Quarterly report [Sections 13 or 15(d)]

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

v3.25.3
Securities - Summary of Investment Securities Available for Sale (Detail) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 972,365 $ 1,004,563
Gross Unrealized Gain 2,961 901
Gross Unrealized Loss (70,605) (99,666)
Estimated Fair Value 904,721 905,798
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 131,971 89,208
Gross Unrealized Gain 307 242
Gross Unrealized Loss (234) (521)
Estimated Fair Value 132,044 88,929
Mortgage-backed securities - residential    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 419,013 453,993
Gross Unrealized Gain 771 222
Gross Unrealized Loss (42,608) (61,643)
Estimated Fair Value 377,176 392,572
Mortgage-backed securities - commercial    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 72,866 75,947
Gross Unrealized Gain 94 24
Gross Unrealized Loss (11,863) (13,055)
Estimated Fair Value 61,097 62,916
Collateralized mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 199,248 182,553
Gross Unrealized Gain 1,781 404
Gross Unrealized Loss (6,446) (9,401)
Estimated Fair Value 194,583 173,556
Debt securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 73,966 126,776
Gross Unrealized Gain 8 9
Gross Unrealized Loss (1,558) (3,969)
Estimated Fair Value 72,416 122,816
Total U.S. government agency and sponsored agency obligations    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 765,093 839,269
Gross Unrealized Gain 2,654 659
Gross Unrealized Loss (62,475) (88,068)
Estimated Fair Value 705,272 751,860
Municipal bonds-tax exempt    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 75,301 76,086
Gross Unrealized Loss (7,896) (11,077)
Estimated Fair Value $ 67,405 $ 65,009