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Fair Value Measurements Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Securities available for sale | $ 2,559,227 | $ 2,484,773
Equity securities |  |
Securities available for sale | 24,526 | 21,514
U.S. Government sponsored agency securities |  |
Securities available for sale | 134 | 25,136
State and municipal securities |  |
Securities available for sale | 391,641 | 262,765
Corporate debt securities |  |
Securities available for sale | 109,409 | 96,955
Collateralized mortgage obligations |  |
Securities available for sale | 593,860 | 821,509
Mortgage-backed securities |  |
Securities available for sale | 1,342,401 | 1,158,835
Auction rate securities |  |
Securities available for sale | 97,256 | 98,059
Fair Value, Measurements, Recurring |  |
Mortgage loans held for sale | 28,697 | 16,886
Securities available for sale | 2,559,227 | 2,484,773
Other financial assets | 61,592 | 50,594
Total assets | 2,649,516 | 2,552,253
Other financial liabilities | 58,766 | 48,924
Fair Value, Measurements, Recurring | Equity securities |  |
Securities available for sale | 24,526 | 21,514
Fair Value, Measurements, Recurring | U.S. Government sponsored agency securities |  |
Securities available for sale | 134 | 25,136
Fair Value, Measurements, Recurring | State and municipal securities |  |
Securities available for sale | 391,641 | 262,765
Fair Value, Measurements, Recurring | Corporate debt securities |  |
Securities available for sale | 109,409 | 96,955
Fair Value, Measurements, Recurring | Collateralized mortgage obligations |  |
Securities available for sale | 593,860 | 821,509
Fair Value, Measurements, Recurring | Mortgage-backed securities |  |
Securities available for sale | 1,342,401 | 1,158,835
Fair Value, Measurements, Recurring | Auction rate securities |  |
Securities available for sale | 97,256 | 98,059
Fair Value, Measurements, Recurring | Level 1 |  |
Mortgage loans held for sale | 0 | 0
Securities available for sale | 24,526 | 21,514
Other financial assets | 17,111 | 16,129
Total assets | 41,637 | 37,643
Other financial liabilities | 17,032 | 15,914
Fair Value, Measurements, Recurring | Level 1 | Equity securities |  |
Securities available for sale | 24,526 | 21,514
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 | 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 | 28,697 | 16,886
Securities available for sale | 2,434,573 | 2,361,864
Other financial assets | 44,481 | 34,465
Total assets | 2,507,751 | 2,413,215
Other financial liabilities | 41,734 | 33,010
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 | 134 | 25,136
Fair Value, Measurements, Recurring | Level 2 | State and municipal securities |  |
Securities available for sale | 391,641 | 262,765
Fair Value, Measurements, Recurring | Level 2 | Corporate debt securities |  |
Securities available for sale | 106,537 | 93,619
Fair Value, Measurements, Recurring | Level 2 | Collateralized mortgage obligations |  |
Securities available for sale | 593,860 | 821,509
Fair Value, Measurements, Recurring | Level 2 | Mortgage-backed securities |  |
Securities available for sale | 1,342,401 | 1,158,835
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 | 100,128 | 101,395
Other financial assets | 0 | 0
Total assets | 100,128 | 101,395
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 | 2,872 | 3,336
Fair Value, Measurements, Recurring | Level 3 | Collateralized mortgage obligations |  |
Securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Mortgage-backed securities |  |
Securities available for sale | 0 | 0
Fair Value, Measurements, Recurring | Level 3 | Auction rate securities |  |
Securities available for sale | $ 97,256 | $ 98,059

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