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Loans and Allowance for Loan Losses (Narrative) (Details) $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) loan agreement | Mar. 31, 2017 USD ($) loan | Dec. 31, 2017 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual loans | $ 275,179 |  | $ 252,800
TDRs both accruing and nonaccruing | 284,500 |  | 219,700
Post-Modification outstanding recorded investment | $ 63,220 | $ 45,092 |
Number of TDRs subsequently defaulted | loan | 0 | 0 |
Unfunded commitment to borrowers related to modified TDR | $ 8,500 |  | 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 | $ 118,000 |  | 99,200
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 | 48,400 | $ 27,400 |
Troubled Debt Restructurings [Member] | Loans With Significant Covenant Waivers [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Convenant waivers | 14,600 | 10,700 |
Troubled Debt Restructurings [Member] | Loans With Other Modifications [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Post-Modification outstanding recorded investment | $ 200 |  |
Other modifications |  | $ 6,900 |
FDIC Loss Share Agreement [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of loss share agreements | agreement | 2 |  |
Consumer [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual loans | $ 14,163 |  | 15,087
Post-Modification outstanding recorded investment | 222 |  |
Real estate in process of foreclosure | 7,800 |  | 7,500
Real estate acquired through foreclosure | $ 3,700 |  | $ 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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