Securities Available for Sale and Held to Maturity - Contractual Maturities of Available for Sale and Held to Maturity Securities (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Securities Available for Sale, Amortized Cost [Abstract]
Due in one year or less	$ 24,449
Due after one year through five years	27,271
Due after five years through ten years	3,056
Due after ten years	26,962
Total amortized cost, before mortgage-backed securities	81,738
Mortgage-backed securities	1,772,791
Securities Available for Sale, Amortized Cost	1,854,529	$ 2,262,130
Securities Available for Sale, Estimated Fair Value [Abstract]
Due in one year or less	24,475
Due after one year through five years	27,481
Due after five years through ten years	2,989
Due after ten years	26,066
Total fair value, before mortgage-backed securities	81,011
Mortgage-backed securities	1,730,802
Total	1,811,813	2,238,635
Securities Held to Maturity, Amortized Cost [Abstract]
Due in one year or less	170
Due after one year through five years	35,073
Due after five years through ten years	4,276
Due after ten years	0
Total amortized cost, before mortgage-backed securities	39,519
Mortgage-backed securities	870,124
Securities Held to Maturity, Amortized Cost	909,643	1,056,486
Securities Held to Maturity, Estimated Fair Value [Abstract]
Due in one year or less	170
Due after one year through five years	35,193
Due after five years through ten years	4,350
Due after ten years	0
Total fair value, before mortgage-backed securities	39,713
Mortgage-backed securities	850,020
Total	$ 889,733	$ 1,046,247

Amortized cost held to maturity before mortgage backed securities.

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