9,983
Coverage | 0.19% | 0.19%

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