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Investment Securities - Pledged Securities and Concentration (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Pledged securities    
Total pledged securities $ 2,700,000 $ 3,100,000
Securities pledged to secure public deposits and repurchase transactions 2,500,000 2,900,000
Securities pledged to secure other financial transactions 209,100 206,300
Non-government issuer    
Concentration of risk    
Securities of issuers in excess of 10% of stockholders' equity $ 0 $ 0