Allowance for Credit Losses - Schedule of Accrued Interest Receivables Written off by Reversing Interest (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
Accrued Interest Receivables And Written Off Status [Line Items]
Accrued Interest Receivables Written Off by Reversing Interest Income	$ 373	$ 1,193	$ 1,212	$ 2,200
Construction & land development [Member]
Accrued Interest Receivables And Written Off Status [Line Items]
Accrued Interest Receivables Written Off by Reversing Interest Income	0	9	76	216
Commercial real estate [Member] \| Owner-occupied [Member]
Accrued Interest Receivables And Written Off Status [Line Items]
Accrued Interest Receivables Written Off by Reversing Interest Income	1	0	5	68
Commercial real estate [Member] \| Nonowner-occupied [Member]
Accrued Interest Receivables And Written Off Status [Line Items]
Accrued Interest Receivables Written Off by Reversing Interest Income	289	1,112	553	1,212
Other commercial [Member]
Accrued Interest Receivables And Written Off Status [Line Items]
Accrued Interest Receivables Written Off by Reversing Interest Income	4	3	212	80
Residential real estate [Member]
Accrued Interest Receivables And Written Off Status [Line Items]
Accrued Interest Receivables Written Off by Reversing Interest Income	56	28	278	434
Consumer [Member] \| Bankcard [Member]
Accrued Interest Receivables And Written Off Status [Line Items]
Accrued Interest Receivables Written Off by Reversing Interest Income	0	0	0	0
Consumer [Member] \| Other consumer [Member]
Accrued Interest Receivables And Written Off Status [Line Items]
Accrued Interest Receivables Written Off by Reversing Interest Income	$ 23	$ 41	$ 88	$ 190