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Non-interest Income and Expense - Components of Non-Interest Income (Detail) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Schedule Of Other Noninterest Income And Expense [Line Items]        
Total service charges and fees $ 11,265 $ 10,469 $ 32,671 $ 27,763
Increase in cash value of life insurance 644 773 2,062 2,203
Asset management and commission income 957 667 2,738 2,244
Gain on sale of loans 1,814 3,035 7,908 5,662
Lease brokerage income 183 175 542 495
Sale of customer checks 107 91 342 303
Gain on sale of investment securities 0 7 0 7
Gain (loss) on marketable equity securities (14) 0 (59) 72
Other 139 (80) 958 (135)
Total other non-interest income 3,830 4,668 14,491 10,851
Total non-interest income 15,095 15,137 47,162 38,614
ATM and interchange fees        
Schedule Of Other Noninterest Income And Expense [Line Items]        
Total service charges and fees 6,516 5,637 18,935 15,913
Service charges on deposit accounts        
Schedule Of Other Noninterest Income And Expense [Line Items]        
Total service charges and fees 3,608 3,334 10,339 10,426
Other service fees        
Schedule Of Other Noninterest Income And Expense [Line Items]        
Total service charges and fees 897 805 2,682 2,296
Mortgage banking service fees        
Schedule Of Other Noninterest Income And Expense [Line Items]        
Total service charges and fees 476 457 1,406 1,386
Change in value of mortgage servicing rights        
Schedule Of Other Noninterest Income And Expense [Line Items]        
Total service charges and fees $ (232) $ 236 $ (691) $ (2,258)