Quarterly report pursuant to Section 13 or 15(d)

Securities - Summary of Investment Securities Available for Sale (Detail)

v3.24.3
Securities - Summary of Investment Securities Available for Sale (Detail) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 987,498 $ 967,031
Gross Unrealized Gain 2,590 891
Gross Unrealized Loss (81,167) (102,183)
Estimated Fair Value 908,921 865,739
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 94,117 86,355
Gross Unrealized Gain 565 173
Gross Unrealized Loss (476) (1,040)
Estimated Fair Value 94,206 85,488
Mortgage-backed securities - residential    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 464,410 504,544
Gross Unrealized Gain 791 481
Gross Unrealized Loss (48,928) (62,697)
Estimated Fair Value 416,273 442,328
Mortgage-backed securities - commercial    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 73,939 59,973
Gross Unrealized Gain 167  
Gross Unrealized Loss (11,004) (11,982)
Estimated Fair Value 63,102 47,991
Collateralized mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 150,334 106,823
Gross Unrealized Gain 1,034 237
Gross Unrealized Loss (7,512) (9,649)
Estimated Fair Value 143,856 97,411
Debt securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 128,352 132,215
Gross Unrealized Gain 33  
Gross Unrealized Loss (4,135) (7,590)
Estimated Fair Value 124,250 124,625
Total U.S. government agency and sponsored agency obligations    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 817,035 803,555
Gross Unrealized Gain 2,025 718
Gross Unrealized Loss (71,579) (91,918)
Estimated Fair Value 747,481 712,355
Municipal bonds-tax exempt    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 76,346 77,121
Gross Unrealized Loss (9,112) (9,225)
Estimated Fair Value $ 67,234 $ 67,896