Non-interest Income and Expense - Components of Non-Interest Income (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Schedule Of Other Noninterest Income And Expense [Line Items]
Total service charges and fees	$ 13,075	$ 12,682	$ 37,240	$ 37,422
Increase in cash value of life insurance	684	659	2,274	2,049
Asset management and commission income	1,141	1,020	3,233	2,946
Gain on sale of loans	382	357	883	2,145
Lease brokerage income	160	252	332	648
Sale of customer checks	396	326	1,091	871
Loss on sale of investment securities	0	0	(164)	0
Loss on marketable equity securities	(81)	(115)	(81)	(346)
Other	227	459	552	1,431
Total other non-interest income	2,909	2,958	8,120	9,744
Total non-interest income	15,984	15,640	45,360	47,166
ATM and interchange fees
Schedule Of Other Noninterest Income And Expense [Line Items]
Total service charges and fees	6,728	6,714	19,928	19,941
Service charges on deposit accounts
Schedule Of Other Noninterest Income And Expense [Line Items]
Total service charges and fees	4,851	4,436	12,863	12,433
Other service fees
Schedule Of Other Noninterest Income And Expense [Line Items]
Total service charges and fees	1,142	1,022	3,300	3,183
Mortgage banking service fees
Schedule Of Other Noninterest Income And Expense [Line Items]
Total service charges and fees	445	477	1,364	1,422
Change in value of mortgage servicing rights
Schedule Of Other Noninterest Income And Expense [Line Items]
Total service charges and fees	$ (91)	$ 33	$ (215)	$ 443