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Loans and Allowance for Loan Losses (Narrative) (Details) $ in Thousands | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) contract agreement | Jun. 30, 2016 USD ($) contract | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Nonaccrual loans | $ 238,219 | $ 238,219 |  | $ 317,970 |
TDRs both accruing and nonaccruing | 186,800 | 186,800 |  | 121,700 |
Post-Modification outstanding recorded investment |  | $ 104,336 | $ 58,347 |  |
Number of TDRs subsequently defaulted | contract |  | 0 | 0 |  |
TDRs and loans impaired with minimum aggregate relationship balances |  | $ 1,000 |  |  |
Loans receivable | 18,473,841 | 18,473,841 | $ 16,035,796 | 16,752,151 |
Loans receivable | 154,000 | 154,000 |  |  |
Real estate acquired through foreclosure | 17,996 | 17,996 |  | 18,884 |
Loans held for sale | 26,787 | 26,787 |  | 34,064 |
Short-term borrowings | 1,810,907 | 1,810,907 |  | 1,225,406 |
Write-down for termination of FDIC loss share agreement | 6,603 | 6,603 |  |  |
Settlement amount | 3,234 | $ 3,234 | 21,075 | 16,219 | $ 29,868
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 | 96,300 | $ 96,300 |  | 81,900 |
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 |  | 28,400 | 31,000 |  |
Troubled Debt Restructurings [Member] | Loans With Significant Covenant Waivers [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Convenant waivers |  | 40,200 |  |  |
Troubled Debt Restructurings [Member] | Loans With Other Modifications [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Post-Modification outstanding recorded investment |  | $ 35,700 |  |  |
Other Modifications |  |  | 27,300 |  |
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 | 14,342 | $ 14,342 |  | 12,351 |
Post-Modification outstanding recorded investment |  | 42 |  |  |
Loans receivable | 2,093,287 | 2,093,287 | $ 2,064,368 | 2,059,931 |
Real estate in process of foreclosure | 4,200 | 4,200 |  | 10,100 |
Real estate acquired through foreclosure | 2,700 | 2,700 |  | 3,100 |
Consumer [Member] | Performing [Member] |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Loans receivable | $ 2,078,857 | $ 2,078,857 |  | $ 2,046,757 |

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