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SEGMENT INFORMATION (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
segment
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Segment Reporting [Abstract]                      
Number of reportable segments | segment                 3    
SEGMENT INFORMATION                      
Net interest income (expense) $ 42,824 $ 41,995 $ 41,629 $ 41,255 $ 39,704 $ 39,426 $ 39,609 $ 39,211 $ 167,703 $ 157,950 $ 149,528
Credit (provision) for loan and lease losses 186 126 2,282 80 2,645 743 1,382 747 2,674 5,517 15,671
Other operating income                 36,496 42,316 34,799
Other operating expense                 (131,817) (133,563) (127,042)
Administrative and overhead expense allocation                 0 0 0
Income taxes                 (33,852) (25,228) (27,088)
Net income 4,288 $ 11,812 $ 12,025 $ 13,079 12,208 $ 11,466 $ 12,137 $ 11,181 41,204 46,992 45,868
Investment securities 1,496,644       1,461,515       1,496,644 1,461,515  
Loans and leases (including loans held for sale) 3,786,951       3,556,771       3,786,951 3,556,771  
Other 340,113       365,950       340,113 365,950  
Total assets 5,623,708       5,384,236       5,623,708 5,384,236  
Banking Operations                      
SEGMENT INFORMATION                      
Net interest income (expense)                 140,077 128,673 115,936
Credit (provision) for loan and lease losses                 2,674 5,517 15,671
Other operating income                 22,511 25,994 23,447
Other operating expense                 (60,939) (58,856) (59,273)
Administrative and overhead expense allocation                 (61,082) (64,139) (59,266)
Income taxes                 (34,376) (25,796) (28,070)
Net income                 41,842 48,048 52,131
Investment securities 0       0       0 0  
Loans and leases (including loans held for sale) 3,786,951       3,556,771       3,786,951 3,556,771  
Other 42,243       56,482       42,243 56,482  
Total assets 3,829,194       3,613,253       3,829,194 3,613,253  
Treasury                      
SEGMENT INFORMATION                      
Net interest income (expense)                 27,626 29,277 33,592
Credit (provision) for loan and lease losses                 0 0 0
Other operating income                 2,448 3,148 967
Other operating expense                 (1,433) (1,616) (1,859)
Administrative and overhead expense allocation                 (972) (918) (1,042)
Income taxes                 (1,204) (1,143) (29)
Net income                 1,465 2,130 53
Investment securities 1,496,644       1,461,515       1,496,644 1,461,515  
Loans and leases (including loans held for sale) 0       0       0 0  
Other 228,608       241,387       228,608 241,387  
Total assets 1,725,252       1,702,902       1,725,252 1,702,902  
All Others                      
SEGMENT INFORMATION                      
Net interest income (expense)                 0 0 0
Credit (provision) for loan and lease losses                 0 0 0
Other operating income                 11,537 13,174 10,385
Other operating expense                 (69,445) (73,091) (65,910)
Administrative and overhead expense allocation                 62,054 65,057 60,308
Income taxes                 1,728 1,711 1,011
Net income                 (2,103) (3,186) (6,316)
Investment securities 0       0       0 0  
Loans and leases (including loans held for sale) 0       0       0 0  
Other 69,262       68,081       69,262 68,081  
Total assets $ 69,262       $ 68,081       69,262 68,081  
Intersegment elimination                      
SEGMENT INFORMATION                      
Net interest income (expense)                 0 0 0
Intersegment elimination | Banking Operations                      
SEGMENT INFORMATION                      
Net interest income (expense)                 32,977 36,655 43,686
Intersegment elimination | Treasury                      
SEGMENT INFORMATION                      
Net interest income (expense)                 (25,000) (26,618) (31,576)
Intersegment elimination | All Others                      
SEGMENT INFORMATION                      
Net interest income (expense)                 $ (7,977) $ (10,037) $ (12,110)