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Investment securities (Tables)

12 Months Ended

Dec. 31, 2016

Amortized cost and fair value of investment securities aggregated by investment category

					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
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
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

					Gross			Gross
		Amortized			Unrealized			Unrealized			Fair
December 31, 2015		Cost			Gains			Losses			Value
Available-for-sale:
U.S. Treasury securities		$	10,030					$	31		$	9,999
U.S. Government-sponsored enterprises			68,831		$	291			62			69,060
State and municipals:
Taxable			15,842			735			32			16,545
Tax-exempt			121,099			3,915			90			124,924
Mortgage-backed securities:
U.S. Government agencies			31,612			73			117			31,568
U.S. Government-sponsored enterprises			32,928			119			208			32,839
Total		$	280,342		$	5,133		$	540		$	284,935
Held-to-maturity:
Tax-exempt state and municipals		$	6,865		$	186		$	16		$	7,035
Mortgage-backed securities:
U.S. Government agencies			84			1						85
U.S. Government-sponsored enterprises			5,160			326						5,486
Total		$	12,109		$	513		$	16		$	12,606

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, 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
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

		Less Than 12 Months						12 Months or More						Total
		Fair			Unrealized			Fair			Unrealized			Fair			Unrealized
December 31, 2015		Value			Losses			Value			Losses			Value			Losses
U.S. Treasury securities		$	9,999		$	31								$	9,999		$	31
U.S. Government-sponsored enterprises			34,159			62									34,159			62
State and municipals:
Taxable								$	532		$	32			532			32
Tax-exempt			21,341			87			1,952			19			23,293			106
Mortgage-backed securities:
U.S. Government agencies			15,114			56			5,477			61			20,591			117
U.S. Government-sponsored enterprises			17,647			104			6,030			104			23,677			208
Total		$	98,260		$	340		$	13,991		$	216		$	112,251		$	556

Available-for-Sale Securities

Maturity distribution of fair value

		Fair
December 31, 2016		Value
Within one year		$	37,123
After one but within five years			105,581
After five but within ten years			51,940
After ten years			21,531
			216,175
Mortgage-backed securities			43,235
Total		$	259,410

Held-to-maturity Securities

Maturity distribution of fair value

		Amortized			Fair
December 31, 2016		Cost			Value
Within one year
After one but within five years
After five but within ten years
After ten years		$	6,862		$	6,867
			6,862			6,867
Mortgage-backed securities			3,655			3,847
Total		$	10,517		$	10,714

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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=27724398&loc=d3e27290-111563

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