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Loans - Impaired Loans (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance $ 54,928 $ 57,609
Recorded Investment With Related Allowance 77,460 87,399
Total Recorded Investment 132,388 145,008
Unpaid Contractual Principal Balance 145,473 158,936
Related Allowance 8,782 12,525
Commercial and industrial [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 7,863 6,579
Recorded Investment With Related Allowance 17,851 21,645
Total Recorded Investment 25,714 28,224
Unpaid Contractual Principal Balance 33,071 33,677
Related Allowance 3,439 4,929
Commercial real estate [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 38,960 44,286
Recorded Investment With Related Allowance 42,970 47,012
Total Recorded Investment 81,930 91,298
Unpaid Contractual Principal Balance 85,650 97,701
Related Allowance 3,671 5,502
Commercial real estate [Member] | Commercial real estate [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 30,113 29,784
Recorded Investment With Related Allowance 37,440 44,713
Total Recorded Investment 67,553 74,497
Unpaid Contractual Principal Balance 71,263 77,007
Related Allowance 3,354 5,342
Commercial real estate [Member] | Construction [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 8,847 14,502
Recorded Investment With Related Allowance 5,530 2,299
Total Recorded Investment 14,377 16,801
Unpaid Contractual Principal Balance 14,387 20,694
Related Allowance 317 160
Residential mortgage [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 7,842 6,509
Recorded Investment With Related Allowance 14,770 15,831
Total Recorded Investment 22,612 22,340
Unpaid Contractual Principal Balance 24,528 24,311
Related Allowance 1,377 1,629
Consumer [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 263 235
Recorded Investment With Related Allowance 1,869 2,911
Total Recorded Investment 2,132 3,146
Unpaid Contractual Principal Balance 2,224 3,247
Related Allowance 295 465
Consumer [Member] | Home equity [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 263 235
Recorded Investment With Related Allowance 1,869 2,911
Total Recorded Investment 2,132 3,146
Unpaid Contractual Principal Balance 2,224 3,247
Related Allowance $ 295 $ 465