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Fair Value Measurements on a Recurring Basis (Details) - Recurring Measurements - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Financial Assets |  |
Loans held for sale, at fair value | $ 37,058 | $ 38,833
Total assets measured at fair value on a recurring basis | 2,191,903 | 1,817,076
Financial Liabilities |  |
Total liabilities measured at fair value on a recurring basis | 4,110 | 9,389
Interest rate swaps |  |
Financial Liabilities |  |
Interest rate swaps | 4,110 | 9,389
U.S. government and federal agency |  |
Financial Assets |  |
Investment securities, available-for-sale | 29,352 | 31,127
U.S. government sponsored enterprises |  |
Financial Assets |  |
Investment securities, available-for-sale | 109,912 | 19,091
State and local governments |  |
Financial Assets |  |
Investment securities, available-for-sale | 643,111 | 629,501
Corporate bonds |  |
Financial Assets |  |
Investment securities, available-for-sale | 318,856 | 216,762
Residential mortgage-backed securities |  |
Financial Assets |  |
Investment securities, available-for-sale | 901,112 | 779,283
Commercial mortgage-backed securities |  |
Financial Assets |  |
Investment securities, available-for-sale | 152,502 | 102,479
Level 1 |  |
Financial Assets |  |
Loans held for sale, at fair value | 0 | 0
Total assets measured at fair value on a recurring basis | 0 | 0
Financial Liabilities |  |
Total liabilities measured at fair value on a recurring basis | 0 | 0
Level 1 | Interest rate swaps |  |
Financial Liabilities |  |
Interest rate swaps | 0 | 0
Level 1 | U.S. government and federal agency |  |
Financial Assets |  |
Investment securities, available-for-sale | 0 | 0
Level 1 | U.S. government sponsored enterprises |  |
Financial Assets |  |
Investment securities, available-for-sale | 0 | 0
Level 1 | State and local governments |  |
Financial Assets |  |
Investment securities, available-for-sale | 0 | 0
Level 1 | Corporate bonds |  |
Financial Assets |  |
Investment securities, available-for-sale | 0 | 0
Level 1 | Residential mortgage-backed securities |  |
Financial Assets |  |
Investment securities, available-for-sale | 0 | 0
Level 1 | Commercial mortgage-backed securities |  |
Financial Assets |  |
Investment securities, available-for-sale | 0 | 0
Level 2 |  |
Financial Assets |  |
Loans held for sale, at fair value | 37,058 | 38,833
Total assets measured at fair value on a recurring basis | 2,191,903 | 1,817,076
Financial Liabilities |  |
Total liabilities measured at fair value on a recurring basis | 4,110 | 9,389
Level 2 | Interest rate swaps |  |
Financial Liabilities |  |
Interest rate swaps | 4,110 | 9,389
Level 2 | U.S. government and federal agency |  |
Financial Assets |  |
Investment securities, available-for-sale | 29,352 | 31,127
Level 2 | U.S. government sponsored enterprises |  |
Financial Assets |  |
Investment securities, available-for-sale | 109,912 | 19,091
Level 2 | State and local governments |  |
Financial Assets |  |
Investment securities, available-for-sale | 643,111 | 629,501
Level 2 | Corporate bonds |  |
Financial Assets |  |
Investment securities, available-for-sale | 318,856 | 216,762
Level 2 | Residential mortgage-backed securities |  |
Financial Assets |  |
Investment securities, available-for-sale | 901,112 | 779,283
Level 2 | Commercial mortgage-backed securities |  |
Financial Assets |  |
Investment securities, available-for-sale | 152,502 | 102,479
Level 3 |  |
Financial Assets |  |
Loans held for sale, at fair value | 0 | 0
Total assets measured at fair value on a recurring basis | 0 | 0
Financial Liabilities |  |
Total liabilities measured at fair value on a recurring basis | 0 | 0
Level 3 | Interest rate swaps |  |
Financial Liabilities |  |
Interest rate swaps | 0 | 0
Level 3 | U.S. government and federal agency |  |
Financial Assets |  |
Investment securities, available-for-sale | 0 | 0
Level 3 | U.S. government sponsored enterprises |  |
Financial Assets |  |
Investment securities, available-for-sale | 0 | 0
Level 3 | State and local governments |  |
Financial Assets |  |
Investment securities, available-for-sale | 0 | 0
Level 3 | Corporate bonds |  |
Financial Assets |  |
Investment securities, available-for-sale | 0 | 0
Level 3 | Residential mortgage-backed securities |  |
Financial Assets |  |
Investment securities, available-for-sale | 0 | 0
Level 3 | Commercial mortgage-backed securities |  |
Financial Assets |  |
Investment securities, available-for-sale | $ 0 | $ 0

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