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Loans and Allowance for Loan Losses (Narrative) (Details) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 USD ($) agreement loan | Dec. 31, 2016 USD ($) loan | Dec. 31, 2015 USD ($) loan
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual loans | $ 252,800 | $ 317,970 |
TDRs both accruing and nonaccruing | 219,700 | 121,700 |
Post-Modification outstanding recorded investment | $ 177,070 | $ 132,234 | $ 5,107
Number of TDRs subsequently defaulted | loan | 0 | 4 | 0
Recorded investment |  | $ 20,800 |
Unfunded commitment to borrowers related to modified TDR | $ 7,300 | 6,800 |
TDRs and loans impaired with minimum aggregate relationship balances | 1,000 |  |
Loans covered by loss share agreement |  | 149,000 |
Related party balances of loans | 33,600 | 15,300 |
Related party new loans | 25,800 |  |
Related party repayments | 7,500 |  |
Loss on termination of loss share agreements | (6,603) |  |
Cash received from FDIC for final settlement of agreements | (3,234) |  |
Loans held for sale | 39,865 | 34,064 |
Short-term borrowings | 1,703,890 | 1,225,406 |
FHLB Borrowings [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Short-term borrowings | 1,132,567 | 865,000 |
Troubled Debt Restructurings [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Nonaccrual loans | 99,200 | 81,900 |
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 | 98,100 | 108,900 | $ 5,000
Troubled Debt Restructurings [Member] | Loans With Significant Covenant Waivers [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Convenant waivers | 76,200 | 22,800 |
Troubled Debt Restructurings [Member] | Loans With Other Modifications [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Other modifications | $ 2,800 | 500 | 100
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 | $ 15,087 | 12,351 |
Post-Modification outstanding recorded investment | 40 |  | $ 20
Real estate in process of foreclosure | 7,500 | 10,100 |
Real estate acquired through foreclosure | $ 3,400 | 3,100 |
Consumer [Member] | FDIC Loss Share Agreement [Member] |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |
Real estate in process of foreclosure |  | 4,900 |
Real estate acquired through foreclosure |  | $ 900 |

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