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Fair Value - Assets and Liabilities Recorded at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Assets |  |
Investment securities | $ 5,314,973 | $ 5,077,514
Fair Value Measurements, Recurring |  |
Assets |  |
Investment securities | 5,314,973 | 5,077,514
Other assets | 19,831 | 15,982
Liabilities |  |
Other liabilities | (24,833) | (31,202)
Total |  |
Net Assets (Liabilities) | 5,309,971 | 5,062,294
Fair Value Measurements, Recurring | Level 2 |  |
Assets |  |
Investment securities | 5,314,973 | 5,077,514
Other assets | 19,831 | 15,982
Liabilities |  |
Other liabilities | (18,858) | (23,742)
Total |  |
Net Assets (Liabilities) | 5,315,946 | 5,069,754
Fair Value Measurements, Recurring | Level 3 |  |
Liabilities |  |
Other liabilities | (5,975) | (7,460)
Total |  |
Net Assets (Liabilities) | (5,975) | (7,460)
U.S. Treasury securities |  |
Assets |  |
Investment securities | 396,766 | 392,473
U.S. Treasury securities | Fair Value Measurements, Recurring |  |
Assets |  |
Investment securities | 396,766 | 392,473
U.S. Treasury securities | Fair Value Measurements, Recurring | Level 2 |  |
Assets |  |
Investment securities | 396,766 | 392,473
Government-sponsored enterprises debt securities |  |
Assets |  |
Investment securities | 245,138 | 242,667
Government-sponsored enterprises debt securities | Fair Value Measurements, Recurring |  |
Assets |  |
Investment securities | 245,138 | 242,667
Government-sponsored enterprises debt securities | Fair Value Measurements, Recurring | Level 2 |  |
Assets |  |
Investment securities | 245,138 | 242,667
Government agency mortgage-backed securities |  |
Assets |  |
Investment securities | 159,787 | 185,663
Government agency mortgage-backed securities | Fair Value Measurements, Recurring |  |
Assets |  |
Investment securities | 159,787 | 185,663
Government agency mortgage-backed securities | Fair Value Measurements, Recurring | Level 2 |  |
Assets |  |
Investment securities | 159,787 | 185,663
Government-sponsored enterprises mortgage-backed securities |  |
Assets |  |
Investment securities | 184,139 | 204,385
Government-sponsored enterprises mortgage-backed securities | Fair Value Measurements, Recurring |  |
Assets |  |
Investment securities | 184,139 | 204,385
Government-sponsored enterprises mortgage-backed securities | Fair Value Measurements, Recurring | Level 2 |  |
Assets |  |
Investment securities | 184,139 | 204,385
Non-government asset-backed securities |  |
Assets |  |
Investment securities | 101 | 12,583
Non-government asset-backed securities | Fair Value Measurements, Recurring |  |
Assets |  |
Investment securities | 101 | 12,583
Non-government asset-backed securities | Fair Value Measurements, Recurring | Level 2 |  |
Assets |  |
Investment securities | 101 | 12,583
Collateralized mortgage obligations: Government agency |  |
Assets |  |
Investment securities | 3,513,904 | 3,351,822
Collateralized mortgage obligations: Government agency | Fair Value Measurements, Recurring |  |
Assets |  |
Investment securities | 3,513,904 | 3,351,822
Collateralized mortgage obligations: Government agency | Fair Value Measurements, Recurring | Level 2 |  |
Assets |  |
Investment securities | 3,513,904 | 3,351,822
Collateralized mortgage obligations: Government-sponsored enterprises |  |
Assets |  |
Investment securities | 815,138 | 687,921
Collateralized mortgage obligations: Government-sponsored enterprises | Fair Value Measurements, Recurring |  |
Assets |  |
Investment securities | 815,138 | 687,921
Collateralized mortgage obligations: Government-sponsored enterprises | Fair Value Measurements, Recurring | Level 2 |  |
Assets |  |
Investment securities | $ 815,138 | $ 687,921

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