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ALLOWANCE FOR LOAN AND LEASE LOSSES - Changes in the Allowance for Loan and Lease Losses (Detail) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Allowance for loan and lease losses:      
Balance at beginning of year $ 57,961 $ 53,398 $ 52,858
Provision for loan and lease losses 3,582 10,140 9,641
Loans charged-off 13,663 11,114 20,556
Recoveries 6,141 5,537 11,455
Total net charge-offs (7,522) (5,577) (9,101)
Balance at end of year 54,021 57,961 53,398
Ending allowance on loans individually evaluated for impairment 779 1,324  
Ending allowance on loans collectively evaluated for impairment 53,242 56,637  
Loans and Leases:      
Ending balance of loans individually evaluated for impairment 41,627 47,970  
Ending balance of loans collectively evaluated for impairment 5,971,556 5,709,512  
Loans and Leases Receivable, Net of Deferred Income 6,013,183 5,757,482  
Commercial      
Allowance for loan and lease losses:      
Balance at beginning of year 19,225 16,995 13,870
Provision for loan and lease losses 6,917 3,705 4,809
Loans charged-off 10,194 2,630 5,408
Recoveries 1,650 1,155 3,724
Total net charge-offs (8,544) (1,475) (1,684)
Balance at end of year 17,598 19,225 16,995
Ending allowance on loans individually evaluated for impairment 169 550  
Ending allowance on loans collectively evaluated for impairment 17,429 18,675  
Impaired Financing Receivable, Related Allowance 17,598 19,225  
Loans and Leases:      
Ending balance of loans individually evaluated for impairment 7,331 13,203  
Ending balance of loans collectively evaluated for impairment 1,905,412 1,768,745  
Loans and Leases Receivable, Net of Deferred Income 1,912,743 1,781,948  
Lease financing      
Allowance for loan and lease losses:      
Balance at beginning of year 716 821 435
Provision for loan and lease losses (42) (106) 384
Loans charged-off 0 0 0
Recoveries 1 1 2
Total net charge-offs 1 1 2
Balance at end of year 675 716 821
Ending allowance on loans individually evaluated for impairment 0 0  
Ending allowance on loans collectively evaluated for impairment 675 716  
Loans and Leases:      
Ending balance of loans individually evaluated for impairment 82 195  
Ending balance of loans collectively evaluated for impairment 89,265 92,913  
Loans and Leases Receivable, Net of Deferred Income 89,347 93,108  
Construction real estate      
Allowance for loan and lease losses:      
Balance at beginning of year 3,282 1,810 1,045
Provision for loan and lease losses 207 1,280 597
Loans charged-off 1 93 85
Recoveries 89 285 253
Total net charge-offs 88 192 168
Balance at end of year 3,577 3,282 1,810
Ending allowance on loans individually evaluated for impairment 0 0  
Ending allowance on loans collectively evaluated for impairment 3,577 3,282  
Impaired Financing Receivable, Related Allowance 3,577 3,282  
Loans and Leases:      
Ending balance of loans individually evaluated for impairment 29 0  
Ending balance of loans collectively evaluated for impairment 467,701 399,434  
Loans and Leases Receivable, Net of Deferred Income 467,730 399,434  
Commercial real estate      
Allowance for loan and lease losses:      
Balance at beginning of year 26,540 23,656 27,086
Provision for loan and lease losses (7,291) 5,365 1,439
Loans charged-off 1,038 4,983 10,083
Recoveries 2,719 2,502 5,214
Total net charge-offs 1,681 (2,481) (4,869)
Balance at end of year 20,930 26,540 23,656
Ending allowance on loans individually evaluated for impairment 448 593  
Ending allowance on loans collectively evaluated for impairment 20,482 25,947  
Impaired Financing Receivable, Related Allowance 20,930 26,540  
Loans and Leases:      
Ending balance of loans individually evaluated for impairment 21,542 20,460  
Ending balance of loans collectively evaluated for impairment 2,468,549 2,407,117  
Loans and Leases Receivable, Net of Deferred Income 2,490,091 2,427,577  
Residential real estate      
Allowance for loan and lease losses:      
Balance at beginning of year 3,208 4,014 3,753
Provision for loan and lease losses 1,695 (655) 1,234
Loans charged-off 435 387 1,531
Recoveries 215 236 558
Total net charge-offs (220) (151) (973)
Balance at end of year 4,683 3,208 4,014
Ending allowance on loans individually evaluated for impairment 160 179  
Ending allowance on loans collectively evaluated for impairment 4,523 3,029  
Impaired Financing Receivable, Related Allowance 4,683 3,208  
Loans and Leases:      
Ending balance of loans individually evaluated for impairment 7,932 9,601  
Ending balance of loans collectively evaluated for impairment 463,459 491,379  
Loans and Leases Receivable, Net of Deferred Income 471,391 500,980  
Home equity      
Allowance for loan and lease losses:      
Balance at beginning of year 3,043 3,943 4,260
Provision for loan and lease losses 1,778 (175) 573
Loans charged-off 913 1,445 1,891
Recoveries 1,027 720 1,001
Total net charge-offs 114 (725) (890)
Balance at end of year 4,935 3,043 3,943
Ending allowance on loans individually evaluated for impairment 2 2  
Ending allowance on loans collectively evaluated for impairment 4,933 3,041  
Impaired Financing Receivable, Related Allowance 4,935 3,043  
Loans and Leases:      
Ending balance of loans individually evaluated for impairment 4,456 4,074  
Ending balance of loans collectively evaluated for impairment 489,148 456,314  
Loans and Leases Receivable, Net of Deferred Income 493,604 460,388  
Installment      
Allowance for loan and lease losses:      
Balance at beginning of year 388 386 407
Provision for loan and lease losses (90) 53 25
Loans charged-off 225 386 509
Recoveries 234 335 463
Total net charge-offs 9 (51) (46)
Balance at end of year 307 388 386
Ending allowance on loans individually evaluated for impairment 0 0  
Ending allowance on loans collectively evaluated for impairment 307 388  
Impaired Financing Receivable, Related Allowance 307 388  
Loans and Leases:      
Ending balance of loans individually evaluated for impairment 255 437  
Ending balance of loans collectively evaluated for impairment 41,331 50,202  
Loans and Leases Receivable, Net of Deferred Income 41,586 50,639  
Credit card      
Allowance for loan and lease losses:      
Balance at beginning of year 1,559 1,773 2,002
Provision for loan and lease losses 408 673 580
Loans charged-off 857 1,190 1,049
Recoveries 206 303 240
Total net charge-offs (651) (887) (809)
Balance at end of year 1,316 1,559 $ 1,773
Ending allowance on loans individually evaluated for impairment 0 0  
Ending allowance on loans collectively evaluated for impairment 1,316 1,559  
Impaired Financing Receivable, Related Allowance 1,316 1,559  
Loans and Leases:      
Ending balance of loans individually evaluated for impairment 0 0  
Ending balance of loans collectively evaluated for impairment 46,691 43,408  
Loans and Leases Receivable, Net of Deferred Income $ 46,691 $ 43,408