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Investment Securities Schedule of Amortized Cost and Fair Values of Debt Securities by Contractual Maturities (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Amortized Cost
Due in one year or less	$ 8,212
Due from one year to five years	253,200
Due from five years to ten years	353,124
Due after ten years	1,034,967
Amortized cost, before securities without debt maturities	1,649,503
Amortized Cost	3,009,064
Estimated Fair Value
Due in one year or less	8,240
Due from one year to five years	253,976
Due from five years to ten years	371,026
Due after ten years	1,084,411
Available for sale securities, debt maturities, before securities without single maturities	1,717,653
Estimated Fair Value	3,097,375	$ 3,062,143
Amortized Cost
Due in one year or less	0
Due from one year to five years	0
Due from five years to ten years	0
Due after ten years	0
Debt securities, held-to-maturity, maturity, allocated and single maturity date, amortized cost, total	0
Amortized Cost, Held to Maturity	824,283	278,281
Estimated Fair Value
Due in one year or less	0
Due from one year to five years	0
Due from five years to ten years	0
Due after ten years	0
Debt securities, held-to-maturity, maturity, Allocated and single maturity date, fair value	0
Estimated Fair Value, Held to Maturity	826,932
Mortgage-Backed Securities [Member]
Amortized Cost
Available-for-sale securities, amortized cost without single maturity date	201,654
Amortized Cost	201,654	373,779
Estimated Fair Value
Available-for-sale securities, debt maturities, without single maturity date, fair value	201,547
Estimated Fair Value	201,547	377,998
Amortized Cost
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost	439,220
Amortized Cost, Held to Maturity	439,220	278,281
Estimated Fair Value
Debt securities, held-to-maturity, maturity, without single maturity date, fair value	449,671
Estimated Fair Value, Held to Maturity	449,671	296,857
Commercial Mortgage Backed Securities [Member]
Amortized Cost
Available-for-sale securities, amortized cost without single maturity date	858,574
Amortized Cost	858,574	741,172
Estimated Fair Value
Available-for-sale securities, debt maturities, without single maturity date, fair value	871,010
Estimated Fair Value	871,010	762,415
Amortized Cost
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost	385,063
Amortized Cost, Held to Maturity	385,063
Estimated Fair Value
Debt securities, held-to-maturity, maturity, without single maturity date, fair value	377,261
Estimated Fair Value, Held to Maturity	377,261
Collateralized Mortgage Obligations [Member]
Amortized Cost
Available-for-sale securities, amortized cost without single maturity date	299,333
Amortized Cost	299,333	491,321
Estimated Fair Value
Available-for-sale securities, debt maturities, without single maturity date, fair value	307,165
Estimated Fair Value	307,165	$ 503,766
Amortized Cost
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost	0
Estimated Fair Value
Debt securities, held-to-maturity, maturity, without single maturity date, fair value	$ 0

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