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Loans - Impaired Loans (Detail) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance $ 48,605 $ 36,125
Recorded Investment With Related Allowance 97,388 78,694
Total Recorded Investment 145,993 114,819
Unpaid Contractual Principal Balance 155,019 123,559
Related Allowance 10,348 10,531
Commercial and industrial    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 3,933 3,609
Recorded Investment With Related Allowance 56,304 27,031
Total Recorded Investment 60,237 30,640
Unpaid Contractual Principal Balance 65,809 35,957
Related Allowance 6,746 5,864
Commercial Real Estate    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 33,320 22,936
Recorded Investment With Related Allowance 32,696 39,353
Total Recorded Investment 66,016 62,289
Unpaid Contractual Principal Balance 68,079 64,264
Related Allowance 2,969 3,872
Commercial Real Estate | Commercial real estate    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 32,641 21,318
Recorded Investment With Related Allowance 30,629 36,974
Total Recorded Investment 63,270 58,292
Unpaid Contractual Principal Balance 65,333 60,267
Related Allowance 2,751 3,612
Commercial Real Estate | Construction    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 679 1,618
Recorded Investment With Related Allowance 2,067 2,379
Total Recorded Investment 2,746 3,997
Unpaid Contractual Principal Balance 2,746 3,997
Related Allowance 218 260
Residential mortgage    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 8,464 8,398
Recorded Investment With Related Allowance 7,725 9,958
Total Recorded Investment 16,189 18,356
Unpaid Contractual Principal Balance 17,488 19,712
Related Allowance 582 725
Consumer    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 2,888 1,182
Recorded Investment With Related Allowance 663 2,352
Total Recorded Investment 3,551 3,534
Unpaid Contractual Principal Balance 3,643 3,626
Related Allowance 51 70
Consumer | Home equity    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 2,888 1,182
Recorded Investment With Related Allowance 663 2,352
Total Recorded Investment 3,551 3,534
Unpaid Contractual Principal Balance 3,643 3,626
Related Allowance $ 51 $ 70