Investment Securities - Schedule of Amortized Cost and Fair Value of Debt Securities by Contractual Maturity (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Amortized cost
Due in one year or less	$ 3,188	$ 64,776
Due in one to five years	10,586	75,996
Due in five to ten years	157,552	51,162
Due in over ten years	454,738	391,270
Amortized cost, sub-total	626,064	583,204
Amortized cost, AFS debt securities	1,664,587	1,658,779
Fair Value
Due in one year or less	3,174	64,279
Due in one to five years	9,832	71,801
Due in five to ten years	156,768	49,630
Due in over ten years	432,230	372,331
Fair value, sub-total	602,004	558,041
Total AFS debt securities	1,482,379	1,471,973
Mortgage-backed securities - residential
Amortized cost
Mortgage-backed securities	1,021,125	1,057,389
Amortized cost, AFS debt securities	1,021,125	1,057,389
Fair Value
Mortgage-backed securities	864,272	896,971
Total AFS debt securities	864,272	896,971
Mortgage-backed securities - commercial
Amortized cost
Mortgage-backed securities	17,398	18,186
Amortized cost, AFS debt securities	17,398	18,186
Fair Value
Mortgage-backed securities	16,103	16,961
Total AFS debt securities	$ 16,103	$ 16,961