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Investment securities (Tables)

12 Months Ended

Dec. 31, 2017

Schedule of amortized cost and fair value of investment securities aggregated by investment category

					Gross			Gross
		Amortized			Unrealized			Unrealized			Fair
December 31, 2017		Cost			Gains			Losses			Value
Available-for-sale:
U.S. Treasury securities		$	20,042		$			$	228		$	19,814
U.S. Government-sponsored enterprises			95,358			30			1,740			93,648
State and municipals:
Taxable			14,559			488						15,047
Tax-exempt			103,199			1,136			502			103,833
Residential Mortgage-backed securities:
U.S. Government agencies			14,517			2			85			14,434
U.S. Government-sponsored enterprises			19,752			10			231			19,531
Commercial Mortgage-backed securities:
U.S. Government-sponsored enterprises			6,315						120			6,195
Common equity securities			43			3						46
Total		$	273,785		$	1,669		$	2,906		$	272,548
Held-to-maturity:
Tax-exempt state and municipals		$	6,859		$	152		$	13		$	6,998
Residential Mortgage-backed securities:
U.S. Government agencies			54									54
U.S. Government-sponsored enterprises			2,361			138			4			2,495
Total		$	9,274		$	290		$	17		$	9,547

					Gross			Gross
		Amortized			Unrealized			Unrealized			Fair
December 31, 2016		Cost			Gains			Losses			Value
Available-for-sale:
U.S. Treasury securities		$	7,570					$	132		$	7,438
U.S. Government-sponsored enterprises			82,314		$	79			1,480			80,913
State and municipals:
Taxable			14,698			566			39			15,225
Tax-exempt			110,931			2,309			640			112,600
Residential Mortgage-backed securities:
U.S. Government agencies			21,041			48			47			21,042
U.S. Government-sponsored enterprises			22,303			48			159			22,192
Total		$	258,857		$	3,050		$	2,497		$	259,410
Held-to-maturity:
Tax-exempt state and municipals		$	6,862		$	72		$	67		$	6,867
Residential Mortgage-backed securities:
U.S. Government agencies			68			1						69
U.S. Government-sponsored enterprises			3,587			191						3,778
Total		$	10,517		$	264		$	67		$	10,714

Schedule of fair value and unrealized losses of investment securities in continuous unrealized loss position

		Less Than 12 Months						12 Months or More						Total
		Fair			Unrealized			Fair			Unrealized			Fair			Unrealized
December 31, 2017		Value			Losses			Value			Losses			Value			Losses
U.S. Treasury securities		$	17,350		$	170		$	2,464		$	58		$	19,814		$	228
U.S. Government-sponsored enterprises			39,096			445			51,365			1,295			90,461			1,740
State and municipals:
Taxable
Tax-exempt			54,788			454			3,808			61			58,596			515
Residential Mortgage-backed securities:
U.S. Government agencies			9,484			39			3,968			46			13,452			85
U.S. Government-sponsored enterprises			12,537			103			6,504			132			19,041			235
Commercial Mortgage-backed securities:
U.S. Government-sponsored enterprises			6,195			120									6,195			120
Total		$	139,450		$	1,331		$	68,109		$	1,592		$	207,559		$	2,923

		Less Than 12 Months						12 Months or More						Total
		Fair			Unrealized			Fair			Unrealized			Fair			Unrealized
December 31, 2016		Value			Losses			Value			Losses			Value			Losses
U.S. Treasury securities		$	7,438		$	132								$	7,438		$	132
U.S. Government-sponsored enterprises			59,460			1,480									59,460			1,480
State and municipals:
Taxable			1,035			39									1,035			39
Tax-exempt			55,166			707		$	226						55,392			707
Residential Mortgage-backed securities:
U.S. Government agencies			5,917			27			1,496		$	20			7,413			47
U.S. Government-sponsored enterprises			16,412			85			2,712			74			19,124			159
Total		$	145,428		$	2,470		$	4,434		$	94		$	149,862		$	2,564

Available-for-Sale Securities

Schedule of maturity distribution of fair value

		Fair
December 31, 2017		Value
Within one year		$	12,238
After one but within five years			168,657
After five but within ten years			35,278
After ten years			16,169
			232,342
Mortgage-backed securities			40,160
Total		$	272,502

Held-to-maturity Securities

Schedule of maturity distribution of fair value

		Amortized			Fair
December 31, 2017		Cost			Value
Within one year
After one but within five years
After five but within ten years
After ten years		$	6,859		$	6,998
			6,859			6,998
Mortgage-backed securities			2,415			2,549
Total		$	9,274		$	9,547

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- Definition

Tabular disclosure of maturities of an entity's investments as well as any other information pertinent to the investments.

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- Definition

For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 6
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

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