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Investment Securities Schedule of Amortized Cost and Fair Values of Debt Securities by Contractual Maturities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Available for Sale
Due in one year or less	$ 148,382
Due from one year to five years	159,126
Due from five years to ten years	535,229
Due after ten years	1,128,490
Amortized cost, before securities without debt maturities	1,971,227
Amortized Cost	2,992,513	$ 3,129,530
Estimated Fair Value
Due in one year or less	143,463
Due from one year to five years	154,536
Due from five years to ten years	497,049
Due after ten years	952,466
Available for sale securities, debt maturities, before securities without single maturities	1,747,514
Estimated Fair Value	2,646,767	3,187,390
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
Amortized Cost	1,321,256	980,384
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
Total	1,125,049
Residential mortgage-backed securities
Available for Sale
Available-for-sale securities, amortized cost without single maturity date	242,527
Amortized Cost	242,527	231,607
Estimated Fair Value
Available-for-sale securities, debt maturities, without single maturity date, fair value	212,698
Estimated Fair Value	212,698	229,795
Amortized Cost
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost	457,325
Amortized Cost	457,325	404,958
Estimated Fair Value
Debt securities, held-to-maturity, maturity, without single maturity date, fair value	399,845
Total	399,845	408,913
Commercial mortgage-backed securities
Available for Sale
Available-for-sale securities, amortized cost without single maturity date	631,604
Amortized Cost	631,604	974,541
Estimated Fair Value
Available-for-sale securities, debt maturities, without single maturity date, fair value	552,522
Estimated Fair Value	552,522	971,148
Amortized Cost
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost	863,931
Amortized Cost	863,931	575,426
Estimated Fair Value
Debt securities, held-to-maturity, maturity, without single maturity date, fair value	725,204
Total	725,204	556,954
Collateralized mortgage obligations
Available for Sale
Available-for-sale securities, amortized cost without single maturity date	147,155
Amortized Cost	147,155	206,532
Estimated Fair Value
Available-for-sale securities, debt maturities, without single maturity date, fair value	134,033
Estimated Fair Value	134,033	$ 209,359
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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