Securities - Summary of Contractual Maturities of Investment Securities Classified as Available for Sale and Held to Maturity (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Available for Sale, Amortized Cost
Due in one year or less	$ 90,745
Due after one year through five years	217,816
Due after five years through ten years	107,767
Due after ten years	55,279
Total	471,607
Amortized Cost	1,035,238	$ 1,158,534
Available for Sale, Fair Value
Due in one year or less	88,651
Due after one year through five years	204,111
Due after five years through ten years	93,372
Due after ten years	49,796
Total	435,930
Fair Value	946,282	1,054,312
Held to Maturity, Amortized Cost
Due in one year or less	24,853
Due after one year through five years	33,733
Due after five years through ten years	108,972
Due after ten years	320,068
Total	487,626
Amortized Cost	836,523	923,415
Held to Maturity, Fair Value
Due in one year or less	24,696
Due after one year through five years	32,023
Due after five years through ten years	95,124
Due after ten years	257,353
Total	409,196
Fair Value	702,563	$ 760,455
Mortgage-backed securities
Available for Sale, Amortized Cost
Mortgage-backed and asset-backed securities	563,631
Available for Sale, Fair Value
Mortgage-backed and asset-backed securities	510,352
Held to Maturity, Amortized Cost
Mortgage-backed and asset-backed securities	348,897
Held to Maturity, Fair Value
Mortgage-backed and asset-backed securities	$ 293,367