Quarterly report pursuant to Section 13 or 15(d)

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

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Securities - Summary of Investment Securities Available for Sale (Detail) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 985,305 $ 967,031
Gross Unrealized Gain 323 891
Gross Unrealized Loss (107,990) (102,183)
Estimated Fair Value 877,638 865,739
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 101,003 86,355
Gross Unrealized Gain 24 173
Gross Unrealized Loss (1,031) (1,040)
Estimated Fair Value 99,996 85,488
Mortgage-backed securities - residential    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 480,881 504,544
Gross Unrealized Gain 162 481
Gross Unrealized Loss (66,175) (62,697)
Estimated Fair Value 414,868 442,328
Mortgage-backed securities - commercial    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 65,402 59,973
Gross Unrealized Gain 21  
Gross Unrealized Loss (12,551) (11,982)
Estimated Fair Value 52,872 47,991
Collateralized mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 134,155 106,823
Gross Unrealized Gain 116 237
Gross Unrealized Loss (10,059) (9,649)
Estimated Fair Value 124,212 97,411
Debt securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 127,258 132,215
Gross Unrealized Loss (6,656) (7,590)
Estimated Fair Value 120,602 124,625
Total U.S. government agency and sponsored agency obligations    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 807,696 803,555
Gross Unrealized Gain 299 718
Gross Unrealized Loss (95,441) (91,918)
Estimated Fair Value 712,554 712,355
Municipal bonds-tax exempt    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 76,606 77,121
Gross Unrealized Loss (11,518) (9,225)
Estimated Fair Value $ 65,088 $ 67,896