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Loans - Impaired Loans (Detail) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance $ 56,040 $ 57,609
Recorded Investment With Related Allowance 87,299 87,399
Total Recorded Investment 143,339 145,008
Unpaid Contractual Principal Balance 144,554 158,936
Related Allowance 11,077 12,525
Commercial real estate loans    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 41,734 44,286
Recorded Investment With Related Allowance 47,700 47,012
Total Recorded Investment 89,434 91,298
Unpaid Contractual Principal Balance 93,143 97,701
Related Allowance 4,536 5,502
Consumer loans    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 413 235
Recorded Investment With Related Allowance 2,684 2,911
Total Recorded Investment 3,097 3,146
Unpaid Contractual Principal Balance 3,175 3,247
Related Allowance 463 465
Commercial and industrial    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 6,624 6,579
Recorded Investment With Related Allowance 20,760 21,645
Total Recorded Investment 27,384 28,224
Unpaid Contractual Principal Balance 32,070 33,677
Related Allowance 4,446 4,929
Commercial real estate    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 28,833 29,784
Recorded Investment With Related Allowance 42,947 44,713
Total Recorded Investment 71,780 74,497
Unpaid Contractual Principal Balance 75,489 77,007
Related Allowance 4,187 5,342
Construction    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 12,901 14,502
Recorded Investment With Related Allowance 4,753 2,299
Total Recorded Investment 17,654 16,801
Unpaid Contractual Principal Balance 17,654 20,694
Related Allowance 349 160
Residential mortgage    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 7,269 6,509
Recorded Investment With Related Allowance 16,155 15,831
Total Recorded Investment 23,424 22,340
Unpaid Contractual Principal Balance 16,166 24,311
Related Allowance 1,632 1,629
Home equity    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 413 235
Recorded Investment With Related Allowance 2,684 2,911
Total Recorded Investment 3,097 3,146
Unpaid Contractual Principal Balance 3,175 3,247
Related Allowance $ 463 $ 465