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Investments - Textual (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2018 USD ($) security	Jun. 30, 2017 USD ($)	Jun. 30, 2018 USD ($) security	Jun. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Schedule of Available-for-sale Securities
Available-for-sale Securities pledged as collateral	$ 77,909,000		$ 77,909,000
Equity securities	7,254,000		7,254,000		$ 7,423,000
Unrealized gain (loss) of available-for sale securities	(6,512,000)		(6,512,000)		4,089,000
AOCI available-for-sale securities adjustment tax	(1,925,000)		(1,925,000)		1,186,000
Income tax impact from the reclassification of unrealized net gains on available-for-sale securities to realized net gains on available-for-sale securities	24,000	$ 907,000	$ 265,000	$ 1,110,000
Threshold period of value decline in available-for-sale securities to be considered other than temporary impairment			12 months
Threshold percentage of value decline in available-for-sale securities to be considered other than temporary impairment			10.00%
Threshold amount of value decline in available-for-sale securities to be considered other than temporary impairment			$ 10,000
Other than temporary impairment losses on investment securities			0	$ 0
Debt securities, amortized cost	$ 490,513,000		$ 490,513,000
U.S. Treasury securities
Schedule of Available-for-sale Securities
Available-for-sale securities, number of positions | security	1		1
Debt securities, amortized cost	$ 32,741,000		$ 32,741,000
U.S. Government agencies
Schedule of Available-for-sale Securities
Available-for-sale securities, number of positions | security	2		2
Debt securities, amortized cost	$ 7,228,000		$ 7,228,000		65,994,000
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities
Available-for-sale securities, number of positions | security	67		67
Debt securities, amortized cost	$ 130,743,000		$ 130,743,000		136,955,000
Obligations of states and political subdivisions | Less than 12 months
Schedule of Available-for-sale Securities
Available-for-sale securities in unrealized loss positions, number of positions | security	14		14
Obligations of states and political subdivisions | Greater than 12 months
Schedule of Available-for-sale Securities
Available-for-sale securities in unrealized loss positions, number of positions | security	1		1
U.S. Government agencies collateralized by residential mortgage obligations
Schedule of Available-for-sale Securities
Available-for-sale securities, number of positions | security	141		141
Debt securities, amortized cost	$ 227,027,000		$ 227,027,000		237,210,000
U.S. Government agencies collateralized by residential mortgage obligations | Less than 12 months
Schedule of Available-for-sale Securities
Available-for-sale securities in unrealized loss positions, number of positions | security	51		51
U.S. Government agencies collateralized by residential mortgage obligations | Greater than 12 months
Schedule of Available-for-sale Securities
Available-for-sale securities in unrealized loss positions, number of positions | security	27		27
Private label mortgage and asset backed securities
Schedule of Available-for-sale Securities
Unrealized gain (loss) of available-for sale securities	$ (3,169,000)		$ (3,169,000)
Available-for-sale securities, number of positions | security	29		29
Debt securities, amortized cost	$ 92,774,000		$ 92,774,000		91,033,000
Private label mortgage and asset backed securities | Less than 12 months
Schedule of Available-for-sale Securities
Available-for-sale securities in unrealized loss positions, number of positions | security	12		12
Private label mortgage and asset backed securities | Greater than 12 months
Schedule of Available-for-sale Securities
Available-for-sale securities in unrealized loss positions, number of positions | security	7		7
Other equity securities
Schedule of Available-for-sale Securities
Equity securities					7,500,000
Fair Value
Schedule of Available-for-sale Securities
Equity securities	$ 7,254,000		$ 7,254,000		7,423,000
Recurring | Fair Value | Other equity securities
Schedule of Available-for-sale Securities
Equity securities	$ 7,254,000		$ 7,254,000		$ 7,423,000

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