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Loans and Allowance for Loan Losses (Narrative) (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2018 USD ($) loan | Jun. 30, 2017 USD ($) loan | Jun. 30, 2018 USD ($) loan | Jun. 30, 2017 USD ($) loan | Dec. 31, 2017 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Nonaccrual loans | $ 241,681 |  | $ 241,681 |  | $ 252,800
TDRs both accruing and nonaccruing | 251,300 |  | 251,300 |  | 219,700
Post-Modification outstanding recorded investment | 6,552 | $ 59,244 | 69,772 | $ 104,336 |
Number of TDRs subsequently defaulted | loan |  | 0 |  | 0 |
Unfunded commitment to borrowers related to modified TDR | 9,700 |  | 9,700 |  | 7,300
TDRs and loans impaired with minimum aggregate relationship balances |  |  | $ 1,000 |  |
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 | $ 98,800 |  | $ 98,800 |  | 99,200
Number of TDRs subsequently defaulted | loan | 1 |  | 1 |  |
Recorded investment | $ 200 |  | $ 200 |  |
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 |  |  | 49,600 | $ 28,400 |
Troubled Debt Restructurings [Member] | Loans With Significant Covenant Waivers [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Convenant waivers |  |  | 14,600 | 40,200 |
Troubled Debt Restructurings [Member] | Loans With Other Modifications [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Post-Modification outstanding recorded investment |  |  | 5,600 |  |
Other modifications |  |  |  | 35,700 |
Consumer [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Nonaccrual loans | 14,347 |  | 14,347 |  | 15,087
Post-Modification outstanding recorded investment |  | $ 42 | 222 | $ 42 |
Real estate in process of foreclosure | 6,200 |  | 6,200 |  | 7,500
Real estate acquired through foreclosure | $ 2,500 |  | $ 2,500 |  | $ 3,400

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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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