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Investment Securities - Amortized Cost and Fair Value Held-to-Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Held-to-Maturity
Allowance for securities held-to-maturity	$ (150)	$ (150)
Total held-to-maturity securities	2,969,343	3,013,493
Unrealized Gains	1,680	1,800
Unrealized Losses	(366,968)	(414,105)
Fair Value	2,604,055	2,601,188
U.S. government-sponsored entities and agencies
Held-to-Maturity
Amortized Cost	831,160	825,953
Unrealized Gains	0	0
Unrealized Losses	(130,687)	(154,827)
Fair Value	700,473	671,126
Mortgage-backed securities
Held-to-Maturity
Amortized Cost	984,770	1,029,131
Unrealized Gains	0	0
Unrealized Losses	(130,454)	(147,137)
Fair Value	854,316	881,994
States and political subdivisions
Held-to-Maturity
Amortized Cost	1,153,563	1,158,559
Unrealized Gains	1,680	1,800
Unrealized Losses	(105,827)	(112,141)
Fair Value	$ 1,049,416	$ 1,048,218

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