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Off-Balance Sheet Transactions and Guarantees | 12 Months Ended
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Dec. 31, 2017
Off-Balance Sheet Transactions and Guarantees [Abstract] |
Off-Balance Sheet Transactions and Guarantees | 18. Off-Balance Sheet Transactions and Guarantees CTBI is a party to transactions with off-balance sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments include standby letters of credit and commitments to extend credit in the form of unused lines of credit. CTBI uses the same credit policies in making commitments and conditional obligations as it does for on-balance sheet instruments. At December 31, CTBI had the following off-balance sheet financial instruments, whose approximate contract amounts represent additional credit risk to CTBI:
(in thousands) |  | 2017 |  |  | 2016 |
Standby letters of credit |  | $ | 29,308 |  |  | $ | 29,917 |
Commitments to extend credit |  |  | 516,731 |  |  |  | 570,467 |
Total off-balance sheet financial instruments |  | $ | 546,039 |  |  | $ | 600,384 |
Standby letters of credit represent conditional commitments to guarantee the performance of a third party. The credit risk involved is essentially the same as the risk involved in making loans. At December 31, 2017, we maintained a credit loss reserve recorded in other liabilities of approximately $7 thousand relating to these financial standby letters of credit. The reserve coverage calculation was determined using essentially the same methodology as used for the allowance for loan and lease losses. Approximately 64% of the total standby letters of credit are secured, with $15.3 million of the total $29.3 million secured by cash. Collateral for the remaining secured standby letters of credit varies but is comprised primarily of accounts receivable, inventory, property, equipment, and income-producing properties. Commitments to extend credit are agreements to originate loans to customers as long as there is no violation of any condition of the contract. At December 31, 2017, a credit loss reserve recorded in other liabilities of $248 thousand was maintained relating to these commitments. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Since a portion of the commitments may expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. Each customer’s creditworthiness is evaluated on a case-by-case basis. The amount of collateral obtained, if deemed necessary, is based on management’s credit evaluation of the counterparty. Collateral held varies, but may include accounts receivable, inventory, property, plant and equipment, commercial real estate, and residential real estate. A portion of the commitments is to extend credit at fixed rates. Fixed rate loan commitments at December 31, 2017 of $52.2 million had interest rates ranging predominantly from 3.00% to 5.00%, respectively, and terms predominantly two years or less. These credit commitments were based on prevailing rates, terms, and conditions applicable to other loans being made at December 31, 2017. Included in our commitments to extend credit are mortgage loans in the process of origination which are intended for sale to investors in the secondary market. These forward sale commitments are on an individual loan basis that CTBI originates as part of its mortgage banking activities. CTBI commits to sell the loans at specified prices in a future period, typically within 60 days. These commitments are acquired to reduce market risk on mortgage loans in the process of origination and mortgage loans held for sale since CTBI is exposed to interest rate risk during the period between issuing a loan commitment and the sale of the loan into the secondary market. Total mortgage loans in the process of origination amounted to $2.5 million and $2.9 million at December 31, 2017 and 2016, respectively, and mortgage loans held for sale amounted to $1.0 million and $1.2 million for the years ended December 31, 2017 and 2016, respectively.

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