Quarterly report [Sections 13 or 15(d)]

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

v3.25.1
Securities - Summary of Investment Securities Available for Sale (Detail) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost $ 991,234 $ 1,004,563
Gross Unrealized Gain 2,127 901
Gross Unrealized Loss (86,350) (99,666)
Estimated Fair Value 907,011 905,798
U.S. Treasury securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 89,726 89,208
Gross Unrealized Gain 281 242
Gross Unrealized Loss (376) (521)
Estimated Fair Value 89,631 88,929
Mortgage-backed securities - residential    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 439,368 453,993
Gross Unrealized Gain 471 222
Gross Unrealized Loss (52,001) (61,643)
Estimated Fair Value 387,838 392,572
Mortgage-backed securities - commercial    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 74,491 75,947
Gross Unrealized Gain 92 24
Gross Unrealized Loss (12,031) (13,055)
Estimated Fair Value 62,552 62,916
Collateralized mortgage obligations    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 195,041 182,553
Gross Unrealized Gain 1,271 404
Gross Unrealized Loss (7,783) (9,401)
Estimated Fair Value 188,529 173,556
Debt securities    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 116,783 126,776
Gross Unrealized Gain 12 9
Gross Unrealized Loss (2,891) (3,969)
Estimated Fair Value 113,904 122,816
Total U.S. government agency and sponsored agency obligations    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 825,683 839,269
Gross Unrealized Gain 1,846 659
Gross Unrealized Loss (74,706) (88,068)
Estimated Fair Value 752,823 751,860
Municipal bonds-tax exempt    
Debt Securities, Available-for-sale [Line Items]    
Amortized Cost 75,825 76,086
Gross Unrealized Loss (11,268) (11,077)
Estimated Fair Value $ 64,557 $ 65,009