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Non-interest Income and Expense - Components of Non-Interest Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Schedule Of Other Noninterest Income And Expense [Line Items]    
Total service charges and fees $ 10,476 $ 9,126
Increase in cash value of life insurance 673 720
Asset management and commission income 834 916
Gain on sale of loans 3,247 891
Lease brokerage income 110 193
Sale of customer checks 119 124
Gain on sale of investment securities 0 0
(Loss) gain on marketable equity securities (53) 47
Other 704 (197)
Total other non-interest income 5,634 2,694
Total non-interest income 16,110 11,820
ATM and interchange fees    
Schedule Of Other Noninterest Income And Expense [Line Items]    
Total service charges and fees 5,861 5,111
Service charges on deposit accounts    
Schedule Of Other Noninterest Income And Expense [Line Items]    
Total service charges and fees 3,269 4,046
Other service fees    
Schedule Of Other Noninterest Income And Expense [Line Items]    
Total service charges and fees 871 758
Mortgage banking service fees    
Schedule Of Other Noninterest Income And Expense [Line Items]    
Total service charges and fees 463 469
Change in value of mortgage servicing rights    
Schedule Of Other Noninterest Income And Expense [Line Items]    
Total service charges and fees $ 12 $ (1,258)