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Securities - Summary of Amortized Cost of Available-for-Sale Securities by Contractual Maturity (Details) $ in Thousands	Jun. 30, 2020 USD ($)
Available-for-Sale Debt Securities:
Due within one year	$ 179,930
Due from one to five years	724,999
Due from five to ten years	1,247,921
Due after ten years	3,015,332
Total debt securities available for sale	5,168,182
Mortgage-related Securities
Available-for-Sale Debt Securities:
Due within one year	109,229
Due from one to five years	462,094
Due from five to ten years	148,386
Due after ten years	2,181,920
Total debt securities available for sale	$ 2,901,629
Available-for-Sale Securities, Average Yield
Due within one year, Average Yield	3.54%
Due from one to five years, Average Yield	3.11%
Due from five to ten years, Average Yield	2.71%
Due after ten years, Average Yield	2.55%
Total securities available for sale, Average Yield	2.69%
U.S. Government and GSE obligations
Available-for-Sale Debt Securities:
Due within one year	$ 68,888
Due from one to five years	25,924
Due from five to ten years	316,056
Due after ten years	323,171
Total debt securities available for sale	$ 734,039
Available-for-Sale Securities, Average Yield
Due within one year, Average Yield	0.99%
Due from one to five years, Average Yield	3.39%
Due from five to ten years, Average Yield	3.21%
Due after ten years, Average Yield	2.15%
Total securities available for sale, Average Yield	2.54%
State, County, and Municipal
Available-for-Sale Debt Securities:
Due within one year	$ 149
Due from five to ten years	20,334
Due after ten years	5,883
Total debt securities available for sale	$ 26,366
Available-for-Sale Securities, Average Yield
Due within one year, Average Yield	6.66%
Due from five to ten years, Average Yield	3.50%
Due after ten years, Average Yield	3.33%
Total securities available for sale, Average Yield	3.48%
Other Debt Securities
Available-for-Sale Debt Securities:
Due from one to five years	$ 196,373
Due from five to ten years	761,943
Due after ten years	447,710
Total debt securities available for sale	$ 1,406,026
Available-for-Sale Securities, Average Yield
Due from one to five years, Average Yield	3.15%
Due from five to ten years, Average Yield	2.39%
Due after ten years, Average Yield	1.41%
Total securities available for sale, Average Yield	2.18%

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