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Loans and Leases - Summary of Impaired Loans and Lease, by Class (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Financial Receivables Impaired Or Restructured [Line Items]    
Unpaid Contractual Principal Balance $ 84,525 $ 81,765
Recorded Investment With No Specific Reserve 64,374 66,619
Recorded Investment With Specific Reserve 6,315 2,831
Total Recorded Investment 70,689 69,450
Specific Reserve 2,650 1,179
Average Recorded Investment 68,950 75,367
Commercial Real Estate [Member]    
Financial Receivables Impaired Or Restructured [Line Items]    
Unpaid Contractual Principal Balance 33,780 34,583
Recorded Investment With No Specific Reserve 24,423 25,443
Recorded Investment With Specific Reserve 772 883
Total Recorded Investment 25,195 26,326
Specific Reserve 321 399
Average Recorded Investment 26,143 30,807
Commercial and Industrial [Member]    
Financial Receivables Impaired Or Restructured [Line Items]    
Unpaid Contractual Principal Balance 15,860 11,412
Recorded Investment With No Specific Reserve 9,176 7,609
Recorded Investment With Specific Reserve 5,543 1,948
Total Recorded Investment 14,719 9,557
Specific Reserve 2,329 780
Average Recorded Investment 12,298 9,510
Commercial Leases [Member]    
Financial Receivables Impaired Or Restructured [Line Items]    
Unpaid Contractual Principal Balance 659 722
Recorded Investment With No Specific Reserve 659 722
Total Recorded Investment 659 722
Average Recorded Investment 747 686
Total Commercial Loans and Leases [Member]    
Financial Receivables Impaired Or Restructured [Line Items]    
Unpaid Contractual Principal Balance 50,299 46,717
Recorded Investment With No Specific Reserve 34,258 33,774
Recorded Investment With Specific Reserve 6,315 2,831
Total Recorded Investment 40,573 36,605
Specific Reserve 2,650 1,179
Average Recorded Investment 39,188 41,003
Direct Installment [Member]    
Financial Receivables Impaired Or Restructured [Line Items]    
Unpaid Contractual Principal Balance 14,679 14,987
Recorded Investment With No Specific Reserve 13,792 14,680
Total Recorded Investment 13,792 14,680
Average Recorded Investment 13,267 14,248
Residential Mortgages [Member]    
Financial Receivables Impaired Or Restructured [Line Items]    
Unpaid Contractual Principal Balance 13,394 16,791
Recorded Investment With No Specific Reserve 12,763 15,064
Total Recorded Investment 12,763 15,064
Average Recorded Investment 12,896 16,924
Indirect Installment [Member]    
Financial Receivables Impaired Or Restructured [Line Items]    
Unpaid Contractual Principal Balance 3,745 1,467
Recorded Investment With No Specific Reserve 1,514 1,305
Total Recorded Investment 1,514 1,305
Average Recorded Investment 1,401 1,399
Consumer Lines of Credit [Member]    
Financial Receivables Impaired Or Restructured [Line Items]    
Unpaid Contractual Principal Balance 2,408 1,803
Recorded Investment With No Specific Reserve 2,047 1,796
Total Recorded Investment 2,047 1,796
Average Recorded Investment $ 2,198 $ 1,793