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LOANS - Loan Delinquency, including Nonaccrual Loans (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, Past Due $ 27,942 $ 15,970
Current 5,880,281 5,603,463
Loans and Leases Receivable, Gross 5,908,223 5,619,433
Purchased impaired loans, carrying balance 104,960 138,049
Total loans and leases 6,013,183 5,757,482
Greater than 90 days past due and still accruing 62 2,871
30 to 59 days past due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, Past Due 6,896 3,668
60 to 89 days past due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, Past Due 3,179 702
Greater than 90 days past due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, Past Due 17,867 11,600
Commercial    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, Past Due 7,490 2,804
Current 1,901,821 1,773,939
Loans and Leases Receivable, Gross 1,909,311 1,776,743
Purchased impaired loans, carrying balance 3,432 5,205
Total loans and leases 1,912,743 1,781,948
Greater than 90 days past due and still accruing 0 0
Commercial | 30 to 59 days past due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, Past Due 755 1,257
Commercial | 60 to 89 days past due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, Past Due 1,657 208
Commercial | Greater than 90 days past due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, Past Due 5,078 1,339
Lease financing    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, Past Due 485 252
Current 88,862 92,856
Loans and Leases Receivable, Gross 89,347 93,108
Purchased impaired loans, carrying balance 0 0
Total loans and leases 89,347 93,108
Greater than 90 days past due and still accruing 0 0
Lease financing | 30 to 59 days past due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, Past Due 485 137
Lease financing | 60 to 89 days past due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, Past Due 0 0
Lease financing | Greater than 90 days past due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, Past Due 0 115
Construction real estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, Past Due 234 0
Current 467,216 398,877
Loans and Leases Receivable, Gross 467,450 398,877
Purchased impaired loans, carrying balance 280 557
Total loans and leases 467,730 399,434
Greater than 90 days past due and still accruing 0 0
Construction real estate | 30 to 59 days past due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, Past Due 234 0
Construction real estate | 60 to 89 days past due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, Past Due 0 0
Construction real estate | Greater than 90 days past due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, Past Due 0 0
Commercial real estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, Past Due 10,694 6,500
Current 2,419,969 2,339,327
Loans and Leases Receivable, Gross 2,430,663 2,345,827
Purchased impaired loans, carrying balance 59,428 81,750
Total loans and leases 2,490,091 2,427,577
Greater than 90 days past due and still accruing 0 2,729
Commercial real estate | 30 to 59 days past due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, Past Due 1,716 777
Commercial real estate | 60 to 89 days past due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, Past Due 201 134
Commercial real estate | Greater than 90 days past due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, Past Due 8,777 5,589
Residential real estate    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, Past Due 3,329 3,239
Current 430,500 450,631
Loans and Leases Receivable, Gross 433,829 453,870
Purchased impaired loans, carrying balance 37,562 47,110
Total loans and leases 471,391 500,980
Greater than 90 days past due and still accruing 0 0
Residential real estate | 30 to 59 days past due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, Past Due 526 821
Residential real estate | 60 to 89 days past due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, Past Due 811 37
Residential real estate | Greater than 90 days past due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, Past Due 1,992 2,381
Home equity    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, Past Due 4,863 2,116
Current 485,127 456,143
Loans and Leases Receivable, Gross 489,990 458,259
Purchased impaired loans, carrying balance 3,614 2,129
Total loans and leases 493,604 460,388
Greater than 90 days past due and still accruing 0 0
Home equity | 30 to 59 days past due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, Past Due 2,716 195
Home equity | 60 to 89 days past due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, Past Due 394 145
Home equity | Greater than 90 days past due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, Past Due 1,753 1,776
Installment    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, Past Due 413 283
Current 40,529 49,058
Loans and Leases Receivable, Gross 40,942 49,341
Purchased impaired loans, carrying balance 644 1,298
Total loans and leases 41,586 50,639
Greater than 90 days past due and still accruing 0 0
Installment | 30 to 59 days past due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, Past Due 179 24
Installment | 60 to 89 days past due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, Past Due 29 1
Installment | Greater than 90 days past due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, Past Due 205 258
Credit card    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, Past Due 434 776
Current 46,257 42,632
Loans and Leases Receivable, Gross 46,691 43,408
Purchased impaired loans, carrying balance 0 0
Total loans and leases 46,691 43,408
Greater than 90 days past due and still accruing 62 142
Credit card | 30 to 59 days past due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, Past Due 285 457
Credit card | 60 to 89 days past due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, Past Due 87 177
Credit card | Greater than 90 days past due    
Financing Receivable, Recorded Investment, Past Due [Line Items]    
Financing receivables, Past Due $ 62 $ 142