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Investment Securities - Schedule of Investment in AFS Securities and HTM Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2025	Dec. 31, 2024
Amortized Cost
Total investment securities available-for-sale	$ 1,271,179
Estimated Fair Value
Allowance for Credit Losses	0	$ (22)
Total investment securities available-for-sale	1,170,489
Amortized Cost
Less: allowance for credit losses	(1,229)	(1,306)
Total investment securities held-to-maturity	896,855	938,647
Estimated Fair Value
Estimated Fair Value	799,136	820,382
Asset-Backed Securities
Amortized Cost
Within one year	132,348
One to five years	309,296
Five to ten years	64,840
Beyond ten years	19,034
Estimated Fair Value
Within one year	131,057
One to five years	292,354
Five to ten years	58,623
Beyond ten years	16,436
Amortized Cost
Within one year	6,950
One to five years	70,009
Five to ten years	106,476
Beyond ten years	51,956
Less: allowance for credit losses	(1,229)
Total investment securities held-to-maturity	896,855
Total	2,168,034
Estimated Fair Value
Within one year	6,950
One to five years	68,381
Five to ten years	96,479
Beyond ten years	45,732
Estimated Fair Value	799,136
Total	1,969,625
Residential mortgage-backed securities
Amortized Cost
Amortized cost, without maturity date	670,486
Estimated Fair Value
Estimated fair value, without maturity date	600,156
Allowance for Credit Losses	0	0
Amortized Cost
Amortized cost, without maturity date	575,668
Estimated Fair Value
Estimated fair value, without maturity date	504,951
Estimated Fair Value	504,951	519,963
Commercial mortgage-backed securities
Amortized Cost
Amortized cost, without maturity date	75,175
Estimated Fair Value
Estimated fair value, without maturity date	71,863
Allowance for Credit Losses	0	0
Amortized Cost
Amortized cost, without maturity date	87,025
Estimated Fair Value
Estimated fair value, without maturity date	76,643
Estimated Fair Value	$ 76,643	$ 75,506

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