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Loans and Allowance for Loan Losses (Narrative) (Details) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 USD ($) loan | Sep. 30, 2018 loan | Sep. 30, 2019 USD ($) loan | Sep. 30, 2018 USD ($) loan | Dec. 31, 2018 USD ($)
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Nonaccrual loans | $ 222,860 |  | $ 222,860 |  | $ 187,295
TDRs both accruing and nonaccruing | 162,000 |  | 162,000 |  | 224,600
Unfunded commitment to borrowers related to modified TDR | 2,000 |  | 2,000 |  | 2,100
TDRs and loans impaired with minimum aggregate relationship balances |  |  | 1,000 |  |
Consumer [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Nonaccrual loans | 16,874 |  | 16,874 |  | 16,744
Real estate in process of foreclosure | 8,900 |  | 8,900 |  | 7,100
Real estate acquired through foreclosure | 2,700 |  | 2,700 |  | 1,800
Troubled Debt Restructurings [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Nonaccrual loans | $ 101,100 |  | $ 101,100 |  | $ 85,500
Number of TDRs subsequently defaulted | loan | 0 | 0 | 0 | 0 |
Troubled Debt Restructurings [Member] | Commercial Non-Real Estate [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Equity securities |  |  | $ 6,800 |  |
Troubled Debt Restructurings [Member] | Loans With Extended Amortization Terms Or Other Payment Concessions [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Extended terms and other payment concessions |  |  | 600 | $ 50,700 |
Troubled Debt Restructurings [Member] | Loans With Significant Covenant Waivers [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Covenant waivers |  |  | 22,100 | 14,600 |
Troubled Debt Restructurings [Member] | Loans With Other Modifications [Member] |  |  |  |  |
Accounts Notes And Loans Receivable [Line Items] |  |  |  |  |
Other modifications |  |  | $ 7,400 | $ 29,100 |

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