5. Revenue Recognition

Management determined that the primary sources of revenue associated with financial instruments, including interest income on loans and investments, along with certain noninterest revenue sources including investment security gains, loan servicing charges, gains on the sale of loans, and bank owned life insurance income are not within the scope of Topic 606. As a result, no changes were made during the period related to these sources of revenue, which cumulatively comprise 78.3% of the total revenue of the Company.

Noninterest income within the scope of Topic 606 are as follows:

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Trust and investment advisory fees — Trust and investment advisory income is primarily comprised of fees earned from the management and administration of trusts and customer investment portfolios. The Company’s performance obligation is generally satisfied over a period of time and the resulting fees are billed monthly or quarterly, based upon the month end market value of the assets under management. Payment is generally received after month end through a direct charge to customers’ accounts. Other performance obligations (such as delivery of account statements to customers) are generally considered immaterial to the overall transactions price. Commissions on transactions are recognized on a trade-date basis as the performance obligation is satisfied at the point in time in which the trade is processed.

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Service charges on deposit accounts — The Company has contracts with its deposit account customers where fees are charged for certain items or services. Service charges include account analysis fees, monthly service fees, overdraft fees, and other deposit account related fees. Revenue related to account analysis fees and service fees is recognized on a monthly basis as the Company has an unconditional right to the fee consideration. Fees attributable to specific performance obligations of the Company (i.e. overdraft fees, etc.) are recognized at a defined point in time based on completion of the requested service or transaction.

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Other noninterest income — Other noninterest income consists of other recurring revenue streams such as commissions for the sale of mutual funds, annuities, and life insurance products, safe deposit box rental fees, gain (loss) on sale of other real estate owned and other miscellaneous revenue streams. Commissions on the sale of mutual funds, annuities, and life insurance products are recognized when sold, which is when the Company has satisfied its performance obligation. Safe deposit box rental fees are charged to the customer on an annual basis and recognized when billed. However, if the safe deposit box rental fee is prepaid (i.e. paid prior to issuance of annual bill), the revenue is recognized upon receipt of payment. The Company has determined that since rentals and renewals occur consistently over time, revenue is recognized on a basis consistent with the duration of the performance obligation. Gains and losses on the sale of other real estate owned are recognized at the completion of the property sale when the buyer obtains control of the real estate and all the performance obligations of the Company have been satisfied.

The following presents noninterest income, segregated by revenue streams in-scope and out-of-scope of Topic 606, for the three months ended March 31, 2018 and 2017 (in thousands).

	Three months ended March 31,
	2018		2017
Noninterest income:
In-scope of Topic 606
Trust and investment advisory fees	$	2,278	$	2,166
Service charges on deposit accounts		383		374
Other		566		540
Noninterest income (in-scope of topic 606)		3,227		3,080
Noninterest income (out-of-scope of topic 606)		408		482
Total noninterest income	$	3,635	$	3,562