Non-interest Income and Expense - Components of Other Noninterest Income (Detail) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Schedule Of Other Noninterest Income And Expense [Line Items]
Total service charges and fees									$ 43,948	$ 37,981	$ 40,417
Commissions on sale of non-deposit investment products									3,668	2,989	2,877
Increase in cash value of life insurance									2,775	2,949	3,029
Gain on sale of loans									9,580	9,122	3,282
Lease brokerage income									746	668	878
Sale of customer checks									459	414	529
Gain on sale of investment securities									0	7	110
Gain (loss) on marketable equity securities									(86)	64	86
Other									2,574	1,000	2,312
Total other noninterest income									19,716	17,213	13,103
Total noninterest income	$ 16,502	$ 15,095	$ 15,957	$ 16,110	$ 16,580	$ 15,137	$ 11,657	$ 11,820	63,664	55,194	53,520
ATM and interchange fees
Schedule Of Other Noninterest Income And Expense [Line Items]
Total service charges and fees									25,356	21,660	20,639
Service charges on deposit accounts
Schedule Of Other Noninterest Income And Expense [Line Items]
Total service charges and fees									14,013	13,944	16,657
Other service fees
Schedule Of Other Noninterest Income And Expense [Line Items]
Total service charges and fees									3,570	3,156	3,015
Mortgage banking service fees
Schedule Of Other Noninterest Income And Expense [Line Items]
Total service charges and fees									1,881	1,855	1,917
Change in value of mortgage loan servicing rights
Schedule Of Other Noninterest Income And Expense [Line Items]
Total service charges and fees									$ (872)	$ (2,634)	$ (1,811)