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Loans - Impaired Loans (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance $ 53,011 $ 36,125
Recorded Investment With Related Allowance 97,407 78,694
Total Recorded Investment 150,418 114,819
Unpaid Contractual Principal Balance 157,233 123,559
Related Allowance 10,550 10,531
Commercial and industrial    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 12,580 3,609
Recorded Investment With Related Allowance 56,364 27,031
Total Recorded Investment 68,944 30,640
Unpaid Contractual Principal Balance 72,680 35,957
Related Allowance 7,104 5,864
Commercial real estate    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 33,733 22,936
Recorded Investment With Related Allowance 30,179 39,353
Total Recorded Investment 63,912 62,289
Unpaid Contractual Principal Balance 65,831 64,264
Related Allowance 2,644 3,872
Commercial real estate | Commercial real estate    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 31,058 21,318
Recorded Investment With Related Allowance 29,709 36,974
Total Recorded Investment 60,767 58,292
Unpaid Contractual Principal Balance 62,686 60,267
Related Allowance 2,626 3,612
Commercial real estate | Construction    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 2,675 1,618
Recorded Investment With Related Allowance 470 2,379
Total Recorded Investment 3,145 3,997
Unpaid Contractual Principal Balance 3,145 3,997
Related Allowance 18 260
Residential mortgage    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 5,620 8,398
Recorded Investment With Related Allowance 8,693 9,958
Total Recorded Investment 14,313 18,356
Unpaid Contractual Principal Balance 15,343 19,712
Related Allowance 733 725
Consumer loans    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 1,078 1,182
Recorded Investment With Related Allowance 2,171 2,352
Total Recorded Investment 3,249 3,534
Unpaid Contractual Principal Balance 3,379 3,626
Related Allowance 69 70
Consumer loans | Home equity    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 1,078 1,182
Recorded Investment With Related Allowance 2,171 2,352
Total Recorded Investment 3,249 3,534
Unpaid Contractual Principal Balance 3,379 3,626
Related Allowance $ 69 $ 70