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Fair Value - Assets and Liabilities Recorded at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Assets |  |
Investment securities | $ 4,842,551 | $ 5,234,658
Fair Value Measurements, Recurring |  |
Assets |  |
Investment securities | 4,842,551 | 5,234,658
Other assets | 5,384 | 14,682
Liabilities |  |
Other liabilities | (27,427) | (20,488)
Total |  |
Net Assets (Liabilities) | 4,820,508 | 5,228,852
Fair Value Measurements, Recurring | Level 2 |  |
Assets |  |
Investment securities | 4,842,551 | 5,234,658
Other assets | 5,384 | 14,682
Liabilities |  |
Other liabilities | (23,313) | (15,049)
Total |  |
Net Assets (Liabilities) | 4,824,622 | 5,234,291
Fair Value Measurements, Recurring | Level 3 |  |
Liabilities |  |
Other liabilities | (4,114) | (5,439)
Total |  |
Net Assets (Liabilities) | (4,114) | (5,439)
U.S. Treasury securities |  |
Assets |  |
Investment securities | 386,057 | 392,255
U.S. Treasury securities | Fair Value Measurements, Recurring |  |
Assets |  |
Investment securities | 386,057 | 392,255
U.S. Treasury securities | Fair Value Measurements, Recurring | Level 2 |  |
Assets |  |
Investment securities | 386,057 | 392,255
Government-sponsored enterprises debt securities |  |
Assets |  |
Investment securities | 238,527 | 242,601
Government-sponsored enterprises debt securities | Fair Value Measurements, Recurring |  |
Assets |  |
Investment securities | 238,527 | 242,601
Government-sponsored enterprises debt securities | Fair Value Measurements, Recurring | Level 2 |  |
Assets |  |
Investment securities | 238,527 | 242,601
Government agency mortgage-backed securities |  |
Assets |  |
Investment securities | 438,850 | 351,390
Government agency mortgage-backed securities | Fair Value Measurements, Recurring |  |
Assets |  |
Investment securities | 438,850 | 351,390
Government agency mortgage-backed securities | Fair Value Measurements, Recurring | Level 2 |  |
Assets |  |
Investment securities | 438,850 | 351,390
Government-sponsored enterprises mortgage-backed securities |  |
Assets |  |
Investment securities | 161,241 | 174,741
Government-sponsored enterprises mortgage-backed securities | Fair Value Measurements, Recurring |  |
Assets |  |
Investment securities | 161,241 | 174,741
Government-sponsored enterprises mortgage-backed securities | Fair Value Measurements, Recurring | Level 2 |  |
Assets |  |
Investment securities | 161,241 | 174,741
Collateralized mortgage obligations: Government agency |  |
Assets |  |
Investment securities | 2,924,806 | 3,290,474
Collateralized mortgage obligations: Government agency | Fair Value Measurements, Recurring |  |
Assets |  |
Investment securities | 2,924,806 | 3,290,474
Collateralized mortgage obligations: Government agency | Fair Value Measurements, Recurring | Level 2 |  |
Assets |  |
Investment securities | 2,924,806 | 3,290,474
Collateralized mortgage obligations: Government-sponsored enterprises |  |
Assets |  |
Investment securities | 673,254 | 762,718
Collateralized mortgage obligations: Government-sponsored enterprises | Fair Value Measurements, Recurring |  |
Assets |  |
Investment securities | 673,254 | 762,718
Collateralized mortgage obligations: Government-sponsored enterprises | Fair Value Measurements, Recurring | Level 2 |  |
Assets |  |
Investment securities | 673,254 | 762,718
States and political subdivisions |  |
Assets |  |
Investment securities | 19,816 | 20,479
States and political subdivisions | Fair Value Measurements, Recurring |  |
Assets |  |
Investment securities | 19,816 | 20,479
States and political subdivisions | Fair Value Measurements, Recurring | Level 2 |  |
Assets |  |
Investment securities | $ 19,816 | $ 20,479

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