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Investment Securities (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2018 USD ($) securities	Sep. 30, 2017 USD ($)	Dec. 31, 2017 USD ($)
Available-for-sale: [Abstract]
Amortized Cost	$ 616,029,000		$ 616,029,000		$ 581,543,000
Gross Unrealized Gains	829,000		829,000		2,900,000
Gross Unrealized (Losses)	(17,778,000)		(17,778,000)		(5,864,000)
Fair Value	599,080,000		599,080,000		578,579,000
Debt and Equity Securities, Gain (Loss)	0	$ 254,000	901,000	$ 589,000
Held-to-maturity: [Abstract]
Debt Securities, Held-to-maturity	69,409,000		69,409,000		69,332,000
Debt Securities, Held-to-maturity, Fair Value	67,395,000		67,395,000		68,457,000
Realized Investment Gains (Losses) [Abstract]
Gross gains	0	394,000	941,000	746,000
Gross losses	0	$ (140,000)	(40,000)	$ (157,000)
U.S. Treasury securities and obligations of U.S. government corporations & agencies
Available-for-sale: [Abstract]
Amortized Cost	127,365,000		127,365,000		115,796,000
Gross Unrealized Gains	0		0		8,000
Gross Unrealized (Losses)	(4,696,000)		(4,696,000)		(2,034,000)
Fair Value	122,669,000		122,669,000		113,770,000
Held-to-maturity: [Abstract]
Debt Securities, Held-to-maturity	69,409,000		69,409,000		69,332,000
Debt Securities, Held-to-maturity, Accumulated Unrecognized Gain	0		0		103,000
Debt Securities, Held-to-maturity, Accumulated Unrecognized Loss	(2,014,000)		(2,014,000)		(978,000)
Debt Securities, Held-to-maturity, Fair Value	67,395,000		67,395,000		68,457,000
Obligations of states and political subdivisions
Available-for-sale: [Abstract]
Amortized Cost	176,273,000		176,273,000		165,037,000
Gross Unrealized Gains	570,000		570,000		2,254,000
Gross Unrealized (Losses)	(3,497,000)		(3,497,000)		(1,025,000)
Fair Value	173,346,000		173,346,000		166,266,000
Mortgage-backed securities: GSE residential
Available-for-sale: [Abstract]
Amortized Cost	310,122,000		310,122,000		295,778,000
Gross Unrealized Gains	132,000		132,000		493,000
Gross Unrealized (Losses)	(9,585,000)		(9,585,000)		(2,460,000)
Fair Value	300,669,000		$ 300,669,000		293,811,000
Trust preferred securities
Available-for-sale: [Abstract]
Amortized Cost					2,893,000
Gross Unrealized Gains					0
Gross Unrealized (Losses)					(345,000)
Fair Value					2,548,000
Number of trust preferred securities | securities			1
Debt and Equity Securities, Gain (Loss)	846,000
Other securities
Available-for-sale: [Abstract]
Amortized Cost	2,269,000		$ 2,269,000		2,039,000
Gross Unrealized Gains	127,000		127,000		145,000
Gross Unrealized (Losses)	0		0		0
Fair Value	$ 2,396,000		$ 2,396,000		$ 2,184,000

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