Investment Securities - Schedule of Investment in AFS Securities and HTM Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Amortized Cost
Total investment securities available-for-sale	$ 991,993
Estimated Fair Value
Less: allowance for credit losses	0	$ 0
Total investment securities available-for-sale	892,030
Held to maturity, allowance for credit loss	409	1,030
Amortized Cost
Less: allowance for credit losses	(409)	(1,030)
Total investment securities held-to-maturity	797,449	854,780
Estimated Fair Value
Total investment securities held-to-maturity	684,454	774,947
Asset-Backed Securities
Amortized Cost
Within one year	53,179
One to five years	295,611
Five to ten years	17,143
Beyond ten years	17,686
Estimated Fair Value
Within one year	52,464
One to five years	278,894
Five to ten years	15,793
Beyond ten years	14,870
Held to maturity, allowance for credit loss	409
Amortized Cost
Within one year	26,080
One to five years	59,778
Five to ten years	76,456
Beyond ten years	50,066
Less: allowance for credit losses	(409)
Total investment securities held-to-maturity	797,449
Total	1,789,442
Estimated Fair Value
Within one year	25,856
One to five years	56,555
Five to ten years	69,691
Beyond ten years	42,183
Total investment securities held-to-maturity	684,454
Total	1,576,484
Residential mortgage-backed securities
Amortized Cost
Amortized cost, without maturity	549,831
Estimated Fair Value
Estimated fair value, without maturity	476,400
Amortized Cost
Amortized cost, without maturity	501,554
Estimated Fair Value
Estimated fair value, without maturity	419,595
Total investment securities held-to-maturity	419,595	485,566
Commercial mortgage-backed securities
Amortized Cost
Amortized cost, without maturity	58,543
Estimated Fair Value
Estimated fair value, without maturity	53,609
Amortized Cost
Amortized cost, without maturity	83,924
Estimated Fair Value
Estimated fair value, without maturity	70,574
Total investment securities held-to-maturity	$ 70,574	$ 75,973