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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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