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Loans (Narrative) (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2016 USD ($) contract agreement | Dec. 31, 2015 USD ($) contract
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans | $ 317,970 | $ 159,713
TDRs both accruing and nonaccruing | 121,700 | 13,100
Post-Modification outstanding recorded investment | $ 132,234 | $ 5,107
Number of TDRs subsequently defaulted | contract | 0 | 0
TDRs and loans impaired with minimum aggregate relationship balances | $ 1,000 |
Recovery period | 3 years |
Percentage of recoveries on reimbursed losses due to FDIC | 80.00% |
Loans covered by loss share agreement | $ 149,000 |
Real estate acquired through foreclosure | 18,884 | $ 26,256
Related party balances of loans | 15,300 | 17,400
Related party new loans | 25,500 |
Related party repayments | 27,600 |
Loans held for sale | 34,064 | 20,434
Short-term borrowings | 1,225,406 | 1,423,644
FHLB Borrowings [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Short-term borrowings | 865,000 | 900,000
Troubled Debt Restructurings [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Nonaccrual loans | 81,900 | 8,800
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 | 108,900 | 5,000
Troubled Debt Restructurings [Member] | Loans With Significant Covenant Waivers [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Post-Modification outstanding recorded investment | 22,800 |
Troubled Debt Restructurings [Member] | Loans With Other Modifications [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Post-Modification outstanding recorded investment | $ 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 | $ 12,351 | 9,061
Post-Modification outstanding recorded investment |  | 20
Real estate in process of foreclosure | 10,100 | 7,400
Real estate acquired through foreclosure | 3,100 | 9,300
Consumer [Member] | FDIC Loss Share Agreement [Member] |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Real estate in process of foreclosure | 4,900 | 4,100
Real estate acquired through foreclosure | $ 900 | $ 1,600

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