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SEGMENT INFORMATION (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2018 USD ($) | Mar. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2017 USD ($) | Jun. 30, 2017 USD ($) | Mar. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) segment | Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($)
Segment Reporting [Abstract] |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments | segment |  |  |  |  |  |  |  |  | 3 |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Net interest income (expense) | $ 44,679 | $ 43,325 | $ 42,672 | $ 42,322 | $ 42,824 | $ 41,995 | $ 41,629 | $ 41,255 | $ 172,998 | $ 167,703 | $ 157,950
Credit (provision) for loan and lease losses | 1,386 | 59 | (532) | 211 | 186 | 126 | 2,282 | 80 | 1,124 | 2,674 | 5,517
Other operating income |  |  |  |  |  |  |  |  | 38,804 | 36,496 | 42,316
Other operating expense |  |  |  |  |  |  |  |  | (134,682) | (131,073) | (132,518)
Administrative and overhead expense allocation |  |  |  |  |  |  |  |  | 0 | 0 | 0
Income before income taxes | 21,823 | 20,179 | 18,159 | 18,083 | 17,656 | 18,353 | 19,669 | 20,122 | 78,244 | 75,800 | 73,265
Income taxes |  |  |  |  |  |  |  |  | (18,758) | (34,596) | (26,273)
Net income | 15,792 | $ 15,193 | $ 14,224 | $ 14,277 | 4,288 | $ 11,812 | $ 12,025 | $ 13,079 | 59,486 | 41,204 | 46,992
Investment securities | 1,354,812 |  |  |  | 1,496,644 |  |  |  | 1,354,812 | 1,496,644 |
Loans and leases (including loans held for sale) | 4,085,013 |  |  |  | 3,786,951 |  |  |  | 4,085,013 | 3,786,951 |
Other | 367,201 |  |  |  | 340,113 |  |  |  | 367,201 | 340,113 |
Total assets | 5,807,026 |  |  |  | 5,623,708 |  |  |  | 5,807,026 | 5,623,708 |
Banking Operations |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Net interest income (expense) |  |  |  |  |  |  |  |  | 153,314 | 140,077 | 128,673
Credit (provision) for loan and lease losses |  |  |  |  |  |  |  |  | 1,124 | 2,674 | 5,517
Other operating income |  |  |  |  |  |  |  |  | 23,879 | 22,511 | 25,994
Other operating expense |  |  |  |  |  |  |  |  | (63,649) | (60,939) | (58,856)
Administrative and overhead expense allocation |  |  |  |  |  |  |  |  | (60,636) | (61,082) | (64,139)
Income taxes |  |  |  |  |  |  |  |  | (19,832) | (34,376) | (25,796)
Net income |  |  |  |  |  |  |  |  | 62,891 | 41,842 | 48,048
Investment securities | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Loans and leases (including loans held for sale) | 4,085,013 |  |  |  | 3,786,951 |  |  |  | 4,085,013 | 3,786,951 |
Other | 36,905 |  |  |  | 42,243 |  |  |  | 36,905 | 42,243 |
Total assets | 4,121,918 |  |  |  | 3,829,194 |  |  |  | 4,121,918 | 3,829,194 |
Treasury |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Net interest income (expense) |  |  |  |  |  |  |  |  | 19,684 | 27,626 | 29,277
Credit (provision) for loan and lease losses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other operating income |  |  |  |  |  |  |  |  | 2,733 | 2,448 | 3,148
Other operating expense |  |  |  |  |  |  |  |  | (1,472) | (1,433) | (1,616)
Administrative and overhead expense allocation |  |  |  |  |  |  |  |  | (874) | (972) | (918)
Income taxes |  |  |  |  |  |  |  |  | (428) | (1,204) | (1,143)
Net income |  |  |  |  |  |  |  |  | 1,359 | 1,465 | 2,130
Investment securities | 1,354,812 |  |  |  | 1,496,644 |  |  |  | 1,354,812 | 1,496,644 |
Loans and leases (including loans held for sale) | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Other | 256,652 |  |  |  | 228,608 |  |  |  | 256,652 | 228,608 |
Total assets | 1,611,464 |  |  |  | 1,725,252 |  |  |  | 1,611,464 | 1,725,252 |
All Others |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Net interest income (expense) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Credit (provision) for loan and lease losses |  |  |  |  |  |  |  |  | 0 | 0 | 0
Other operating income |  |  |  |  |  |  |  |  | 12,192 | 11,537 | 13,174
Other operating expense |  |  |  |  |  |  |  |  | (69,561) | (68,701) | (72,046)
Administrative and overhead expense allocation |  |  |  |  |  |  |  |  | 61,510 | 62,054 | 65,057
Income taxes |  |  |  |  |  |  |  |  | 1,502 | 984 | 666
Net income |  |  |  |  |  |  |  |  | (4,764) | (2,103) | (3,186)
Investment securities | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Loans and leases (including loans held for sale) | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Other | 73,644 |  |  |  | 69,262 |  |  |  | 73,644 | 69,262 |
Total assets | $ 73,644 |  |  |  | $ 69,262 |  |  |  | 73,644 | 69,262 |
Intersegment elimination |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Net interest income (expense) |  |  |  |  |  |  |  |  | 0 | 0 | 0
Intersegment elimination | Banking Operations |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Net interest income (expense) |  |  |  |  |  |  |  |  | 28,691 | 32,977 | 36,655
Intersegment elimination | Treasury |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Net interest income (expense) |  |  |  |  |  |  |  |  | (18,284) | (25,000) | (26,618)
Intersegment elimination | All Others |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Net interest income (expense) |  |  |  |  |  |  |  |  | (10,407) | (7,977) | (10,037)
Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | 78,244 | 75,800 | 73,265
Operating Segments [Member] | Banking Operations |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | 82,723 | 76,218 | 73,844
Operating Segments [Member] | Treasury |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | 1,787 | 2,669 | 3,273
Operating Segments [Member] | All Others |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Income before income taxes |  |  |  |  |  |  |  |  | (6,266) | $ (3,087) | $ (3,852)
Service charges on deposit accounts | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Other operating income |  |  |  |  |  |  |  |  | 8,406 |  |
Service charges on deposit accounts | Operating Segments [Member] | Banking Operations |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Other operating income |  |  |  |  |  |  |  |  | 8,406 |  |
Service charges on deposit accounts | Operating Segments [Member] | Treasury |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Other operating income |  |  |  |  |  |  |  |  | 0 |  |
Service charges on deposit accounts | Operating Segments [Member] | All Others |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Other operating income |  |  |  |  |  |  |  |  | 0 |  |
Other service charges and fees | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Other operating income |  |  |  |  |  |  |  |  | 13,123 |  |
Other service charges and fees | Operating Segments [Member] | Banking Operations |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Other operating income |  |  |  |  |  |  |  |  | 5,154 |  |
Other service charges and fees | Operating Segments [Member] | Treasury |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Other operating income |  |  |  |  |  |  |  |  | 23 |  |
Other service charges and fees | Operating Segments [Member] | All Others |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Other operating income |  |  |  |  |  |  |  |  | 7,946 |  |
Income from fiduciary activities | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Other operating income |  |  |  |  |  |  |  |  | 4,245 |  |
Income from fiduciary activities | Operating Segments [Member] | Banking Operations |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Other operating income |  |  |  |  |  |  |  |  | 4,245 |  |
Income from fiduciary activities | Operating Segments [Member] | Treasury |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Other operating income |  |  |  |  |  |  |  |  | 0 |  |
Income from fiduciary activities | Operating Segments [Member] | All Others |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Other operating income |  |  |  |  |  |  |  |  | 0 |  |
Equity in Earnings of Unconsolidated Subsidiaries [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Other operating income |  |  |  |  |  |  |  |  | 233 |  |
Equity in Earnings of Unconsolidated Subsidiaries [Member] | Operating Segments [Member] | Banking Operations |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Other operating income |  |  |  |  |  |  |  |  | 233 |  |
Equity in Earnings of Unconsolidated Subsidiaries [Member] | Operating Segments [Member] | Treasury |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Other operating income |  |  |  |  |  |  |  |  | 0 |  |
Equity in Earnings of Unconsolidated Subsidiaries [Member] | Operating Segments [Member] | All Others |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Other operating income |  |  |  |  |  |  |  |  | 0 |  |
Fees on foreign exchange | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Other operating income |  |  |  |  |  |  |  |  | 905 |  |
Fees on foreign exchange | Operating Segments [Member] | Banking Operations |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Other operating income |  |  |  |  |  |  |  |  | 98 |  |
Fees on foreign exchange | Operating Segments [Member] | Treasury |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Other operating income |  |  |  |  |  |  |  |  | 807 |  |
Fees on foreign exchange | Operating Segments [Member] | All Others |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Other operating income |  |  |  |  |  |  |  |  | 0 |  |
Investment Securities Gains (Losses) [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Other operating income |  |  |  |  |  |  |  |  | (279) |  |
Investment Securities Gains (Losses) [Member] | Operating Segments [Member] | Banking Operations |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Other operating income |  |  |  |  |  |  |  |  | 0 |  |
Investment Securities Gains (Losses) [Member] | Operating Segments [Member] | Treasury |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Other operating income |  |  |  |  |  |  |  |  | (279) |  |
Investment Securities Gains (Losses) [Member] | Operating Segments [Member] | All Others |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Other operating income |  |  |  |  |  |  |  |  | 0 |  |
Income from Bank-owned Life Insurance [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Other operating income |  |  |  |  |  |  |  |  | 2,117 |  |
Income from Bank-owned Life Insurance [Member] | Operating Segments [Member] | Banking Operations |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Other operating income |  |  |  |  |  |  |  |  | 0 |  |
Income from Bank-owned Life Insurance [Member] | Operating Segments [Member] | Treasury |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Other operating income |  |  |  |  |  |  |  |  | 2,117 |  |
Income from Bank-owned Life Insurance [Member] | Operating Segments [Member] | All Others |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Other operating income |  |  |  |  |  |  |  |  | 0 |  |
Loan placement fees | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Other operating income |  |  |  |  |  |  |  |  | 747 |  |
Loan placement fees | Operating Segments [Member] | Banking Operations |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Other operating income |  |  |  |  |  |  |  |  | 747 |  |
Loan placement fees | Operating Segments [Member] | Treasury |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Other operating income |  |  |  |  |  |  |  |  | 0 |  |
Loan placement fees | Operating Segments [Member] | All Others |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Other operating income |  |  |  |  |  |  |  |  | 0 |  |
Other [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Other operating income |  |  |  |  |  |  |  |  | 1,992 |  |
Other [Member] | Operating Segments [Member] | Banking Operations |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Other operating income |  |  |  |  |  |  |  |  | 981 |  |
Other [Member] | Operating Segments [Member] | Treasury |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Other operating income |  |  |  |  |  |  |  |  | 65 |  |
Other [Member] | Operating Segments [Member] | All Others |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Other operating income |  |  |  |  |  |  |  |  | 946 |  |
Mortgage Banking Income [Member] | Operating Segments [Member] |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Other operating income |  |  |  |  |  |  |  |  | 7,315 |  |
Mortgage Banking Income [Member] | Operating Segments [Member] | Banking Operations |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Other operating income |  |  |  |  |  |  |  |  | 4,015 |  |
Mortgage Banking Income [Member] | Operating Segments [Member] | Treasury |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Other operating income |  |  |  |  |  |  |  |  | 0 |  |
Mortgage Banking Income [Member] | Operating Segments [Member] | All Others |  |  |  |  |  |  |  |  |  |  |
SEGMENT INFORMATION |  |  |  |  |  |  |  |  |  |  |
Other operating income |  |  |  |  |  |  |  |  | $ 3,300 |  |

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