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Fair Value - Assets and Liabilities Recorded at Fair Value on a Recurring Basis (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Assets |  |
Investment securities | $ 4,395,476 | $ 4,498,342
Fair Value Measurements, Recurring |  |
Assets |  |
Investment securities | 4,395,476 | 4,498,342
Other assets | 60,282 | 12,336
Liabilities |  |
Other liabilities | (1,957) | (14,692)
Total |  |
Net Assets (Liabilities) | 4,453,801 | 4,495,986
Fair Value Measurements, Recurring | Level 2 |  |
Assets |  |
Investment securities | 4,395,476 | 4,498,342
Other assets | 60,282 | 12,336
Liabilities |  |
Other liabilities | (778) | (12,085)
Total |  |
Net Assets (Liabilities) | 4,454,980 | 4,498,593
Fair Value Measurements, Recurring | Level 3 |  |
Liabilities |  |
Other liabilities | (1,179) | (2,607)
Total |  |
Net Assets (Liabilities) | (1,179) | (2,607)
U.S. Treasury securities |  |
Assets |  |
Investment securities | 29,556 | 389,470
U.S. Treasury securities | Fair Value Measurements, Recurring |  |
Assets |  |
Investment securities | 29,556 | 389,470
U.S. Treasury securities | Fair Value Measurements, Recurring | Level 2 |  |
Assets |  |
Investment securities | 29,556 | 389,470
Government agency debt securities |  |
Assets |  |
Investment securities | 24,713 |
Government agency debt securities | Fair Value Measurements, Recurring |  |
Assets |  |
Investment securities | 24,713 |
Government agency debt securities | Fair Value Measurements, Recurring | Level 2 |  |
Assets |  |
Investment securities | 24,713 |
Government-sponsored enterprises debt securities |  |
Assets |  |
Investment securities | 164,316 | 241,594
Government-sponsored enterprises debt securities | Fair Value Measurements, Recurring |  |
Assets |  |
Investment securities | 164,316 | 241,594
Government-sponsored enterprises debt securities | Fair Value Measurements, Recurring | Level 2 |  |
Assets |  |
Investment securities | 164,316 | 241,594
Government agency mortgage-backed securities |  |
Assets |  |
Investment securities | 362,221 | 411,536
Government agency mortgage-backed securities | Fair Value Measurements, Recurring |  |
Assets |  |
Investment securities | 362,221 | 411,536
Government agency mortgage-backed securities | Fair Value Measurements, Recurring | Level 2 |  |
Assets |  |
Investment securities | 362,221 | 411,536
Government-sponsored enterprises mortgage-backed securities |  |
Assets |  |
Investment securities | 151,683 | 150,847
Government-sponsored enterprises mortgage-backed securities | Fair Value Measurements, Recurring |  |
Assets |  |
Investment securities | 151,683 | 150,847
Government-sponsored enterprises mortgage-backed securities | Fair Value Measurements, Recurring | Level 2 |  |
Assets |  |
Investment securities | 151,683 | 150,847
Collateralized mortgage obligations: Government agency |  |
Assets |  |
Investment securities | 2,613,465 | 2,682,449
Collateralized mortgage obligations: Government agency | Fair Value Measurements, Recurring |  |
Assets |  |
Investment securities | 2,613,465 | 2,682,449
Collateralized mortgage obligations: Government agency | Fair Value Measurements, Recurring | Level 2 |  |
Assets |  |
Investment securities | 2,613,465 | 2,682,449
Collateralized mortgage obligations: Government-sponsored enterprises |  |
Assets |  |
Investment securities | 1,049,522 | 602,592
Collateralized mortgage obligations: Government-sponsored enterprises | Fair Value Measurements, Recurring |  |
Assets |  |
Investment securities | 1,049,522 | 602,592
Collateralized mortgage obligations: Government-sponsored enterprises | Fair Value Measurements, Recurring | Level 2 |  |
Assets |  |
Investment securities | $ 1,049,522 | 602,592
States and political subdivisions |  |
Assets |  |
Investment securities |  | 19,854
States and political subdivisions | Fair Value Measurements, Recurring |  |
Assets |  |
Investment securities |  | 19,854
States and political subdivisions | Fair Value Measurements, Recurring | Level 2 |  |
Assets |  |
Investment securities |  | $ 19,854

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