Non-interest Income and Expense - Components of Other Noninterest Income (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Schedule Of Other Noninterest Income And Expense [Line Items]
Total service charges and fees									$ 49,765	$ 43,948	$ 37,981
Asset management and commission income									3,986	3,668	2,989
Increase in cash value of life insurance									2,858	2,775	2,949
Gain on sale of loans									2,342	9,580	9,122
Lease brokerage income									820	746	668
Sale of customer checks									1,167	459	414
Gain on sale of investment securities									0	0	7
Gain (loss) on marketable equity securities									(340)	(86)	64
Other									2,448	2,574	1,000
Total other noninterest income									13,281	19,716	17,213
Total noninterest income	$ 15,880	$ 15,640	$ 16,430	$ 15,096	$ 16,502	$ 15,095	$ 15,957	$ 16,110	63,046	63,664	55,194
ATM and interchange fees
Schedule Of Other Noninterest Income And Expense [Line Items]
Total service charges and fees									26,767	25,356	21,660
Service charges on deposit accounts
Schedule Of Other Noninterest Income And Expense [Line Items]
Total service charges and fees									16,536	14,013	13,944
Other service fees
Schedule Of Other Noninterest Income And Expense [Line Items]
Total service charges and fees									4,274	3,570	3,156
Mortgage banking service fees
Schedule Of Other Noninterest Income And Expense [Line Items]
Total service charges and fees									1,887	1,881	1,855
Change in value of mortgage loan servicing rights
Schedule Of Other Noninterest Income And Expense [Line Items]
Total service charges and fees									$ 301	$ (872)	$ (2,634)