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Allowance for Loan and Lease Losses - Recorded Investment and Related Allowance (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Originated Loans and Leases |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment With No Related Allowance | $ 13,530 | $ 11,837
Unpaid Principal Balance With No Related Allowance | 13,905 | 11,925
Recorded Investment With Related Allowance | 1,377 | 513
Unpaid Principal Balance With Related Allowance | 1,377 | 532
Related Allowance | 471 | 441
Carrying amount | 14,907 | 12,350
Outstanding principal balance | 15,282 | 12,457
Total Acquired Loans |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment With No Related Allowance | 3,662 | 3,421
Unpaid Principal Balance With No Related Allowance | 3,795 | 3,554
Recorded Investment With Related Allowance | 25 | 50
Unpaid Principal Balance With Related Allowance | 25 | 50
Related Allowance | 25 | 25
Carrying amount | 3,687 | 3,471
Outstanding principal balance | 3,820 | 3,604
Commercial and industrial | Originated Loans and Leases | Commercial and industrial other |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment With No Related Allowance | 3,078 | 1,246
Unpaid Principal Balance With No Related Allowance | 3,078 | 1,250
Recorded Investment With Related Allowance | 1,352 | 513
Unpaid Principal Balance With Related Allowance | 1,352 | 532
Related Allowance | 446 | 441
Commercial and industrial | Total Acquired Loans | Commercial and industrial other |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment With No Related Allowance | 281 | 226
Unpaid Principal Balance With No Related Allowance | 373 | 226
Recorded Investment With Related Allowance | 25 | 50
Unpaid Principal Balance With Related Allowance | 25 | 50
Related Allowance | 25 | 25
Commercial real estate | Originated Loans and Leases | Commercial and industrial other |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment With No Related Allowance | 6,456 | 6,626
Unpaid Principal Balance With No Related Allowance | 6,656 | 6,626
Recorded Investment With Related Allowance | 25 | 0
Unpaid Principal Balance With Related Allowance | 25 | 0
Related Allowance | 25 | 0
Commercial real estate | Total Acquired Loans | Commercial and industrial other |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment With No Related Allowance | 1,588 | 1,372
Unpaid Principal Balance With No Related Allowance | 1,598 | 1,474
Residential real estate | Originated Loans and Leases | Home equity |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment With No Related Allowance | 3,996 | 3,965
Unpaid Principal Balance With No Related Allowance | 4,171 | 4,049
Residential real estate | Total Acquired Loans | Home equity |  |
Financing Receivable, Impaired [Line Items] |  |
Recorded Investment With No Related Allowance | 1,793 | 1,823
Unpaid Principal Balance With No Related Allowance | $ 1,824 | $ 1,854

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- Definition Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953550-111524 + Details
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