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Short-term Borrowings (Tables) | 12 Months Ended
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Dec. 31, 2015
Short-term Debt [Abstract] |
Summary of Short-Term Borrowings | Short-term borrowings at December 31 were as follows:
| 2015 |  | 2014 |  | 2013
| Ending Balance |  | Average Balance |  | Average Rate |  | Ending Balance |  | Average Balance |  | Average Rate |  | Ending Balance |  | Average Balance |  | Average Rate
| (dollars in thousands)
Federal funds purchased | $ | 4,000 |  |  | $ | 14,832 |  |  | 0.36 | % |  | $ | 9,000 |  |  | $ | 11,691 |  |  | 0.36 | % |  | $ | 16,000 |  |  | $ | 11,982 |  |  | 0.36 | %
Borrowings from FHLB | 1,400,000 |  |  | 1,117,522 |  |  | 0.42 |  |  | 945,000 |  |  | 644,651 |  |  | 0.31 |  |  | 478,100 |  |  | 335,449 |  |  | 0.27 |
Securities sold under agreements to repurchase | 106,825 |  |  | 120,177 |  |  | 0.23 |  |  | 151,876 |  |  | 159,051 |  |  | 0.24 |  |  | 132,515 |  |  | 130,957 |  |  | 0.25 |
Total | $ | 1,510,825 |  |  | $ | 1,252,531 |  |  | 0.40 |  |  | $ | 1,105,876 |  |  | $ | 815,393 |  |  | 0.30 |  |  | $ | 626,615 |  |  | $ | 478,388 |  |  | 0.26 |
Maximum total at any month-end | $ | 1,510,825 |  |  |  |  |  |  | $ | 1,105,876 |  |  |  |  |  |  | $ | 626,615 |  |  |  |  |
Weighted average rate at year-end |  |  |  |  | 0.53 | % |  |  |  |  |  | 0.30 | % |  |  |  |  |  | 0.27 | %
Interest Expense on Short-Term Borrowings | Interest expense on short-term borrowings for the years ended December 31 is detailed below:
| 2015 |  | 2014 |  | 2013
| (dollars in thousands)
Federal funds purchased | $ | 54 |  |  | $ | 42 |  |  | $ | 43 |
Borrowings from FHLB | 4,684 |  |  | 2,019 |  |  | 893 |
Securities sold under agreements to repurchase | 280 |  |  | 388 |  |  | 326 |
Total interest on short-term borrowings | $ | 5,018 |  |  | $ | 2,449 |  |  | $ | 1,262 |

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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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 02 -Paragraph 19 -Article 5 + Details
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