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Loans and the Allowance for Loan Losses (Details) - Loans held-for-sale - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Loans and the Allowance for Loan and Lease Losses (Details) - Purchase credit impaired loans [Line Items] |  |
Total carrying amount | $ 24,845 | $ 78,005
Commercial Portfolio Segment [Member] |  |
Loans and the Allowance for Loan and Lease Losses (Details) - Purchase credit impaired loans [Line Items] |  |
Total carrying amount |  | 70,105
Commercial Real Estate Portfolio Segment [Member] |  |
Loans and the Allowance for Loan and Lease Losses (Details) - Purchase credit impaired loans [Line Items] |  |
Total carrying amount | 24,475 | 7,712
Residential Portfolio Segment [Member] |  |
Loans and the Allowance for Loan and Lease Losses (Details) - Purchase credit impaired loans [Line Items] |  |
Total carrying amount | $ 370 | $ 188

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- Definition Cutstom Element. + References No definition available. + Details
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- Definition The face amount of loans that will be sold to other entities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
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