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Investment Securities - Schedule of Investment in AFS Securities and HTM Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Amortized Cost
Total investment securities available-for-sale	$ 1,161,644
Estimated Fair Value
Less: allowance for credit losses	0	$ (22)
Total investment securities available-for-sale	1,073,412
Amortized Cost
Less: allowance for credit losses	(1,199)	(1,306)
Total investment securities held-to-maturity	872,418	938,647
Estimated Fair Value
Total investment securities held-to-maturity	786,662	820,382
Asset-Backed Securities
Amortized Cost
Within one year	122,508
One to five years	237,049
Five to ten years	64,715
Beyond ten years	18,807
Estimated Fair Value
Within one year	121,617
One to five years	224,915
Five to ten years	59,124
Beyond ten years	16,438
Amortized Cost
Within one year	0
One to five years	77,630
Five to ten years	99,613
Beyond ten years	51,173
Less: allowance for credit losses	(1,199)
Total investment securities held-to-maturity	872,418
Total	2,034,062
Estimated Fair Value
Within one year	0
One to five years	75,376
Five to ten years	92,629
Beyond ten years	46,312
Total investment securities held-to-maturity	786,662
Total	1,860,074
Residential mortgage-backed securities
Amortized Cost
Amortized cost, without maturity	644,193
Estimated Fair Value
Estimated fair value, without maturity	579,600
Less: allowance for credit losses	0	0
Amortized Cost
Amortized cost, without maturity	558,842
Estimated Fair Value
Estimated fair value, without maturity	496,400
Total investment securities held-to-maturity	496,400	519,963
Commercial mortgage-backed securities
Amortized Cost
Amortized cost, without maturity	74,372
Estimated Fair Value
Estimated fair value, without maturity	71,718
Less: allowance for credit losses	0	0
Amortized Cost
Amortized cost, without maturity	86,359
Estimated Fair Value
Estimated fair value, without maturity	75,945
Total investment securities held-to-maturity	$ 75,945	$ 75,506

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