Quarterly report [Sections 13 or 15(d)]

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

v3.26.1
Securities - Summary of Investment Securities Available for Sale (Detail) - USD ($)
$ in Thousands
Mar. 31, 2026
Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 900,018 $ 941,760
Gross Unrealized Gain 1,798 3,108
Gross Unrealized Loss (66,091) (64,244)
Estimated Fair Value 835,725 880,624
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 128,708 128,569
Gross Unrealized Gain 107 298
Gross Unrealized Loss (224) (157)
Estimated Fair Value 128,591 128,710
Mortgage-backed securities - residential    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 399,917 411,223
Gross Unrealized Gain 608 926
Gross Unrealized Loss (39,165) (38,741)
Estimated Fair Value 361,360 373,408
Mortgage-backed securities - commercial    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 74,289 71,751
Gross Unrealized Gain 75 116
Gross Unrealized Loss (11,466) (11,295)
Estimated Fair Value 62,898 60,572
Collateralized mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 169,268 188,120
Gross Unrealized Gain 1,008 1,768
Gross Unrealized Loss (6,117) (5,933)
Estimated Fair Value 164,159 183,955
Debt securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 53,062 67,059
Gross Unrealized Loss (779) (1,105)
Estimated Fair Value 52,283 65,954
Total U.S. government agency and sponsored agency obligations    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 696,536 738,153
Gross Unrealized Gain 1,691 2,810
Gross Unrealized Loss (57,527) (57,074)
Estimated Fair Value 640,700 683,889
Municipal bonds-tax exempt    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 74,774 75,038
Gross Unrealized Loss (8,340) (7,013)
Estimated Fair Value $ 66,434 $ 68,025