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Investments - Textual (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2017 USD ($) security investment	Mar. 31, 2016 USD ($) security	Dec. 31, 2014 USD ($)	Dec. 31, 2016 USD ($)
Schedule of Available-for-sale Securities
Available-for-sale Securities pledged as collateral	$ 105,494,000
Unrealized gain (loss) of available-for sale securities	2,562,000			$ (891,000)
AOCI available-for-sale securities adjustment tax	1,077,000			(375,000)
Transfer of securities from available-for-sale to held-to-maturity		$ 8,500,000	$ 31,000,000
Fair value of held-to-maturity investment securities transferred	23,100,000		32,000,000
Unrealized gain on transfer of securities from available-for-sale to held-to-maturity			$ 163,000
Held-to-maturity securities, number of securities sold | security		5
Investments, number of securities sold | security		13
Realized gain (loss) on sold held-to-maturity securities	0	$ 696,000
Income tax impact from the reclassification of unrealized net gains on available-for-sale securities to realized net gains on available-for-sale securities	$ 203,000	465,000
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	136,000
Debt securities, amortized cost	$ 526,678,000
U.S. Government agencies
Schedule of Available-for-sale Securities
Available-for-sale securities, number of positions | security	21
Debt securities, amortized cost	$ 66,472,000			69,005,000
Obligations of states and political subdivisions
Schedule of Available-for-sale Securities
Other than temporary impairment losses, investments, portion in other comprehensive loss, before tax, including portion attributable to noncontrolling interest, available-for-sale securities		$ 136,000
Other than temporary impairment losses, investments, available-for-sale securities, number of impaired securities | security		1
Available-for-sale securities, other than temporary impaired security		$ 2,995,000
Available-for-sale debt securities, other than temporary impairment security, amortized cost basis		$ 3,131,000
Available-for-sale securities, number of positions | security	163
Debt securities, amortized cost	$ 265,764,000			288,543,000
U.S. Government agencies collateralized by residential mortgage obligations
Schedule of Available-for-sale Securities
Available-for-sale securities, number of positions | security	144
Debt securities, amortized cost	$ 185,219,000			181,785,000
Private label residential mortgage backed securities
Schedule of Available-for-sale Securities
Unrealized gain (loss) of available-for sale securities	$ 985,000
Available-for-sale securities, number of positions | security	14
Available-for-sale securities in unrealized loss positions, number of positions | security	0
Debt securities, amortized cost	$ 1,723,000			$ 1,807,000
Other equity securities
Schedule of Available-for-sale Securities
Available for sale securities, number of securities | investment	1
Less than 12 months | U.S. Government agencies
Schedule of Available-for-sale Securities
Available-for-sale securities in unrealized loss positions, number of positions | security	3
Less than 12 months | Obligations of states and political subdivisions
Schedule of Available-for-sale Securities
Available-for-sale securities in unrealized loss positions, number of positions | security	44
Less than 12 months | U.S. Government agencies collateralized by residential mortgage obligations
Schedule of Available-for-sale Securities
Available-for-sale securities in unrealized loss positions, number of positions | security	33
Greater than 12 months | U.S. Government agencies
Schedule of Available-for-sale Securities
Available-for-sale securities in unrealized loss positions, number of positions | security	7
Greater than 12 months | Obligations of states and political subdivisions
Schedule of Available-for-sale Securities
Available-for-sale securities in unrealized loss positions, number of positions | security	0
Greater than 12 months | U.S. Government agencies collateralized by residential mortgage obligations
Schedule of Available-for-sale Securities
Available-for-sale securities in unrealized loss positions, number of positions | security	9
Below investment grade | Private label residential mortgage backed securities
Schedule of Available-for-sale Securities
Available-for-sale securities, number of positions | security	10
Debt securities, amortized cost	$ 1,578,000

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