Investment Securities - Schedule of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Dec. 31, 2024
Amortized cost
Due in one year or less	$ 205	$ 849
Due in one to five years	14,433	4,186
Due in five to ten years	346,312	225,954
Due in over ten years	491,251	504,560
Amortized cost, sub-total	852,201	735,549
Amortized cost	1,482,841	1,679,397
Fair Value
Due in one year or less	203	847
Due in one to five years	14,445	4,600
Due in five to ten years	342,997	222,943
Due in over ten years	471,038	483,762
Fair value, sub-total	828,683	712,152
Total AFS debt securities	1,426,951	1,538,008
Mortgage-backed securities - residential
Amortized cost
Mortgage-backed securities	619,439	927,883
Amortized cost	619,439	927,883
Fair Value
Mortgage-backed securities	587,587	810,999
Total AFS debt securities	587,587	810,999
Mortgage-backed securities - commercial
Amortized cost
Mortgage-backed securities	11,201	15,965
Amortized cost	11,201	15,965
Fair Value
Mortgage-backed securities	10,681	14,857
Total AFS debt securities	$ 10,681	$ 14,857