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Short-Term Borrowings (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Short-term Debt [Line Items] |  |
Short-term borrowings | $ 693,807 | $ 603,487
Federal Home Loan Bank And Federal Reserve Bank Amount Of Available Unused Funds | 7,330,000 |
Repurchase Agreements [Member] |  |
Short-term Debt [Line Items] |  |
Short-term borrowings | 586,171 | 590,772
Federal Home Loan Bank Advances [Member] |  |
Short-term Debt [Line Items] |  |
Short-term borrowings | 90,000 | 10,000
Federal Funds Purchased [Member] |  |
Short-term Debt [Line Items] |  |
Short-term borrowings | 2,551 | 2,551
Subordinated Debt Obligations [Member] |  |
Short-term Debt [Line Items] |  |
Short-term borrowings | 15,000 | 0
Unamortized Purchase Accounting Adjustments [Member] |  |
Short-term Debt [Line Items] |  |
Short-term borrowings | 85 | $ 164
Unsecured Debt [Member] |  |
Short-term Debt [Line Items] |  |
Line of Credit Facility, Remaining Borrowing Capacity | $ 665,000 |

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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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