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Non-interest Income and Expense - Components of Noninterest Expense (Detail) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Other Income and Expenses [Abstract]                      
Base salaries, net of deferred loan origination costs                 $ 70,164 $ 70,218 $ 62,422
Incentive compensation                 10,022 13,106 11,147
Benefits and other compensation costs                 31,935 22,741 20,373
Total salaries and benefits expense                 112,121 106,065 93,942
Occupancy                 14,528 14,893 12,139
Data processing and software                 13,504 13,517 11,021
Equipment                 5,704 7,022 6,651
ATM and POS network charges                 5,433 5,447 5,271
Merger and acquisition expense                 0 0 5,227
Advertising                 2,827 5,633 4,578
Professional fees                 3,222 3,754 3,546
Intangible amortization                 5,724 5,723 3,499
Telecommunications                 2,601 3,190 3,023
Regulatory assessments and insurance                 1,594 1,188 1,906
Courier service                 1,414 1,308 1,287
Operational losses                 1,168 986 1,260
Postage                 1,068 1,258 1,154
Gain on sale or acquisition of foreclosed assets                 (235) (246) (408)
Loss on disposal of fixed assets                 67 82 185
Other miscellaneous expense                 12,018 15,637 14,191
Total other noninterest expense                 70,637 79,392 74,530
Total noninterest expense $ 45,745 $ 46,714 $ 45,550 $ 44,749 $ 46,964 $ 46,344 $ 46,697 $ 45,452 $ 182,758 $ 185,457 $ 168,472