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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, 2025	Dec. 31, 2024
Amortized Cost
Due in one year or less	$ 14,985
Due from one year to five years	134,559
Due from five years to ten years	234,449
Due after ten years	831,226
Amortized cost, before securities without debt maturities	1,215,219
Amortized Cost	3,847,076
Estimated Fair Value
Due in one year or less	14,973
Due from one year to five years	133,654
Due from five years to ten years	228,280
Due after ten years	689,868
Available for sale securities, debt maturities, before securities without single maturities	1,066,775
Estimated Fair Value	3,594,076	$ 3,410,899
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	1,451,194	1,395,569
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	1,285,350	1,183,449
Mortgage-Backed Securities [Member]
Amortized Cost
Available-for-sale securities, amortized cost without single maturity date	877,560
Amortized Cost	877,560	1,029,846
Estimated Fair Value
Available-for-sale securities, debt maturities, without single maturity date, fair value	858,992
Estimated Fair Value	858,992	989,875
Amortized Cost
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost	597,922
Amortized Cost, Held to Maturity	597,922	537,856
Estimated Fair Value
Debt securities, held-to-maturity, maturity, without single maturity date, fair value	555,831
Estimated Fair Value, Held to Maturity	555,831	477,696
Commercial Mortgage Backed Securities [Member]
Amortized Cost
Available-for-sale securities, amortized cost without single maturity date	624,969
Amortized Cost	624,969	617,605
Estimated Fair Value
Available-for-sale securities, debt maturities, without single maturity date, fair value	532,867
Estimated Fair Value	532,867	516,882
Amortized Cost
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost	853,272
Amortized Cost, Held to Maturity	853,272	857,713
Estimated Fair Value
Debt securities, held-to-maturity, maturity, without single maturity date, fair value	729,519
Estimated Fair Value, Held to Maturity	729,519	705,753
Collateralized Mortgage Obligations [Member]
Amortized Cost
Available-for-sale securities, amortized cost without single maturity date	1,129,328
Amortized Cost	1,129,328	798,157
Estimated Fair Value
Available-for-sale securities, debt maturities, without single maturity date, fair value	1,135,442
Estimated Fair Value	1,135,442	$ 788,885
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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