Securities, Securities in Continuous Unrealized Loss Position (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017 USD ($) Security Institution	Dec. 31, 2016 USD ($)
Securities in Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 14,467	$ 20,112
Less than 12 months, unrealized (losses)	(129)	(558)
12 months or more, fair value	4,053	3,790
12 months or more, unrealized (losses)	(515)	(881)
Total, fair value	18,520	23,902
Total, unrealized (losses)	$ (644)	(1,439)
Impaired Securities [Abstract]
Number of securities in a loss position | Security	18
Amortized cost	$ 63,915	51,130
Gross unrealized (losses)	$ (644)	(1,439)
Number of different financial institutions per bond | Institution	57
Estimated maturity	17 years
Anniversary on which securities could have been called at par	5 years
Frequency of repricing	3 months
Interest income on performing bonds	$ 67
LIBOR [Member]
Impaired Securities [Abstract]
Term of variable rate	3 months
Obligations of U.S. Government Corporations and Agencies [Member]
Securities in Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	$ 12,830	18,942
Less than 12 months, unrealized (losses)	(115)	(400)
12 months or more, fair value	1,393	1,507
12 months or more, unrealized (losses)	(45)	(59)
Total, fair value	14,223	20,449
Total, unrealized (losses)	(160)	(459)
Impaired Securities [Abstract]
Amortized cost	45,774	40,781
Gross unrealized (losses)	(160)	(459)
Obligations of States and Political Subdivisions [Member]
Securities in Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	615	293
Less than 12 months, unrealized (losses)	(3)	(18)
12 months or more, fair value	0	0
12 months or more, unrealized (losses)	0	0
Total, fair value	615	293
Total, unrealized (losses)	(3)	(18)
Impaired Securities [Abstract]
Amortized cost	13,979	6,228
Gross unrealized (losses)	(3)	(18)
Corporate Bonds [Member]
Securities in Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	640	503
Less than 12 months, unrealized (losses)	(9)	(136)
12 months or more, fair value	2,660	2,283
12 months or more, unrealized (losses)	(470)	(822)
Total, fair value	3,300	2,786
Total, unrealized (losses)	$ (479)	(958)
Impaired Securities [Abstract]
Number of impaired securities | Security	3
Amortized cost	$ 3,780	3,743
Gross unrealized (losses)	(479)	(958)
Mutual Funds [Member]
Securities in Continuous Unrealized Loss Position [Abstract]
Less than 12 months, fair value	382	374
Less than 12 months, unrealized (losses)	(2)	(4)
12 months or more, fair value	0	0
12 months or more, unrealized (losses)	0	0
Total, fair value	382	374
Total, unrealized (losses)	(2)	(4)
Impaired Securities [Abstract]
Amortized cost	382	378
Gross unrealized (losses)	$ (2)	$ (4)