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Investment Securities Schedule of Amortized Cost and Fair Values of Debt Securities by Contractual Maturities (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Amortized Cost
Due in one year or less	$ 8,233
Due from one year to five years	246,887
Due from five years to ten years	378,245
Due after ten years	1,124,366
Amortized cost, before securities without debt maturities	1,757,731
Amortized Cost	3,024,001
Estimated Fair Value
Due in one year or less	8,422
Due from one year to five years	247,567
Due from five years to ten years	394,995
Due after ten years	1,159,157
Available for sale securities, debt maturities, before securities without single maturities	1,810,141
Estimated Fair Value	3,084,337	$ 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	916,423	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	910,156
Mortgage-Backed Securities [Member]
Amortized Cost
Available-for-sale securities, amortized cost without single maturity date	191,623
Amortized Cost	191,623	373,779
Estimated Fair Value
Available-for-sale securities, debt maturities, without single maturity date, fair value	190,123
Estimated Fair Value	190,123	377,998
Amortized Cost
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost	410,189
Amortized Cost, Held to Maturity	410,189	278,281
Estimated Fair Value
Debt securities, held-to-maturity, maturity, without single maturity date, fair value	417,478
Estimated Fair Value, Held to Maturity	417,478	296,857
Commercial Mortgage Backed Securities [Member]
Amortized Cost
Available-for-sale securities, amortized cost without single maturity date	827,921
Amortized Cost	827,921	741,172
Estimated Fair Value
Available-for-sale securities, debt maturities, without single maturity date, fair value	832,038
Estimated Fair Value	832,038	762,415
Amortized Cost
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost	506,234
Amortized Cost, Held to Maturity	506,234
Estimated Fair Value
Debt securities, held-to-maturity, maturity, without single maturity date, fair value	492,678
Estimated Fair Value, Held to Maturity	492,678
Collateralized Mortgage Obligations [Member]
Amortized Cost
Available-for-sale securities, amortized cost without single maturity date	246,726
Amortized Cost	246,726	491,321
Estimated Fair Value
Available-for-sale securities, debt maturities, without single maturity date, fair value	252,035
Estimated Fair Value	252,035	$ 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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