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
Mar. 31, 2024
Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 978,580 $ 967,031
Gross Unrealized Gain 354 891
Gross Unrealized Loss (106,744) (102,183)
Estimated Fair Value 872,190 865,739
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 88,407 86,355
Gross Unrealized Gain 21 173
Gross Unrealized Loss (1,124) (1,040)
Estimated Fair Value 87,304 85,488
Mortgage-backed securities - residential    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 489,714 504,544
Gross Unrealized Gain 226 481
Gross Unrealized Loss (65,267) (62,697)
Estimated Fair Value 424,673 442,328
Mortgage-backed securities - commercial    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 59,603 59,973
Gross Unrealized Loss (12,383) (11,982)
Estimated Fair Value 47,220 47,991
Collateralized mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 131,756 106,823
Gross Unrealized Gain 107 237
Gross Unrealized Loss (10,128) (9,649)
Estimated Fair Value 121,735 97,411
Debt securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 132,236 132,215
Gross Unrealized Loss (7,420) (7,590)
Estimated Fair Value 124,816 124,625
Total U.S. government agency and sponsored agency obligations    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 813,309 803,555
Gross Unrealized Gain 333 718
Gross Unrealized Loss (95,198) (91,918)
Estimated Fair Value 718,444 712,355
Municipal bonds-tax exempt    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 76,864 77,121
Gross Unrealized Loss (10,422) (9,225)
Estimated Fair Value $ 66,442 $ 67,896