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Investment Securities (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($) securities	Sep. 30, 2016 USD ($)	Dec. 31, 2016 USD ($)
Available-for-sale: [Abstract]
Amortized Cost	$ 617,619		$ 617,619		$ 628,895
Gross Unrealized Gains	6,378		6,378		2,037
Gross Unrealized (Losses)	(2,793)		(2,793)		(11,084)
Fair Value	621,204		621,204		619,848
Gain (Loss) on Sale of Securities, Net	254	$ 466	589	$ 1,130
Held-to-maturity: [Abstract]
Held-to-maturity Securities	69,306		69,306		74,231
Held-to-maturity Securities, Fair Value	69,137		69,137		73,096
Realized Investment Gains (Losses) [Abstract]
Gross gains	394	446	746	1,130
Gross losses	(140)	$ 0	(157)	$ 0
U.S. Treasury securities and obligations of U.S. government corporations & agencies
Available-for-sale: [Abstract]
Amortized Cost	126,931		126,931		138,819
Gross Unrealized Gains	484		484		13
Gross Unrealized (Losses)	(1,014)		(1,014)		(2,508)
Fair Value	126,401		126,401		136,324
Held-to-maturity: [Abstract]
Held-to-maturity Securities	69,306		69,306		74,231
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	328		328		203
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	(497)		(497)		(1,338)
Held-to-maturity Securities, Fair Value	69,137		69,137		73,096
Obligations of states and political subdivisions
Available-for-sale: [Abstract]
Amortized Cost	169,526		169,526		164,163
Gross Unrealized Gains	3,486		3,486		1,346
Gross Unrealized (Losses)	(486)		(486)		(2,804)
Fair Value	172,526		172,526		162,705
Mortgage-backed securities: GSE residential
Available-for-sale: [Abstract]
Amortized Cost	314,195		314,195		318,829
Gross Unrealized Gains	2,223		2,223		531
Gross Unrealized (Losses)	(1,061)		(1,061)		(4,369)
Fair Value	315,357		315,357		314,991
Trust preferred securities
Available-for-sale: [Abstract]
Amortized Cost	2,933		2,933		3,050
Gross Unrealized Gains	0		0		0
Gross Unrealized (Losses)	(232)		(232)		(1,398)
Fair Value	2,701		$ 2,701		1,652
Number of trust preferred securities | securities			1
Trust preferred securities | Maximum [Member]
Available-for-sale: [Abstract]
Maturities of Debt Securities			twenty years
Other securities
Available-for-sale: [Abstract]
Amortized Cost	4,034		$ 4,034		4,034
Gross Unrealized Gains	185		185		147
Gross Unrealized (Losses)	0		0		(5)
Fair Value	$ 4,219		$ 4,219		$ 4,176

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