REVENUE FROM CONTRACTS WITH CUSTOMERS

Disaggregation of Revenue:

Deposit fees and other service charges for the years ended December 31, 2018, 2017 and 2016 are summarized as follows (in thousands):



	Years Ended December 31
	2018		2017		2016
Deposit service charges	18,089		16,725		16,863
Debit and credit interchange fees	31,713		28,358		22,578
Debit and credit card expense	(8,511	)	(7,390	)	(3,078	)
Merchant services income	10,226		10,159		9,052
Merchant services expenses	(7,767	)	(8,335	)	(7,245	)
Other service charges	4,324		3,935		3,741
Total deposit fees and other service charges	48,074		43,452		41,911

Deposit fees and other service charges

Deposit fees and other service charges include transaction and non-transaction based deposit fees. Transaction based fees on deposit accounts are charged to deposit customers for specific services provided to the customer. These fees include such items as wire fees, official check fees, and overdraft fees. These are contract specific to each individual transaction and do not extend beyond the individual transaction. The performance obligation is completed and the fees are recognized at the time the specific transactional service is provided to the customer. Non-transactional deposit fees are typically monthly account maintenance fees charged on deposit accounts. These are day-to-day contracts that can be canceled by either party without notice. The performance obligation is satisfied and the fees are recognized on a monthly basis after the service period is completed.

Debit and credit card interchange income and expenses

Debit and credit card interchange income represent fees earned when a credit or debit card issued by the Banks is used to purchase goods or services at a merchant. The merchant's bank pays the Banks a default interchange rate set by MasterCard on a transaction by transaction basis. The merchant acquiring bank can stop accepting the Banks’ cards at any time and the Banks can stop further use of cards issued by them at any time. The performance obligation is satisfied and the fees are earned when the cost of the transaction is charged to the Banks cardholders’ card. Direct expenses associated with the credit and debit card are recorded as a net reduction against the interchange income.

Merchant services income

Merchant services income represents fees earned by the Banks for card payment services provided to its merchant customers. The Banks have a contract with a third party to provide card payment services to the Banks’ merchants that contract for those services. The third party provider has contracts with the Banks’ merchants to provide the card payment services. The Banks do not have a direct contractual relationship with its merchants for these services. The Banks set the rates for the services provided by the third party. The third party provider passes the payments made by the Banks’ merchants through to the Banks. The Banks, in turn, pay the third party provider for the services it provides to the Banks’ merchants. These payments to the third party provider are recorded as expenses as a net reduction against fee income. In addition, a portion of the payment received by the Banks represents interchange fees which are passed through to the card issuing bank. Income is primarily earned based on the dollar volume and number of transactions processed. The performance obligation is satisfied and the related fee is earned when each payment is accepted by the processing network.