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Fair Value Measurements - Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Liability beginning balance $ 683 $ 3,833 $ 1,222 $ 3,653
Total realized and unrealized gains (losses) 496 645 1,035 465
Liability ending balance 187 3,188 187 3,188
Investments [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Asset beginning balance 9,114 8,779 9,508 5,946
Total realized and unrealized gains (losses) (427) (254) (812) (341)
Purchases and issuances 29 180 417 4,444
Sales and settlements (83) (282) (369) (1,006)
Transfers in (out)     (111) (620)
Asset ending balance 8,633 8,423 8,633 8,423
Interest Rate Lock Commitments [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Asset beginning balance 5,060 10,528 7,576 2,375
Total realized and unrealized gains (losses) 5,748 (5,017) 3,232 3,136
Asset ending balance 10,808 5,511 10,808 5,511
Auction Rate Securities [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Asset beginning balance 100,384 92,548 91,422 85,124
Total realized and unrealized gains (losses) 1,799 (645) 1,736 (971)
Purchases and issuances 5,600 2,375 16,325 16,550
Sales and settlements (11,300) (6,955) (13,000) (13,380)
Asset ending balance 96,483 87,323 96,483 87,323
Auction Rate Securities Purchase Commitment [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Liability beginning balance 1,034 1,514 902 2,600
Total realized and unrealized gains (losses) 557 477 425 1,563
Liability ending balance 477 1,037 477 1,037
Municipal Obligations [Member]        
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]        
Asset beginning balance 62 52 164 236
Total realized and unrealized gains (losses) 3 77 (79) (107)
Sales and settlements     (20)  
Asset ending balance $ 65 $ 129 $ 65 $ 129