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Loans - Impaired Loans (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance $ 56,947 $ 57,609
Recorded Investment With Related Allowance 89,420 87,399
Total Recorded Investment 146,367 145,008
Unpaid Contractual Principal Balance 162,965 158,936
Related Allowance 10,651 12,525
Commercial real estate loans    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 42,259 44,286
Recorded Investment With Related Allowance 51,667 47,012
Total Recorded Investment 93,926 91,298
Unpaid Contractual Principal Balance 103,070 97,701
Related Allowance 4,682 5,502
Consumer loans    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 269 235
Recorded Investment With Related Allowance 4,444 2,911
Total Recorded Investment 4,713 3,146
Unpaid Contractual Principal Balance 4,814 3,247
Related Allowance 818 465
Commercial and industrial    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 6,728 6,579
Recorded Investment With Related Allowance 18,111 21,645
Total Recorded Investment 24,839 28,224
Unpaid Contractual Principal Balance 30,242 33,677
Related Allowance 3,724 4,929
Commercial real estate    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 30,139 29,784
Recorded Investment With Related Allowance 47,068 44,713
Total Recorded Investment 77,207 74,497
Unpaid Contractual Principal Balance 81,357 77,007
Related Allowance 4,344 5,342
Construction    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 12,120 14,502
Recorded Investment With Related Allowance 4,599 2,299
Total Recorded Investment 16,719 16,801
Unpaid Contractual Principal Balance 21,713 20,694
Related Allowance 338 160
Residential mortgage    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 7,691 6,509
Recorded Investment With Related Allowance 15,198 15,831
Total Recorded Investment 22,889 22,340
Unpaid Contractual Principal Balance 24,839 24,311
Related Allowance 1,427 1,629
Home equity    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 269 235
Recorded Investment With Related Allowance 4,444 2,911
Total Recorded Investment 4,713 3,146
Unpaid Contractual Principal Balance 4,814 3,247
Related Allowance $ 818 $ 465