Investment Securities Held-to-maturity Securities (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Schedule of Held-to-maturity Securities
Amortized Cost	$ 45,728,000	$ 48,468,000
Gross Unrealized Gains	757,000	646,000
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	632,000	672,000
Fair Value	45,853,000	48,442,000
Gross realized gains or losses	0	0	$ 0
States and political subdivisions
Schedule of Held-to-maturity Securities
Amortized Cost	3,831,000	3,841,000
Gross Unrealized Gains	394,000	448,000
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	4,000	7,000
Fair Value	4,221,000	4,282,000
Residential mortgage-backed securities
Schedule of Held-to-maturity Securities
Amortized Cost	35,367,000	36,945,000
Gross Unrealized Gains	363,000	189,000
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	534,000	394,000
Fair Value	35,196,000	36,740,000
Commercial mortgage-backed securities
Schedule of Held-to-maturity Securities
Amortized Cost	6,530,000	7,682,000
Gross Unrealized Gains	0	9,000
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	94,000	271,000
Fair Value	$ 6,436,000	$ 7,420,000