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SHORT-TERM BORROWINGS (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
SHORT-TERM BORROWINGS |  |  |
Maximum borrowing capacity | $ 1,502,812,000 |  |
Amount outstanding at December 31 | 32,000,000 | $ 135,000,000 | $ 69,000,000
Interest expense on short-term borrowings | 183,000 | 578,000 | 254,000
Average amount outstanding during year | 15,531,000 | 110,928,000 | 92,045,000
Highest month-end balance during year | $ 69,000,000 | $ 226,000,000 | $ 157,000,000
Weighted average interest rate on balances outstanding at December 31 | 1.63% | 0.74% | 0.35%
Weighted average interest rate during year | 1.18% | 0.52% | 0.28%
Federal Reserve discount window line of credit | Central Bank |  |  |
SHORT-TERM BORROWINGS |  |  |
Additional unused borrowings available | $ 73,000,000 | $ 63,700,000 |
Commercial real estate and commercial loans pledged as collateral | 129,200,000 | $ 129,900,000 |
FHLB line of credit |  |  |
SHORT-TERM BORROWINGS |  |  |
Additional unused borrowings available | 1,470,000,000 |  |
Commercial real estate and commercial loans pledged as collateral | $ 2,020,000,000 |  |

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- Definition The aggregate interest expense incurred on short-term borrowings including commercial paper and Federal funds purchased and securities sold under agreements to repurchase. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 225 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04.7) -URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882 + Details
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- Definition Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b),22(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The sum of the carrying amounts, as of the date of the latest financial statement presented, of loans receivable which are owned but transferred to serve as collateral for the payment of related debt obligations, primarily secured borrowings and repurchase agreements, and for which the transferees are not permitted to sell or re-pledge them to an unrelated party. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 860 -SubTopic 30 -Section 50 -Paragraph 1A -Subparagraph (b)(1)(i) -URI http://asc.fasb.org/extlink&oid=64858031&loc=SL6224234-111729 + Details
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- Definition Weighted average interest rate of short-term debt outstanding calculated at point in time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19(b)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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