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Commitments and contingencies | 6 Months Ended
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Jun. 30, 2018
Other Commitments [Line Items] |
Commitments and Contingencies Disclosure [Text Block] | COMMITMENTS AND CONTINGENCIES Financial Instruments with Off-Balance Sheet Risk In the normal course of business, the Company enters into various transactions to meet the financing needs of its customers, which, in accordance with GAAP, are not included in its consolidated balance sheets. These transactions include commitments to extend credit and standby letters of credit, which involve, to varying degrees, elements of credit risk and interest rate risk in excess of the amounts recognized in the consolidated balance sheets. The Company minimizes its exposure to loss under these commitments by subjecting them to credit approval and monitoring procedures. The Company enters into contractual commitments to extend credit, normally with fixed expiration dates or termination clauses, at specified rates and for specific purposes. Substantially all of these commitments to extend credit are contingent upon customers maintaining specific credit standards at the time of loan funding. Standby letters of credit are written conditional commitments issued to guarantee the performance of a customer to a third party. In the event the customer does not perform in accordance with the terms of the agreement with the third party, the Company would be required to fund the commitment. The maximum potential amount of future payments the Company could be required to make is represented by the contractual amount of the commitment. If the commitment were funded, the Company would be entitled to seek recovery from the customer. The Company’s policies generally require that standby letter of credit arrangements contain security and debt covenants similar to those contained in loan agreements. The fees collected in connection with the issuance of standby letters of credit are representative of the fair value of the Company's obligation undertaken in issuing the guarantee. In accordance with applicable accounting standards related to guarantees, fees collected in connection with the issuance of standby letters of credit are deferred. The fees are then recognized in income proportionately over the life of the standby letter of credit agreement. The deferred standby letter of credit fees represent the fair value of the Company's potential obligations under the standby letter of credit guarantees. The following table summarizes the above financial instruments at the dates indicated:
| June 30, 2018 |  | December 31, 2017
| (Dollars in thousands)
Commitments to extend credit | $ | 2,536,434 |  |  | $ | 2,443,478 |
Standby letters of credit | 16,132 |  |  | 15,534 |
Deferred standby letter of credit fees | 115 |  |  | 102 |
Lease Commitments The Company leases office space, space for ATM locations, and certain branch locations under noncancelable operating leases. Several of these leases have renewal options that typically range from 5 to 10 years. Rent expense incurred under operating leases was approximately $2.3 million and $2.1 million for the three months ended June 30, 2018 and 2017, respectively, and $4.8 million and $4.2 million for the six months ended June 30, 2018 and 2017, respectively. There has been no significant change in the future minimum lease payments payable by the Company since December 31, 2017. See the Company's Annual Report on Form 10-K for the fiscal year ended December 31, 2017 for information regarding leases and other commitments. Other Contingencies At June 30, 2018, Rockland Trust was involved in pending lawsuits that arose in the ordinary course of business. Management has reviewed these pending lawsuits with legal counsel and has taken into consideration the view of counsel as to their outcome. In the opinion of management, the final disposition of pending lawsuits is not expected to have a material adverse effect on the Company’s financial position or results of operations. The Bank is required to maintain certain reserve requirements of vault cash and/or deposits with the Federal Reserve Bank of Boston. The reserve requirement was $35.4 million and $35.8 million at June 30, 2018 and December 31, 2017, respectively.

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- Definition The entire disclosure for commitments and contingencies. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -URI http://asc.fasb.org/topic&trid=2127136 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 440 -URI http://asc.fasb.org/topic&trid=2144648 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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