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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%