Securities - Summary of Investment Securities Available for Sale (Detail) - USD ($) $ in Thousands	Jun. 30, 2026	Dec. 31, 2025
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 962,255	$ 941,760
Gross Unrealized Gain	1,065	3,108
Gross Unrealized Loss	(66,710)	(64,244)
Estimated Fair Value	896,610	880,624
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	211,878	128,569
Gross Unrealized Gain	24	298
Gross Unrealized Loss	(485)	(157)
Estimated Fair Value	211,417	128,710
Mortgage-backed securities - residential
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	394,720	411,223
Gross Unrealized Gain	538	926
Gross Unrealized Loss	(40,430)	(38,741)
Estimated Fair Value	354,828	373,408
Mortgage-backed securities - commercial
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	73,852	71,751
Gross Unrealized Gain	17	116
Gross Unrealized Loss	(11,669)	(11,295)
Estimated Fair Value	62,200	60,572
Collateralized mortgage obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	164,731	188,120
Gross Unrealized Gain	486	1,768
Gross Unrealized Loss	(6,265)	(5,933)
Estimated Fair Value	158,952	183,955
Debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	42,565	67,059
Gross Unrealized Loss	(539)	(1,105)
Estimated Fair Value	42,026	65,954
Total U.S. government agency and sponsored agency obligations
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	675,868	738,153
Gross Unrealized Gain	1,041	2,810
Gross Unrealized Loss	(58,903)	(57,074)
Estimated Fair Value	618,006	683,889
Municipal bonds-tax exempt
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	74,509	75,038
Gross Unrealized Loss	(7,322)	(7,013)
Estimated Fair Value	$ 67,187	$ 68,025

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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