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Allowance for Loan and Lease Losses | 12 Months Ended
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Dec. 31, 2017
Receivables [Abstract] |
Allowance for Loan and Lease Losses | The following tables provide information on non-PCI impaired loans and leases, exclusive of loans and leases evaluated collectively as a homogeneous group, including interest income recognized in the period during which the loans and leases were considered impaired.
| December 31, 2017
(Dollars in thousands) | With a recorded allowance |  | With no recorded allowance |  | Total |  | Unpaid principal balance |  | Related allowance recorded
Non-PCI impaired loans and leases |  |  |  |  |  |  |  |  |
Construction and land development - commercial | $ | 788 |  |  | $ | — |  |  | $ | 788 |  |  | $ | 1,110 |  |  | $ | 185 |
Commercial mortgage | 39,135 |  |  | 34,520 |  |  | 73,655 |  |  | 78,936 |  |  | 3,648 |
Other commercial real estate | 1,351 |  |  | 506 |  |  | 1,857 |  |  | 2,267 |  |  | 209 |
Commercial and industrial | 6,326 |  |  | 1,648 |  |  | 7,974 |  |  | 10,475 |  |  | 665 |
Lease financing | 1,890 |  |  | 24 |  |  | 1,914 |  |  | 2,571 |  |  | 397 |
Other | — |  |  | 521 |  |  | 521 |  |  | 521 |  |  | — |
Residential mortgage | 19,135 |  |  | 18,707 |  |  | 37,842 |  |  | 39,946 |  |  | 2,733 |
Revolving mortgage | 5,875 |  |  | 17,895 |  |  | 23,770 |  |  | 25,941 |  |  | 1,085 |
Construction and land development - noncommercial | 592 |  |  | 3,959 |  |  | 4,551 |  |  | 5,224 |  |  | 68 |
Consumer | 2,107 |  |  | 667 |  |  | 2,774 |  |  | 3,043 |  |  | 738 |
Total non-PCI impaired loans and leases | $ | 77,199 |  |  | $ | 78,447 |  |  | $ | 155,646 |  |  | $ | 170,034 |  |  | $ | 9,728 |
| December 31, 2016
(Dollars in thousands) | With a recorded allowance |  | With no recorded allowance |  | Total |  | Unpaid principal balance |  | Related allowance recorded
Non-PCI impaired loans and leases |  |  |  |  |  |  |  |  |
Construction and land development - commercial | $ | 1,002 |  |  | $ | 43 |  |  | $ | 1,045 |  |  | $ | 1,172 |  |  | $ | 151 |
Commercial mortgage | 42,875 |  |  | 33,486 |  |  | 76,361 |  |  | 82,658 |  |  | 3,488 |
Other commercial real estate | 1,279 |  |  | 284 |  |  | 1,563 |  |  | 1,880 |  |  | 152 |
Commercial and industrial | 8,920 |  |  | 3,680 |  |  | 12,600 |  |  | 16,637 |  |  | 1,732 |
Lease financing | 1,002 |  |  | 72 |  |  | 1,074 |  |  | 1,074 |  |  | 75 |
Other | 142 |  |  | — |  |  | 142 |  |  | 233 |  |  | 23 |
Residential mortgage | 20,269 |  |  | 11,207 |  |  | 31,476 |  |  | 32,588 |  |  | 2,447 |
Revolving mortgage | 1,825 |  |  | 5,788 |  |  | 7,613 |  |  | 8,831 |  |  | 366 |
Construction and land development - noncommercial | 645 |  |  | 1,968 |  |  | 2,613 |  |  | 3,030 |  |  | 109 |
Consumer | 1,532 |  |  | 380 |  |  | 1,912 |  |  | 2,086 |  |  | 667 |
Total non-PCI impaired loans and leases | $ | 79,491 |  |  | $ | 56,908 |  |  | $ | 136,399 |  |  | $ | 150,189 |  |  | $ | 9,210 |
Non-PCI impaired loans less than $500,000 that are collectively evaluated were $49.1 million and $47.4 million at December 31, 2017 and 2016, respectively. The following tables show the average non-PCI impaired loan balance and the interest income recognized by loan class for the years ended December 31, 2017, 2016 and 2015:
| Year ended December 31, 2017
(Dollars in thousands) | YTD Average Balance |  | YTD Interest Income Recognized
Non-PCI impaired loans and leases: |  |  |
Construction and land development - commercial | $ | 858 |  |  | $ | 37 |
Commercial mortgage | 73,815 |  |  | 2,596 |
Other commercial real estate | 1,642 |  |  | 34 |
Commercial and industrial | 9,847 |  |  | 376 |
Lease financing | 1,753 |  |  | 51 |
Other | 426 |  |  | 22 |
Residential mortgage | 33,818 |  |  | 990 |
Revolving mortgage | 14,022 |  |  | 436 |
Construction and land development - noncommercial | 3,383 |  |  | 145 |
Consumer | 2,169 |  |  | 103 |
Total non-PCI impaired loans and leases | $ | 141,733 |  |  | $ | 4,790 |
| Year ended December 31, 2016
Non-PCI impaired loans and leases: |  |  |
Construction and land development - commercial | $ | 2,700 |  |  | $ | 138 |
Commercial mortgage | 82,146 |  |  | 2,671 |
Other commercial real estate | 1,112 |  |  | 38 |
Commercial and industrial | 11,878 |  |  | 417 |
Lease financing | 1,307 |  |  | 63 |
Other | 687 |  |  | 33 |
Residential mortgage | 26,774 |  |  | 805 |
Revolving mortgage | 6,915 |  |  | 171 |
Construction and land development - noncommercial | 983 |  |  | 50 |
Consumer | 1,480 |  |  | 80 |
Total non-PCI impaired loans and leases | $ | 135,982 |  |  | $ | 4,466 |
| Year ended December 31, 2015
Non-PCI impaired loans and leases: |  |  |
Construction and land development - commercial | $ | 3,164 |  |  | $ | 146 |
Commercial mortgage | 89,934 |  |  | 3,129 |
Other commercial real estate | 481 |  |  | 12 |
Commercial and industrial | 14,587 |  |  | 510 |
Lease financing | 1,718 |  |  | 74 |
Other | 1,673 |  |  | 37 |
Residential mortgage | 18,524 |  |  | 557 |
Revolving mortgage | 4,368 |  |  | 97 |
Construction and land development - noncommercial | 829 |  |  | 38 |
Consumer | 1,126 |  |  | 75 |
Total non-PCI impaired loans and leases | $ | 136,404 |  |  | $ | 4,675 |

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- Definition Tabular disclosure of financing receivables (examples of financing receivables include loans, trade accounts receivable and notes receivable) and activity in the allowance for credit losses account. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 11B -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953423-111524 + Details
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