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Investment Securities Schedule of Amortized Cost and Fair Values of Debt Securities by Contractual Maturities (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Amortized Cost
Due in one year or less	$ 237,505
Due from one year to five years	75,121
Due from five years to ten years	544,101
Due after ten years	1,057,057
Amortized cost, before securities without debt maturities	1,913,784
Amortized Cost	2,945,913
Estimated Fair Value
Due in one year or less	231,571
Due from one year to five years	72,835
Due from five years to ten years	509,791
Due after ten years	913,505
Available for sale securities, debt maturities, before securities without single maturities	1,727,702
Estimated Fair Value	2,642,389	$ 2,646,767
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	1,307,712	1,321,256
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	1,125,027	1,125,049
Mortgage-Backed Securities [Member]
Amortized Cost
Available-for-sale securities, amortized cost without single maturity date	238,775
Amortized Cost	238,775	242,527
Estimated Fair Value
Available-for-sale securities, debt maturities, without single maturity date, fair value	212,574
Estimated Fair Value	212,574	212,698
Amortized Cost
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost	444,431
Amortized Cost, Held to Maturity	444,431	457,325
Estimated Fair Value
Debt securities, held-to-maturity, maturity, without single maturity date, fair value	392,353
Estimated Fair Value, Held to Maturity	392,353	399,845
Commercial Mortgage Backed Securities [Member]
Amortized Cost
Available-for-sale securities, amortized cost without single maturity date	651,767
Amortized Cost	651,767	631,604
Estimated Fair Value
Available-for-sale securities, debt maturities, without single maturity date, fair value	571,663
Estimated Fair Value	571,663	552,522
Amortized Cost
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost	863,281
Amortized Cost, Held to Maturity	863,281	863,931
Estimated Fair Value
Debt securities, held-to-maturity, maturity, without single maturity date, fair value	732,674
Estimated Fair Value, Held to Maturity	732,674	725,204
Collateralized Mortgage Obligations [Member]
Amortized Cost
Available-for-sale securities, amortized cost without single maturity date	141,587
Amortized Cost	141,587	147,155
Estimated Fair Value
Available-for-sale securities, debt maturities, without single maturity date, fair value	130,450
Estimated Fair Value	130,450	$ 134,033
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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