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Investment Securities - Amortized Cost and Estimated Fair Value of Available for Sale Securities (Details) - USD ($)	Sep. 30, 2018	Dec. 31, 2017	Sep. 30, 2017
Debt Securities, Available-for-sale [Line Items]
Other equity securities	$ 3,257,000	$ 3,414,000	$ 3,368,000
Securities available for sale, Amortized Cost	317,005,000
Securities available for sale, Unrealized Gains	77,000
Securities available for sale, Unrealized Losses	(11,638,000)
Securities available for sale	305,444,000
Amortized Cost		303,845,000	300,268,000
Unrealized Gains		859,000	1,480,000
Unrealized Losses		(4,532,000)	(2,749,000)
Fair Value (Estimated)		300,172,000	298,999,000
US Treasury and Government [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	5,000,000
Unrealized Gains	0
Unrealized Losses	(21,000)
Fair Value (Estimated)	4,979,000
Mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	303,793,000
Unrealized Gains	77,000
Unrealized Losses	(11,300,000)
Fair Value (Estimated)	292,570,000
Amortized Cost		293,689,000	290,151,000
Unrealized Gains		722,000	1,339,000
Unrealized Losses		(4,422,000)	(2,701,000)
Fair Value (Estimated)		289,989,000	288,789,000
State and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	4,955,000
Unrealized Gains	0
Unrealized Losses	(317,000)
Fair Value (Estimated)	$ 4,638,000
Amortized Cost		6,860,000	6,860,000
Unrealized Gains		16,000	28,000
Unrealized Losses		(107,000)	(46,000)
Fair Value (Estimated)		6,769,000	6,842,000
Other equity securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		3,296,000	3,257,000
Unrealized Gains		121,000	113,000
Unrealized Losses		(3,000)	(2,000)
Fair Value (Estimated)		$ 3,414,000	$ 3,368,000

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