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Goodwill and Other Intangibles - Changes In Intangible Assets (Detail) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Finite Lived Intangible Assets [Line Items]    
Gross carrying amount $ 123,571 $ 121,226
Accumulated amortization 109,106 106,810
Net carrying amount 14,465 14,416
Core Deposit Intangible Assets [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross carrying amount 50,059 50,059
Accumulated amortization 49,947 49,623
Net carrying amount 112 436
Customer Relationships [Member]    
Finite Lived Intangible Assets [Line Items]    
Gross carrying amount 73,512 71,167
Accumulated amortization 59,159 57,187
Net carrying amount $ 14,353 $ 13,980