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Loans and Allowance for Loan Losses (Narrative) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 USD ($) loan | Dec. 31, 2017 USD ($) loan | Dec. 31, 2016 USD ($) agreement loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual loans | $ 187,295 | $ 252,800 |
TDRs both accruing and nonaccruing | 224,600 | 219,700 |
Post-Modification outstanding recorded investment | 94,760 | 177,070 | $ 132,234
Recorded investment |  | 20,800 |
Unfunded commitment to borrowers related to modified TDR | 2,100 | 7,300 |
TDRs and loans impaired with minimum aggregate relationship balances | 1,000 |  |
Related party balances of loans | 37,500 | 33,600 |
Related party new loans | 16,300 |  |
Related party repayments | 12,300 |  |
Short-term borrowings | 1,589,128 | 1,703,890 |
FHLB Borrowings [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Short-term borrowings | 1,160,104 | 1,132,567 |
Troubled Debt Restructurings [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual loans | 85,500 | $ 99,200 |
Number of TDRs subsequently defaulted | loan |  | 0 |
Troubled Debt Restructurings [Member] | Loans With Extended Amortization Terms Or Other Payment Concessions [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Post-Modification outstanding recorded investment | 50,800 | $ 98,100 | 108,900
Troubled Debt Restructurings [Member] | Loans With Significant Covenant Waivers [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Convenant waivers | 14,600 | 76,200 | 22,800
Troubled Debt Restructurings [Member] | Loans With Other Modifications [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Other modifications | 29,400 | 2,800 | $ 500
FDIC Loss Share Agreement [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of loss share agreements | agreement |  |  | 1
Consumer [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual loans | 16,744 | 15,087 |
Post-Modification outstanding recorded investment | $ 455 | 40 |
Number of TDRs subsequently defaulted | loan | 1 |  |
Real estate in process of foreclosure | $ 7,100 | 7,500 |
Real estate acquired through foreclosure | 1,800 | 3,400 |
Consumer [Member] | Troubled Debt Restructurings [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Recorded investment | 100 |  |
Residential Mortgages [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual loans | 35,866 | 40,480 |
Post-Modification outstanding recorded investment | 1,297 | $ 2,812 | $ 694
Residential Mortgages [Member] | Troubled Debt Restructurings [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of TDRs subsequently defaulted | loan |  |  | 1
Recorded investment | $ 200 |  |
Commercial Non-Real Estate [Member] | Troubled Debt Restructurings [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of TDRs subsequently defaulted | loan |  |  | 4
Commercial Real Estate - Owner Occupied [Member] | Troubled Debt Restructurings [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Number of TDRs subsequently defaulted | loan | 1 |  |
Recorded investment | $ 1,800 |  |

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