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Loans and Allowance for Loan Losses (Narrative) (Details) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Sep. 30, 2018 USD ($) loan | Sep. 30, 2017 USD ($) loan | Dec. 31, 2017 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Nonaccrual loans | $ 201,646,000 |  | $ 201,646,000 |  | $ 252,800,000
TDRs both accruing and nonaccruing | 254,900,000 |  | 254,900,000 |  | 219,700,000
Post-Modification outstanding recorded investment | 24,595,000 | $ 43,118,000 | 94,367,000 | $ 147,454,000 |
Unfunded commitment to borrowers related to modified TDR | 8,200,000 |  | 8,200,000 |  | 7,300,000
TDRs and loans impaired with minimum aggregate relationship balances |  |  | $ 1,000,000 |  |
Performing [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Period for which payments of principal and interest are past due |  |  | less than 90 days |  |
Troubled Debt Restructurings [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Nonaccrual loans | 92,700,000 |  | $ 92,700,000 |  | 99,200,000
Number of TDRs subsequently defaulted | loan |  |  | 1 | 0 |
Recorded investment |  |  | $ 200,000 |  |
Troubled Debt Restructurings [Member] | Loans With Extended Amortization Terms Or Other Payment Concessions [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Extended terms and other payment concessions |  |  | 50,700,000 | $ 96,100,000 |
Troubled Debt Restructurings [Member] | Loans With Significant Covenant Waivers [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Convenant waivers |  |  | 14,600,000 | 50,100,000 |
Troubled Debt Restructurings [Member] | Loans With Other Modifications [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Post-Modification outstanding recorded investment |  |  | 29,100,000 |  |
Other modifications |  |  |  | 1,300,000 |
Consumer [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Nonaccrual loans | 15,576,000 |  | 15,576,000 |  | 15,087,000
Post-Modification outstanding recorded investment | 89,000 |  | 311,000 | $ 42,000 |
Real estate in process of foreclosure | 6,900,000 |  | 6,900,000 |  | 7,500,000
Real estate acquired through foreclosure | $ 1,900,000 |  | $ 1,900,000 |  | $ 3,400,000

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- Definition Includes any additional disclosures related to the credit quality of financing receivables. This may include a description of a credit quality indicator or a description of how the internal risk ratings used by a company relate to the likelihood of loss. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 29 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953659-111524 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 30 -URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953664-111524 + Details
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