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Short-Term Borrowings (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Short-term Debt [Line Items] |  |  |
Balance at year-end | $ 442,481 | $ 316,802 |
FHLB, unused lines of credit available for short-term financing | 2,000,000 | 1,800,000 |
Federal Funds Purchased [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Balance at year-end | 99,500 | 68,000 | $ 130,000
Average during the year | 97,424 | 110,154 | 39,907
Maximum month end balance | $ 159,000 | $ 183,000 | $ 130,000
Weighted average rate during the year | 0.36% | 0.29% | 0.26%
Weighted average rate at December 31 | 0.51% | 0.34% | 0.18%
Securities Sold under Repurchase Agreements [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Balance at year-end | $ 167,981 | $ 148,802 | $ 176,042
Average during the year | 162,201 | 165,858 | 169,352
Maximum month end balance | $ 178,326 | $ 182,861 | $ 185,871
Weighted average rate during the year | 0.06% | 0.06% | 0.06%
Weighted average rate at December 31 | 0.06% | 0.06% | 0.05%
Other Short-Term Borrowings [Member] |  |  |
Short-term Debt [Line Items] |  |  |
Balance at year-end | $ 175,000 | $ 100,000 | $ 150,000
Average during the year | 80,260 | 106,438 | 71,589
Maximum month end balance | $ 175,000 | $ 320,000 | $ 210,000
Weighted average rate during the year | 0.42% | 0.40% | 0.43%
Weighted average rate at December 31 | 0.56% | 0.36% | 0.55%

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