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Loans and the Allowance for Loan Losses (Details) - Loans receivable on nonaccrual status - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
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Loans and the Allowance for Loan and Lease Losses (Details) - Loans receivable on nonaccrual status [Line Items] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | $ 49,715 | $ 65,613
Commercial Portfolio Segment [Member] |  |
Loans and the Allowance for Loan and Lease Losses (Details) - Loans receivable on nonaccrual status [Line Items] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 29,205 | 47,363
Commercial Real Estate Portfolio Segment [Member] |  |
Loans and the Allowance for Loan and Lease Losses (Details) - Loans receivable on nonaccrual status [Line Items] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | 15,657 | 12,757
Residential Real Estate Portfolio Segment [Member] |  |
Loans and the Allowance for Loan and Lease Losses (Details) - Loans receivable on nonaccrual status [Line Items] |  |
Financing Receivable, Recorded Investment, Nonaccrual Status | $ 4,853 | $ 5,493

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- Definition Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524 + Details
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