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SEGMENT INFORMATION (Details)
$ in Thousands
 3 Months Ended
Mar. 31, 2018
USD ($)
segment
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Segment Reporting [Abstract]      
Number of reportable segments | segment 3    
SEGMENT INFORMATION      
Net interest income (expense) $ 42,322 $ 41,255  
Other operating income 8,954 10,014  
Other operating expense (33,518) (31,460)  
Income before income taxes 17,969 19,889  
Income tax (expenses) benefit (3,692) (6,810)  
Net income 14,277 13,079  
Investment securities 1,503,923   $ 1,496,644
Total assets 5,651,287   5,623,708
Banking Operations      
SEGMENT INFORMATION      
Net income 14,236 12,559  
Total assets 3,865,065   3,829,194
Treasury      
SEGMENT INFORMATION      
Net income 504 1,082  
Total assets 1,713,965   1,725,252
All Others      
SEGMENT INFORMATION      
Net income (463) (562)  
Total assets 72,257   69,262
Intersegment elimination      
SEGMENT INFORMATION      
Net interest income (expense) 0 0  
Intersegment elimination | Banking Operations      
SEGMENT INFORMATION      
Net interest income (expense) 6,921 7,927  
Intersegment elimination | Treasury      
SEGMENT INFORMATION      
Net interest income (expense) (5,449) (6,190)  
Intersegment elimination | All Others      
SEGMENT INFORMATION      
Net interest income (expense) (1,472) (1,737)  
Operating segments      
SEGMENT INFORMATION      
Net interest income (expense) 42,322 41,255  
Provision (credit) for loan and lease losses 211 80  
Other operating income 8,954 10,014  
Other operating expense (33,518) (31,460)  
Administrative and overhead expense allocation 0 0  
Income before income taxes 17,969 19,889  
Income tax (expenses) benefit (3,692) (6,810)  
Investment securities 1,503,923   1,496,644
Loans and leases (including loans held for sale) 3,823,638   3,786,951
Other 323,726   340,113
Operating segments | Banking Operations      
SEGMENT INFORMATION      
Net interest income (expense) 36,142 34,090  
Provision (credit) for loan and lease losses 211 80  
Other operating income 5,514 5,724  
Other operating expense (15,925) (15,018)  
Administrative and overhead expense allocation (14,946) (13,704)  
Income before income taxes 17,917 19,099  
Income tax (expenses) benefit (3,681) (6,540)  
Investment securities 0   0
Loans and leases (including loans held for sale) 3,823,638   3,786,951
Other 41,427   42,243
Operating segments | Treasury      
SEGMENT INFORMATION      
Net interest income (expense) 6,180 7,165  
Provision (credit) for loan and lease losses 0 0  
Other operating income 511 1,261  
Other operating expense (385) (388)  
Administrative and overhead expense allocation (223) (202)  
Income before income taxes 634 1,646  
Income tax (expenses) benefit (130) (564)  
Investment securities 1,503,923   1,496,644
Loans and leases (including loans held for sale) 0   0
Other 210,042   228,608
Operating segments | All Others      
SEGMENT INFORMATION      
Net interest income (expense) 0 0  
Provision (credit) for loan and lease losses 0 0  
Other operating income 2,929 3,029  
Other operating expense (17,208) (16,054)  
Administrative and overhead expense allocation 15,169 13,906  
Income before income taxes (582) (856)  
Income tax (expenses) benefit 119 294  
Investment securities 0   0
Loans and leases (including loans held for sale) 0   0
Other 72,257   $ 69,262
Mortgage banking income | Operating segments      
SEGMENT INFORMATION      
Other operating income 1,847 1,943  
Mortgage banking income | Operating segments | Banking Operations      
SEGMENT INFORMATION      
Other operating income 993 1,120  
Mortgage banking income | Operating segments | Treasury      
SEGMENT INFORMATION      
Other operating income 0 0  
Mortgage banking income | Operating segments | All Others      
SEGMENT INFORMATION      
Other operating income 854 823  
Service charges on deposit accounts | Operating segments      
SEGMENT INFORMATION      
Other operating income 2,003 2,036  
Service charges on deposit accounts | Operating segments | Banking Operations      
SEGMENT INFORMATION      
Other operating income 2,003 2,035  
Service charges on deposit accounts | Operating segments | Treasury      
SEGMENT INFORMATION      
Other operating income 0 1  
Service charges on deposit accounts | Operating segments | All Others      
SEGMENT INFORMATION      
Other operating income 0 0  
Other service charges and fees | Operating segments      
SEGMENT INFORMATION      
Other operating income 3,034 2,748  
Other service charges and fees | Operating segments | Banking Operations      
SEGMENT INFORMATION      
Other operating income 1,143 838  
Other service charges and fees | Operating segments | Treasury      
SEGMENT INFORMATION      
Other operating income 6 0  
Other service charges and fees | Operating segments | All Others      
SEGMENT INFORMATION      
Other operating income 1,885 1,910  
Income from fiduciary activities | Operating segments      
SEGMENT INFORMATION      
Other operating income 956 864  
Income from fiduciary activities | Operating segments | Banking Operations      
SEGMENT INFORMATION      
Other operating income 956 864  
Income from fiduciary activities | Operating segments | Treasury      
SEGMENT INFORMATION      
Other operating income 0 0  
Income from fiduciary activities | Operating segments | All Others      
SEGMENT INFORMATION      
Other operating income 0 0  
Equity in earnings of unconsolidated subsidiaries | Operating segments      
SEGMENT INFORMATION      
Other operating income 43 61  
Equity in earnings of unconsolidated subsidiaries | Operating segments | Banking Operations      
SEGMENT INFORMATION      
Other operating income 43 61  
Equity in earnings of unconsolidated subsidiaries | Operating segments | Treasury      
SEGMENT INFORMATION      
Other operating income 0 0  
Equity in earnings of unconsolidated subsidiaries | Operating segments | All Others      
SEGMENT INFORMATION      
Other operating income 0 0  
Fees on foreign exchange | Operating segments      
SEGMENT INFORMATION      
Other operating income 211 163  
Fees on foreign exchange | Operating segments | Banking Operations      
SEGMENT INFORMATION      
Other operating income 24 18  
Fees on foreign exchange | Operating segments | Treasury      
SEGMENT INFORMATION      
Other operating income 187 129  
Fees on foreign exchange | Operating segments | All Others      
SEGMENT INFORMATION      
Other operating income 0 16  
Income from bank-owned life insurance | Operating segments      
SEGMENT INFORMATION      
Other operating income 318 1,117  
Income from bank-owned life insurance | Operating segments | Banking Operations      
SEGMENT INFORMATION      
Other operating income 0 0  
Income from bank-owned life insurance | Operating segments | Treasury      
SEGMENT INFORMATION      
Other operating income 318 1,117  
Income from bank-owned life insurance | Operating segments | All Others      
SEGMENT INFORMATION      
Other operating income 0 0  
Loan placement fees | Operating segments      
SEGMENT INFORMATION      
Other operating income 197 134  
Loan placement fees | Operating segments | Banking Operations      
SEGMENT INFORMATION      
Other operating income 197 134  
Loan placement fees | Operating segments | Treasury      
SEGMENT INFORMATION      
Other operating income 0 0  
Loan placement fees | Operating segments | All Others      
SEGMENT INFORMATION      
Other operating income 0 0  
Net gain (loss) sale of foreclosed assets | Operating segments      
SEGMENT INFORMATION      
Other operating income   102  
Net gain (loss) sale of foreclosed assets | Operating segments | Banking Operations      
SEGMENT INFORMATION      
Other operating income   0  
Net gain (loss) sale of foreclosed assets | Operating segments | Treasury      
SEGMENT INFORMATION      
Other operating income   0  
Net gain (loss) sale of foreclosed assets | Operating segments | All Others      
SEGMENT INFORMATION      
Other operating income   102  
Other income | Operating segments      
SEGMENT INFORMATION      
Other operating income 345 846  
Other income | Operating segments | Banking Operations      
SEGMENT INFORMATION      
Other operating income 155 654  
Other income | Operating segments | Treasury      
SEGMENT INFORMATION      
Other operating income 0 14  
Other income | Operating segments | All Others      
SEGMENT INFORMATION      
Other operating income $ 190 $ 178