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Investment Securities Schedule of Amortized Cost and Fair Values of Debt Securities by Contractual Maturities (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Amortized Cost
Due in one year or less	$ 14,488
Due from one year to five years	109,259
Due from five years to ten years	274,191
Due after ten years	833,058
Amortized cost, before securities without debt maturities	1,230,996
Amortized Cost	3,922,780
Estimated Fair Value
Due in one year or less	14,470
Due from one year to five years	107,339
Due from five years to ten years	260,443
Due after ten years	656,595
Available for sale securities, debt maturities, before securities without single maturities	1,038,847
Estimated Fair Value	3,619,869	$ 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	1,473,158	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	1,293,001	1,183,449
Mortgage-Backed Securities [Member]
Amortized Cost
Available-for-sale securities, amortized cost without single maturity date	922,074
Amortized Cost	922,074	1,029,846
Estimated Fair Value
Available-for-sale securities, debt maturities, without single maturity date, fair value	896,735
Estimated Fair Value	896,735	989,875
Amortized Cost
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost	618,955
Amortized Cost, Held to Maturity	618,955	537,856
Estimated Fair Value
Debt securities, held-to-maturity, maturity, without single maturity date, fair value	569,697
Estimated Fair Value, Held to Maturity	569,697	477,696
Commercial Mortgage Backed Securities [Member]
Amortized Cost
Available-for-sale securities, amortized cost without single maturity date	604,696
Amortized Cost	604,696	617,605
Estimated Fair Value
Available-for-sale securities, debt maturities, without single maturity date, fair value	512,049
Estimated Fair Value	512,049	516,882
Amortized Cost
Debt securities, held-to-maturity, maturity, without single maturity date, amortized cost	854,203
Amortized Cost, Held to Maturity	854,203	857,713
Estimated Fair Value
Debt securities, held-to-maturity, maturity, without single maturity date, fair value	723,304
Estimated Fair Value, Held to Maturity	723,304	705,753
Collateralized Mortgage Obligations [Member]
Amortized Cost
Available-for-sale securities, amortized cost without single maturity date	1,165,014
Amortized Cost	1,165,014	798,157
Estimated Fair Value
Available-for-sale securities, debt maturities, without single maturity date, fair value	1,172,238
Estimated Fair Value	1,172,238	$ 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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