Securities - Schedule of Amortized Cost and Fair Value of Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2026	Dec. 31, 2025
Amortized Cost
Due in less than one year	$ 0
Due after one year through five years	0
Due after five years through ten years	0
Due after ten years	0
Held to maturity loans with maturity date, amortized cost, total	0
Held to maturity, amortized cost, total	552,982	$ 586,178
Fair Value
Due in less than one year	0
Due after one year through five years	0
Due after five years through ten years	0
Due after ten years	0
Held to maturity loans with maturity date, fair value, total	0
Held to maturity, fair value, total	435,311	489,560
Amortized Cost
Due in less than one year	6,265
Due after one year through five years	2,993
Due after five years through ten years	50,352
Due after ten years	334,925
Available for sale loans with maturity date, amortized cost, total	394,535
Available for sale, amortized cost, total	4,983,039	5,266,294
Fair Value
Due in less than one year	6,260
Due after one year through five years	2,921
Due after five years through ten years	46,655
Due after ten years	312,358
Available for sale loans with maturity date, fair value, total	368,194
Available for sale, fair value, total	4,634,355	5,164,567
Residential mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities
Amortized Cost
Loans without single maturity date	466,721
Held to maturity, amortized cost, total	466,721	498,931
Fair Value
Loans without single maturity date	356,916
Held to maturity, fair value, total	356,916	408,235
Amortized Cost
Loans without single maturity date	3,728,834
Available for sale, amortized cost, total	3,728,834	3,681,499
Fair Value
Loans without single maturity date	3,431,201
Available for sale, fair value, total	3,431,201	3,587,499
Commercial mortgage-backed securities and collateralized mortgage obligations of U.S. government-sponsored entities
Amortized Cost
Loans without single maturity date	86,261
Held to maturity, amortized cost, total	86,261	87,247
Fair Value
Loans without single maturity date	78,395
Held to maturity, fair value, total	78,395	81,325
Amortized Cost
Loans without single maturity date	284,625
Available for sale, amortized cost, total	284,625	395,165
Fair Value
Loans without single maturity date	273,655
Available for sale, fair value, total	273,655	393,873
Private mortgage-backed securities and collateralized mortgage obligations
Amortized Cost
Loans without single maturity date	0
Fair Value
Loans without single maturity date	0
Amortized Cost
Loans without single maturity date	81,000
Available for sale, amortized cost, total	81,000	131,846
Fair Value
Loans without single maturity date	74,518
Available for sale, fair value, total	74,518	127,397
CLOs
Amortized Cost
Loans without single maturity date	0
Fair Value
Loans without single maturity date	0
Amortized Cost
Loans without single maturity date	317,266
Available for sale, amortized cost, total	317,266	423,864
Fair Value
Loans without single maturity date	316,916
Available for sale, fair value, total	316,916	423,988
Other debt securities
Amortized Cost
Loans without single maturity date	0
Fair Value
Loans without single maturity date	0
Amortized Cost
Loans without single maturity date	176,779
Available for sale, amortized cost, total	176,779	242,672
Fair Value
Loans without single maturity date	169,871
Available for sale, fair value, total	$ 169,871	$ 242,517