Regulatory Capital Requirements (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016
FHLB available credit	$ 86,200
Tier One Risk Based Capital	148,072	$ 145,008
Repayment of outsanding Cumulative Preferred Stock	20,000	10,000
Unsecured Debt [Member]
Line of credit facility, current borrowing capacity	75,000
Secured Debt [Member]
Line of credit facility, current borrowing capacity	7,000
TPS Debentures [Member]
Tier One Risk Based Capital	30,900
Cumulative Preferred Stock [Member]
Repayment of outsanding Cumulative Preferred Stock	20,000
Parent Company [Member]
Repayment of outsanding Cumulative Preferred Stock	$ 20,000	$ 10,000