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Purchased Credit Impaired ("PCI") Loans (Tables) | 12 Months Ended
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Dec. 31, 2017
Covered Loans [Line Items] |
Rollforward of PCI Loans, Net of Allowance for Loan Losses | The following table is a rollforward of PCI loans, net of the allowance for loan losses, for the years ended December 31, 2017 and 2016.
(in thousands) | Contractual Cashflows |  | Non-accretable Difference |  | Accretable Yield |  | Carrying Amount
Balance January 1, 2017 | $ | 66,003 |  |  | $ | 18,902 |  |  | $ | 13,176 |  |  | $ | 33,925 |
Acquisitions | 68,763 |  |  | 14,296 |  |  | 5,312 |  |  | 49,155 |
Principal reductions and interest payments | (24,530 | ) |  | — |  |  | — |  |  | (24,530 | )
Accretion of loan discount | — |  |  | — |  |  | (7,573 | ) |  | 7,573 |
Changes in contractual and expected cash flows due to remeasurement | 13,978 |  |  | (1,465 | ) |  | 5,486 |  |  | 9,957 |
Reductions due to disposals | (11,503 | ) |  | (2,727 | ) |  | (2,439 | ) |  | (6,337 | )
Balance December 31, 2017 | $ | 112,711 |  |  | $ | 29,006 |  |  | $ | 13,962 |  |  | $ | 69,743 |
Balance January 1, 2016 | $ | 116,689 |  |  | $ | 26,765 |  |  | $ | 25,341 |  |  | $ | 64,583 |
Principal reductions and interest payments | (25,669 | ) |  | — |  |  | — |  |  | (25,669 | )
Accretion of loan discount | — |  |  | — |  |  | (6,155 | ) |  | 6,155 |
Changes in contractual and expected cash flows due to remeasurement | 11,718 |  |  | 766 |  |  | (1,500 | ) |  | 12,452 |
Reductions due to disposals | (36,735 | ) |  | (8,629 | ) |  | (4,510 | ) |  | (23,596 | )
Balance December 31, 2016 | $ | 66,003 |  |  | $ | 18,902 |  |  | $ | 13,176 |  |  | $ | 33,925 |
The accretable yield is recognized in interest income over the estimated life of the acquired loans using the effective yield method.
Covered Loans |
Covered Loans [Line Items] |
Summary of PCI Loans by Category | Below is a summary of PCI loans by category at December 31, 2017 and 2016:
| December 31, 2017 |  | December 31, 2016
($ in thousands) | Weighted- Average Risk Rating 1 | Recorded Investment PCI Loans |  | Weighted- Average Risk Rating 1 | Recorded Investment PCI Loans
Commercial and industrial | 6.38 | $ | 3,212 |  |  | 5.87 | $ | 3,523 |
Real estate loans: |  |  |  |  |
Commercial - investor owned | 7.36 | 42,887 |  |  | 6.95 | 8,162 |
Commercial - owner occupied | 6.48 | 11,332 |  |  | 6.39 | 11,863 |
Construction and land development | 5.99 | 5,883 |  |  | 5.80 | 4,365 |
Residential | 5.99 | 10,781 |  |  | 5.64 | 11,792 |
Total real estate loans |  | 70,883 |  |  |  | 36,182 |
Consumer and other | 2.84 | 59 |  |  | 1.64 | 64 |
Purchased credit impaired loans |  | $ | 74,154 |  |  |  | $ | 39,769 |
(1) Risk ratings are based on the borrower's contractual obligation, which is not reflective of the purchase discount.
Summary of Aging of Recorded Investment in Past Due PCI Loans by Portfolio Class and Category | The aging of the recorded investment in past due PCI loans by portfolio class and category at December 31, 2017 and 2016 is shown below:
| December 31, 2017
(in thousands) | 30-89 Days Past Due |  | 90 or More Days Past Due |  | Total Past Due |  | Current |  | Total
Commercial and industrial | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 3,212 |  |  | $ | 3,212 |
Real estate: |  |  |  |  |  |  |  |  |
Commercial - investor owned | — |  |  | 3,034 |  |  | 3,034 |  |  | 39,853 |  |  | 42,887 |
Commercial - owner occupied | — |  |  | 673 |  |  | 673 |  |  | 10,659 |  |  | 11,332 |
Construction and land development | — |  |  | — |  |  | — |  |  | 5,883 |  |  | 5,883 |
Residential | 328 |  |  | 255 |  |  | 583 |  |  | 10,198 |  |  | 10,781 |
Consumer and other | — |  |  | — |  |  | — |  |  | 59 |  |  | 59 |
Total | $ | 328 |  |  | $ | 3,962 |  |  | $ | 4,290 |  |  | $ | 69,864 |  |  | $ | 74,154 |
| December 31, 2016
(in thousands) | 30-89 Days Past Due |  | 90 or More Days Past Due |  | Total Past Due |  | Current |  | Total
Commercial and industrial | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 3,523 |  |  | $ | 3,523 |
Real estate: |  |  |  |  |  |  |  |  |
Commercial - investor owned | — |  |  | — |  |  | — |  |  | 8,162 |  |  | 8,162 |
Commercial - owner occupied | — |  |  | — |  |  | — |  |  | 11,863 |  |  | 11,863 |
Construction and land development | — |  |  | — |  |  | — |  |  | 4,365 |  |  | 4,365 |
Residential | 169 |  |  | 51 |  |  | 220 |  |  | 11,572 |  |  | 11,792 |
Consumer and other | — |  |  | — |  |  | — |  |  | 64 |  |  | 64 |
Total | $ | 169 |  |  | $ | 51 |  |  | $ | 220 |  |  | $ | 39,549 |  |  | $ | 39,769 |

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- Definition Tabular disclosure of financing receivables that are past due but not impaired, financing receivables that are 90 days past due and still accruing, and financing receivables on nonaccrual status. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953401-111524 + Details
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