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Securities Available for Sale (Tables)

12 Months Ended

Dec. 31, 2017

Investments Debt And Equity Securities [Abstract]

Summary of the Amortized Cost and Fair Value of Available-for-Sale Investment Securities Corresponding Amounts of Unrealized Gains and Losses

The following table summarizes the amortized cost and fair value of the available-for-sale securities portfolio at December 31, 2017 and 2016 and the corresponding amounts of gross unrealized gains and losses recognized in accumulated other comprehensive income (loss) were as follows:

								Gross				Gross
				Amortized				Unrealized				Unrealized
	2017			Cost				Gains				Losses				Fair Value
U.S. Treasury and U.S. government sponsored    entities				$	8,986			$	0			$	(69	)		$	8,917
State and political subdivisions					188,032				3,614				(643	)			191,003
Corporate bonds					1,238				4				(8	)			1,234
Mortgage-backed securities - residential					161,635				419				(1,604	)			160,450
Collateralized mortgage obligations					17,898				0				(777	)			17,121
Small Business Administration					14,608				0				(396	)			14,212
Equity securities					179				216				(1	)			394
Totals				$	392,576			$	4,253			$	(3,498	)		$	393,331

								Gross				Gross
				Amortized				Unrealized				Unrealized
	2016			Cost				Gains				Losses				Fair Value
U.S. Treasury and U.S. government sponsored    entities				$	5,970			$	5			$	(54	)		$	5,921
State and political subdivisions					157,014				1,049				(2,760	)			155,303
Corporate bonds					1,343				4				(8	)			1,339
Mortgage-backed securities - residential					171,215				1,019				(2,552	)			169,682
Collateralized mortgage obligations					21,397				1				(705	)			20,693
Small Business Administration					17,236				0				(530	)			16,706
Equity securities					168				185				(2	)			351
Totals				$	374,343			$	2,263			$	(6,611	)		$	369,995

Proceeds from Sales of Available-for-Sale Securities and the Associated Gains and Losses

The proceeds from sales of available-for-sale securities and the associated gains and losses were as follows:

					2017				2016				2015
Proceeds				$	54,497			$	11,493			$	102,257
Gross gains					727				389				908
Gross losses					(723	)			(316	)			(814	)

Amortized Cost and Fair Value of the Debt Securities Maturity

The amortized cost and fair value of the debt securities portfolio are shown by expected maturity. Expected maturities may differ from contractual maturities if issuers have the right to call or prepay obligations with or without call or prepayment penalties. Securities not due at a single maturity date are shown separately.

Available for sale						December 31, 2017
						Amortized
Maturity						Cost				Fair Value
Within one year						$	19,061			$	19,030
One to five years							47,277				47,585
Five to ten years							119,195				121,866
Beyond ten years							12,723				12,673
Mortgage-backed securities, collateralized mortgage obligations and    Small Business Administration							194,141				191,783
				Totals		$	392,397			$	392,937

Investment Securities with Unrealized Losses

The following table summarizes the investment securities with unrealized losses at December 31, 2017 and 2016 aggregated by major security type and length of time in a continuous unrealized loss position.

2017
		Less than 12 Months								12 Months or More								Total
		Fair				Unrealized				Fair				Unrealized				Fair				Unrealized
Description of Securities		Value				Loss				Value				Loss				Value				Loss
U.S. Treasury and U.S. government
sponsored entities		$	3,970			$	(34	)		$	1,912			$	(35	)		$	5,882			$	(69	)
State and political subdivisions			33,188				(220	)			25,721				(423	)			58,909				(643	)
Corporate bonds			397				(3	)			383				(5	)			780				(8	)
Mortgage-backed securities - residential			40,072				(400	)			53,760				(1,204	)			93,832				(1,604	)
Collateralized mortgage obligations			1,701				(22	)			15,420				(755	)			17,121				(777	)
Small Business Administration			0				0				14,182				(396	)			14,182				(396	)
Equity securities			22				(1	)			0				0				22				(1	)
Total temporarily impaired		$	79,350			$	(680	)		$	111,378			$	(2,818	)		$	190,728			$	(3,498	)

2016
		Less than 12 Months								12 Months or More								Total
		Fair				Unrealized				Fair				Unrealized				Fair				Unrealized
Description of Securities		Value				Loss				Value				Loss				Value				Loss
U.S. Treasury and U.S. government
sponsored entities		$	4,015			$	(54	)		$	502			$	0			$	4,517			$	(54	)
State and political subdivisions			92,560				(2,745	)			286				(15	)			92,846				(2,760	)
Corporate bonds			786				(8	)			0				0				786				(8	)
Mortgage-backed securities - residential			98,348				(1,823	)			29,743				(729	)			128,091				(2,552	)
Collateralized mortgage obligations			7,956				(108	)			10,972				(597	)			18,928				(705	)
Small Business Administration			8,770				(205	)			7,890				(325	)			16,660				(530	)
Equity securities			44				(2	)			0				0				44				(2	)
Total temporarily impaired		$	212,479			$	(4,945	)		$	49,393			$	(1,666	)		$	261,872			$	(6,611	)

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Tabular disclosure of available-for-sale securities which includes, but is not limited to, changes in the cost basis and fair value, fair value and gross unrealized gain (loss), fair values by type of security, contractual maturity and classification, amortized cost basis, contracts to acquire securities to be accounted for as available-for-sale, debt maturities, transfers to trading, change in net unrealized holding gain (loss) net of tax, continuous unrealized loss position fair value, aggregate losses qualitative disclosures, other than temporary impairment (OTTI) losses or other disclosures related to available for sale securities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62557-112803

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 7
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27337-111563

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-Section 50
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-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

Reference 6: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Topic 320
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-Section 50
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-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27290-111563

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