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DERIVATIVES (Tables) | 12 Months Ended
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Dec. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Summary of Derivative Financial Instruments and Balances | The following table details the location and amounts recognized in the Consolidated Balance Sheets for client derivatives:
|  |  |  | December 31, 2018 |  | December 31, 2017
|  |  |  |  |  | Estimated fair value |  |  |  | Estimated fair value
(Dollars in thousands) |  | Balance Sheet Classification |  | Notional amount |  | Gain |  | Loss |  | Notional amount |  | Gain |  | Loss
Client derivatives |  |  |  |  |  |  |  |  |  |  |  |  |  |
Matched interest rate swaps with borrower |  | Accrued interest and other assets and other liabilities |  | $ | 1,359,990 |  |  | $ | 17,402 |  |  | $ | (11,787 | ) |  | $ | 837,040 |  |  | $ | 7,153 |  |  | $ | (5,529 | )
Matched interest rate swaps with counterparty |  | Accrued interest and other liabilities |  | 1,359,990 |  |  | 11,787 |  |  | (17,401 | ) |  | 837,040 |  |  | 5,529 |  |  | (7,158 | )
Total |  |  |  | $ | 2,719,980 |  |  | $ | 29,189 |  |  | $ | (29,188 | ) |  | $ | 1,674,080 |  |  | $ | 12,682 |  |  | $ | (12,687 | )
Disclosure by Type of Financial Instrument [Table Text Block] | The following table discloses the gross and net amounts of client derivative liabilities recognized in the Consolidated Balance Sheets:
|  | December 31, 2018 |  | December 31, 2017
(Dollars in thousands) |  | Gross amounts of recognized liabilities |  | Gross amounts offset in the Consolidated Balance Sheets |  | Net amounts of liabilities presented in the Consolidated Balance Sheets |  | Gross amounts of recognized liabilities |  | Gross amounts offset in the Consolidated Balance Sheets |  | Net amounts of liabilities presented in the Consolidated Balance Sheets
Client derivatives |  |  |  |  |  |  |  |  |  |  |  |
Matched interest rate swaps |  | $ | 29,189 |  |  | $ | (14,577 | ) |  | $ | 14,612 |  |  | $ | 12,687 |  |  | $ | 2,279 |  |  | $ | 14,966 |
Derivative Financial Instruments, Average Remaining Maturity and the Weighted-Average Interest Rates being Paid and Received | The following table details the derivative financial instruments, the average remaining maturities and the weighted-average interest rates being paid and received by First Financial at December 31, 2018:
|  |  |  |  |  |  |  | Weighted-Average Rate
(Dollars in thousands) |  | Notional amount |  | Average maturity (years) |  | Fair value |  | Receive |  | Pay
Client derivatives |  |  |  |  |  |  |  |  |  |
Receive fixed, matched interest rate swaps with borrower |  | $ | 1,359,990 |  |  | 6.2 |  | $ | 5,615 |  |  | 4.70 | % |  | 4.67 | %
Pay fixed, matched interest rate swaps with counterparty |  | 1,359,990 |  |  | 6.2 |  | (5,614 | ) |  | 4.67 | % |  | 4.70 | %
Total client derivatives |  | $ | 2,719,980 |  |  | 6.2 |  | $ | 1 |  |  | 4.68 | % |  | 4.68 | %

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- Definition Tabular disclosure of the location and fair value amounts of derivative instruments (and nonderivative instruments that are designated and qualify as hedging instruments) reported in the statement of financial position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 + Details
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- Definition Tabular disclosure of pertinent information about a derivative or group of derivatives on a disaggregated basis, such as for individual instruments, or small groups of similar instruments. May include a combination of the type of instrument, risks being hedged, notional amount, hedge designation, related hedged item, inception date, maturity date, or other relevant item. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624163-113959 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41620-113959 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41638-113959 Reference 6: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41678-113959 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=109980867&loc=d3e41641-113959 Reference 8: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 Reference 9: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(n)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 10: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579240-113959 + Details
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