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Fair Value Measurements Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Securities available for sale | $ 2,547,956 | $ 2,559,227
Equity securities |  |
Securities available for sale | 918 | 24,526
U.S. Government sponsored agency securities |  |
Securities available for sale | 5,938 | 134
State and municipal securities |  |
Securities available for sale | 408,949 | 391,641
Corporate debt securities |  |
Securities available for sale | 97,309 | 109,409
Collateralized mortgage obligations |  |
Securities available for sale | 602,623 | 593,860
Residential mortgage-backed securities |  |
Securities available for sale | 1,120,796 | 1,317,838
Residential mortgage-backed securities |  |
Securities available for sale | 212,755 | 24,563
Auction rate securities |  |
Securities available for sale | 98,668 | 97,256
Fair Value, Measurements, Recurring |  |
Mortgage loans held for sale | 31,530 | 28,697
Securities available for sale | 2,547,956 | 2,559,227
Other financial assets | 63,990 | 61,592
Total assets | 2,643,476 | 2,649,516
Other financial liabilities | 58,371 | 58,766
Fair Value, Measurements, Recurring | Equity securities |  |
Securities available for sale | 918 | 24,526
Fair Value, Measurements, Recurring | U.S. Government sponsored agency securities |  |
Securities available for sale | 5,938 | 134
Fair Value, Measurements, Recurring | State and municipal securities |  |
Securities available for sale | 408,949 | 391,641
Fair Value, Measurements, Recurring | Corporate debt securities |  |
Securities available for sale | 97,309 | 109,409
Fair Value, Measurements, Recurring | Collateralized mortgage obligations |  |
Securities available for sale | 602,623 | 593,860
Fair Value, Measurements, Recurring | Residential mortgage-backed securities |  |
Securities available for sale | 1,120,796 | 1,317,838
Fair Value, Measurements, Recurring | Residential mortgage-backed securities |  |
Securities available for sale | 212,755 | 24,563
Fair Value, Measurements, Recurring | Auction rate securities |  |
Securities available for sale | 98,668 | 97,256
Fair Value, Measurements, Recurring | Level 1 |  |
Mortgage loans held for sale | 0 | 0
Securities available for sale | 918 | 24,526
Other financial assets | 19,451 | 17,111
Total assets | 20,369 | 41,637
Other financial liabilities | 19,357 | 17,032
Fair Value, Measurements, Recurring | Level 1 | Equity securities |  |
Securities available for sale | 918 | 24,526
Fair Value, Measurements, Recurring | Level 1 | U.S. Government sponsored agency securities |  |
Securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | State and municipal securities |  |
Securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Corporate debt securities |  |
Securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Collateralized mortgage obligations |  |
Securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Residential mortgage-backed securities |  |
Securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Residential mortgage-backed securities |  |
Securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Level 1 | Auction rate securities |  |
Securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Level 2 |  |
Mortgage loans held for sale | 31,530 | 28,697
Securities available for sale | 2,444,613 | 2,434,573
Other financial assets | 44,539 | 44,481
Total assets | 2,520,682 | 2,507,751
Other financial liabilities | 39,014 | 41,734
Fair Value, Measurements, Recurring | Level 2 | Equity securities |  |
Securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Level 2 | U.S. Government sponsored agency securities |  |
Securities available for sale | 5,938 | 134
Fair Value, Measurements, Recurring | Level 2 | State and municipal securities |  |
Securities available for sale | 408,949 | 391,641
Fair Value, Measurements, Recurring | Level 2 | Corporate debt securities |  |
Securities available for sale | 93,552 | 106,537
Fair Value, Measurements, Recurring | Level 2 | Collateralized mortgage obligations |  |
Securities available for sale | 602,623 | 593,860
Fair Value, Measurements, Recurring | Level 2 | Residential mortgage-backed securities |  |
Securities available for sale | 1,120,796 | 1,317,838
Fair Value, Measurements, Recurring | Level 2 | Residential mortgage-backed securities |  |
Securities available for sale | 212,755 | 24,563
Fair Value, Measurements, Recurring | Level 2 | Auction rate securities |  |
Securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Level 3 |  |
Mortgage loans held for sale | 0 | 0
Securities available for sale | 102,425 | 100,128
Other financial assets | 0 | 0
Total assets | 102,425 | 100,128
Other financial liabilities | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Equity securities |  |
Securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | U.S. Government sponsored agency securities |  |
Securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | State and municipal securities |  |
Securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Corporate debt securities |  |
Securities available for sale | 3,757 | 2,872
Fair Value, Measurements, Recurring | Level 3 | Collateralized mortgage obligations |  |
Securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Residential mortgage-backed securities |  |
Securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Residential mortgage-backed securities |  |
Securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Auction rate securities |  |
Securities available for sale | $ 98,668 | $ 97,256

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