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Loans and Leases - Summary of Impaired Loans and Lease, by Class (Detail) - USD ($)
$ in Thousands
 6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Financial Receivables Impaired Or Restructured [Line Items]    
Unpaid Contractual Principal Balance $ 100,672 $ 84,525
Recorded Investment With No Specific Reserve 69,983 64,374
Recorded Investment With Specific Reserve 16,800 6,315
Total Recorded Investment 86,783 70,689
Specific Reserve 6,850 2,650
Average Recorded Investment 83,499 68,950
Commercial Real Estate [Member]    
Financial Receivables Impaired Or Restructured [Line Items]    
Unpaid Contractual Principal Balance 32,295 33,780
Recorded Investment With No Specific Reserve 22,983 24,423
Recorded Investment With Specific Reserve 2,101 772
Total Recorded Investment 25,084 25,195
Specific Reserve 234 321
Average Recorded Investment 25,319 26,143
Commercial and Industrial [Member]    
Financial Receivables Impaired Or Restructured [Line Items]    
Unpaid Contractual Principal Balance 29,126 15,860
Recorded Investment With No Specific Reserve 12,826 9,176
Recorded Investment With Specific Reserve 14,699 5,543
Total Recorded Investment 27,525 14,719
Specific Reserve 6,616 2,329
Average Recorded Investment 26,023 12,298
Commercial Leases [Member]    
Financial Receivables Impaired Or Restructured [Line Items]    
Unpaid Contractual Principal Balance 1,142 659
Recorded Investment With No Specific Reserve 1,142 659
Total Recorded Investment 1,142 659
Average Recorded Investment   747
Total Commercial Loans and Leases [Member]    
Financial Receivables Impaired Or Restructured [Line Items]    
Unpaid Contractual Principal Balance 62,563 50,299
Recorded Investment With No Specific Reserve 36,951 34,258
Recorded Investment With Specific Reserve 16,800 6,315
Total Recorded Investment 53,751 40,573
Specific Reserve 6,850 2,650
Average Recorded Investment 51,342 39,188
Direct Installment [Member]    
Financial Receivables Impaired Or Restructured [Line Items]    
Unpaid Contractual Principal Balance 16,125 14,679
Recorded Investment With No Specific Reserve 14,865 13,792
Total Recorded Investment 14,865 13,792
Average Recorded Investment 14,481 13,267
Residential Mortgages [Member]    
Financial Receivables Impaired Or Restructured [Line Items]    
Unpaid Contractual Principal Balance 13,942 13,394
Recorded Investment With No Specific Reserve 13,385 12,763
Total Recorded Investment 13,385 12,763
Average Recorded Investment 13,093 12,896
Indirect Installment [Member]    
Financial Receivables Impaired Or Restructured [Line Items]    
Unpaid Contractual Principal Balance 4,266 3,745
Recorded Investment With No Specific Reserve 1,772 1,514
Total Recorded Investment 1,772 1,514
Average Recorded Investment 1,636 1,401
Consumer Lines of Credit [Member]    
Financial Receivables Impaired Or Restructured [Line Items]    
Unpaid Contractual Principal Balance 3,776 2,408
Recorded Investment With No Specific Reserve 3,010 2,047
Total Recorded Investment 3,010 2,047
Average Recorded Investment $ 2,947 $ 2,198