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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, 2020	Dec. 31, 2019
Amortized Cost
Due in one year or less	$ 11,252
Due from one year to five years	32,118
Due from five years to ten years	315,094
Due after ten years	950,684
Amortized cost, before securities without debt maturities	1,309,148
Amortized Cost	2,691,879
Estimated Fair Value
Due in one year or less	11,388
Due from one year to five years	33,397
Due from five years to ten years	330,233
Due after ten years	992,084
Available for sale securities, debt maturities, before securities without single maturities	1,367,102
Estimated Fair Value	2,793,480	$ 2,497,537
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	304,241	369,841
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	324,940
Collateralized Mortgage Obligations [Member]
Amortized Cost
Available-for-sale securities, amortized cost without single maturity date	516,312
Amortized Cost	516,312
Estimated Fair Value
Available-for-sale securities, debt maturities, without single maturity date, fair value	532,473
Estimated Fair Value	532,473
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
Commercial Mortgage Backed Securities [Member]
Amortized Cost
Available-for-sale securities, amortized cost without single maturity date	548,076
Amortized Cost	548,076
Estimated Fair Value
Available-for-sale securities, debt maturities, without single maturity date, fair value	572,210
Estimated Fair Value	572,210
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
Mortgage-Backed Securities [Member]
Amortized Cost
Available-for-sale securities, amortized cost without single maturity date	318,343
Amortized Cost	318,343
Estimated Fair Value
Available-for-sale securities, debt maturities, without single maturity date, fair value	321,695
Estimated Fair Value	321,695
Amortized Cost
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost	304,241
Amortized Cost, Held to Maturity	304,241	369,841
Estimated Fair Value
Debt securities, held-to-maturity, maturity, without single maturity date, fair value	324,940
Estimated Fair Value, Held to Maturity	$ 324,940	$ 383,705

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