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Investments - Textual (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($) security	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) security	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Schedule of Available-for-sale Securities
Available-for-sale Securities pledged as collateral	$ 81,989,000		$ 81,989,000
Equity securities	7,184,000		7,184,000		$ 7,423,000
Unrealized gain (loss) of available-for sale securities	(10,401,000)		(10,401,000)		4,089,000
AOCI available-for-sale securities adjustment tax	(3,075,000)		(3,075,000)		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	112,000	$ 71,000	$ 377,000	$ 1,181,000
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	$ 445,098,000		$ 445,098,000
U.S. Government agencies
Schedule of Available-for-sale Securities
Available-for-sale securities, number of positions | security	6		6
Debt securities, amortized cost	$ 22,728,000		$ 22,728,000		65,994,000
U.S. Government agencies | Less than 12 months
Schedule of Available-for-sale Securities
Available-for-sale securities in unrealized loss positions, number of positions | security	5		5
U.S. Government agencies | Greater than 12 months
Schedule of Available-for-sale Securities
Available-for-sale securities in unrealized loss positions, number of positions | security	1		1
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities
Available-for-sale securities, number of positions | security	41		41
Debt securities, amortized cost	$ 65,839,000		$ 65,839,000		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	12		12
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 sponsored entities and agencies collateralized by residential mortgage obligations
Schedule of Available-for-sale Securities
Available-for-sale securities, number of positions | security	142		142
Debt securities, amortized cost	$ 250,331,000		$ 250,331,000		237,210,000
U.S. Government sponsored entities and 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	43		43
U.S. Government sponsored entities and 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	34		34
Private label mortgage and asset backed securities
Schedule of Available-for-sale Securities
Unrealized gain (loss) of available-for sale securities	$ (3,808,000)		$ (3,808,000)
Available-for-sale securities, number of positions | security	31		31
Debt securities, amortized cost	$ 106,200,000		$ 106,200,000		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	10		10
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	11		11
Other equity securities
Schedule of Available-for-sale Securities
Equity securities					7,500,000
Fair Value
Schedule of Available-for-sale Securities
Equity securities	$ 7,184,000		$ 7,184,000		7,423,000
Recurring | Fair Value | Other equity securities
Schedule of Available-for-sale Securities
Equity securities	$ 7,184,000		$ 7,184,000		$ 7,423,000

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