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Investments - Textual (Details)	3 Months Ended
	Mar. 31, 2019 USD ($) security	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)
Schedule of Available-for-sale Securities
Available-for-sale Securities pledged as collateral | $	$ 71,665,000
Unrealized gain (loss) of available-for sale securities | $	1,309,000		$ (6,257,000)
AOCI available-for-sale securities adjustment tax | $	387,000		(1,850,000)
Income tax impact from the reclassification of unrealized net gains on available-for-sale securities to realized net gains on available-for-sale securities | $	$ 311,000	$ 241,000
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 | $	$ 478,313,000
U.S. Government agencies
Schedule of Available-for-sale Securities
Available-for-sale securities, number of positions	6
Debt securities, amortized cost | $	$ 19,263,000		21,723,000
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	4
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	2
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities
Available-for-sale securities, number of positions	55
Debt securities, amortized cost | $	$ 103,581,000		79,886,000
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	0
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	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	132
Debt securities, amortized cost | $	$ 224,597,000		239,388,000
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	21
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	45
Private label mortgage and asset backed securities
Schedule of Available-for-sale Securities
Available-for-sale securities, number of positions	36
Debt securities, amortized cost | $	$ 126,872,000		$ 129,165,000
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	6
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	17

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