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Short-Term Borrowings (Tables) | 12 Months Ended
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Dec. 31, 2017
Debt Disclosure [Abstract] |
Composition of Short-Term Borrowings, Interest Expense and Weighted Average Interest Rate | The following table represents the composition of short-term borrowings, the weighted average interest rate as of December 31 and interest expense for the years ended December 31:
| 2017 |  | 2016 |  | 2015
(dollars in thousands) | Balance |  |  | Weighted Average Interest Rate |  |  | Interest Expense |  |  | Balance |  |  | Weighted Average Interest Rate |  |  | Interest Expense |  |  | Balance |  |  | Weighted Average Interest Rate |  |  | Interest Expense |
REPOs | $ | 50,161 |  |  | 0.39 | % |  | $ | 54 |  |  | $ | 50,832 |  |  | 0.01 | % |  | $ | 5 |  |  | $ | 62,086 |  |  | 0.01 | % |  | $ | 4 |
FHLB advances | 540,000 |  |  | 1.47 | % |  | 7,399 |  |  | 660,000 |  |  | 0.76 | % |  | 2,713 |  |  | 356,000 |  |  | 0.52 | % |  | 932 |
Total Short-term Borrowings | $ | 590,161 |  |  | 1.38 | % |  | $ | 7,453 |  |  | $ | 710,832 |  |  | 0.70 | % |  | $ | 2,718 |  |  | $ | 418,086 |  |  | 0.44 | % |  | $ | 936 |

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- Definition Tabular disclosure of short-term debt arrangements (having initial terms of repayment within one year or the normal operating cycle, if longer) including: (1) description of the short-term debt arrangement; (2) identification of the lender or type of lender; (3) repayment terms; (4) weighted average interest rate; (5) carrying amount of funds borrowed under the specified short-term debt arrangement as of the balance sheet date; (6) description of the refinancing of a short-term obligation when that obligation is excluded from current liabilities in the balance sheet; and (7) amount of a short-term obligation that has been excluded from current liabilities in the balance sheet because of a refinancing of the obligation. + 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) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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