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Credit Quality - Schedule of Age Analysis of its Past Due Loans, Segregated by Class of Loans (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans, 30-89 Days Past Due $ 84,067 $ 76,551
Loans, Total Past Due 221,339 226,119
Loans, Current & Other 13,307,669 12,801,218
Total Financing Receivables 13,529,008 13,027,337
Loans, Recorded Investment >90 Days & Accruing 16,506 9,897
Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans, Total Past Due 137,272 149,568
Construction & Land Development [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans, 30-89 Days Past Due 2,910 1,615
Loans, Total Past Due 20,255 18,805
Loans, Current & Other 1,376,598 1,486,102
Total Financing Receivables 1,396,853 1,504,907
Loans, Recorded Investment >90 Days & Accruing 802 385
Construction & Land Development [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans, Total Past Due 17,345 17,190
Commercial Real Estate [Member] | Owner-Occupied [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans, 30-89 Days Past Due 13,261 7,968
Loans, Total Past Due 31,863 21,631
Loans, Current & Other 1,334,951 1,339,998
Total Financing Receivables 1,366,814 1,361,629
Loans, Recorded Investment >90 Days & Accruing 1,377 458
Commercial Real Estate [Member] | Owner-Occupied [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans, Total Past Due 18,602 13,663
Commercial Real Estate [Member] | Nonowner-Occupied [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans, 30-89 Days Past Due 14,118 10,398
Loans, Total Past Due 31,042 30,846
Loans, Current & Other 4,404,868 4,420,452
Total Financing Receivables 4,435,910 4,451,298
Loans, Recorded Investment >90 Days & Accruing 1,301 634
Commercial Real Estate [Member] | Nonowner-Occupied [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans, Total Past Due 16,924 20,448
Other Commercial [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans, 30-89 Days Past Due 9,598 11,533
Loans, Total Past Due 64,160 80,009
Loans, Current & Other 2,145,031 1,918,970
Total Financing Receivables 2,209,191 1,998,979
Loans, Recorded Investment >90 Days & Accruing 2,313 940
Other Commercial [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans, Total Past Due 54,562 68,476
Residential Real Estate [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans, 30-89 Days Past Due 37,135 35,300
Loans, Total Past Due 65,840 63,937
Loans, Current & Other 3,234,632 2,932,234
Total Financing Receivables 3,300,472 2,996,171
Loans, Recorded Investment >90 Days & Accruing 9,866 6,519
Residential Real Estate [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans, Total Past Due 28,705 28,637
Consumer [Member] | Bankcard [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans, 30-89 Days Past Due 427 449
Loans, Total Past Due 592 635
Loans, Current & Other 9,125 9,679
Total Financing Receivables 9,717 10,314
Loans, Recorded Investment >90 Days & Accruing 165 186
Consumer [Member] | Bankcard [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans, Total Past Due 165 186
Consumer [Member] | Other Consumer [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans, 30-89 Days Past Due 6,618 9,288
Loans, Total Past Due 7,587 10,256
Loans, Current & Other 802,464 693,783
Total Financing Receivables 810,051 704,039
Loans, Recorded Investment >90 Days & Accruing 682 775
Consumer [Member] | Other Consumer [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member]    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Loans, Total Past Due $ 969 $ 968