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Investment Securities (Details) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016 USD ($)	Sep. 30, 2015 USD ($)	Sep. 30, 2016 USD ($) securities	Sep. 30, 2015 USD ($)	Dec. 31, 2015 USD ($)
Available-for-sale: [Abstract]
Amortized Cost	$ 546,247		$ 546,247		$ 516,829
Gross Unrealized Gains	11,994		11,994		5,052
Gross Unrealized (Losses)	(1,615)		(1,615)		(3,033)
Fair Value	556,626		556,626		518,848
Gain (Loss) on Sale of Securities, Net	466	$ 1	1,130	$ 231
Held-to-maturity: [Abstract]
Held-to-maturity Securities	101,679		101,679		85,208
Held-to-maturity Securities, Fair Value	102,648		102,648		85,737
Realized Investment Gains (Losses) [Abstract]
Gross gains	466	1	1,130	231
Gross losses	0	$ 0		$ 0
U.S. Treasury securities and obligations of U.S. government corporations & agencies
Available-for-sale: [Abstract]
Amortized Cost	48,546		48,546		90,368
Gross Unrealized Gains	190		190		41
Gross Unrealized (Losses)	0		0		(268)
Fair Value	48,736		48,736		90,141
Held-to-maturity: [Abstract]
Held-to-maturity Securities	101,679		101,679		85,208
Held-to-maturity Securities, Accumulated Unrecognized Holding Gain	1,033		1,033		743
Held-to-maturity Securities, Accumulated Unrecognized Holding Loss	(64)		(64)		(214)
Held-to-maturity Securities, Fair Value	102,648		102,648		85,737
Obligations of states and political subdivisions
Available-for-sale: [Abstract]
Amortized Cost	155,715		155,715		107,164
Gross Unrealized Gains	5,297		5,297		3,608
Gross Unrealized (Losses)	(93)		(93)		(55)
Fair Value	160,919		160,919		110,717
Mortgage-backed securities: GSE residential
Available-for-sale: [Abstract]
Amortized Cost	334,872		334,872		312,132
Gross Unrealized Gains	6,420		6,420		1,374
Gross Unrealized (Losses)	(102)		(102)		(1,452)
Fair Value	341,190		341,190		312,054
Trust preferred securities
Available-for-sale: [Abstract]
Amortized Cost	3,075		3,075		3,130
Gross Unrealized Gains	0		0		0
Gross Unrealized (Losses)	(1,414)		(1,414)		(1,224)
Fair Value	1,661		$ 1,661		1,906
Number of trust preferred securities | securities			1
Trust preferred securities | Maximum [Member]
Available-for-sale: [Abstract]
Maturities of Debt Securities			twenty-one years
Other securities
Available-for-sale: [Abstract]
Amortized Cost	4,039		$ 4,039		4,035
Gross Unrealized Gains	87		87		29
Gross Unrealized (Losses)	(6)		(6)		(34)
Fair Value	$ 4,120		$ 4,120		$ 4,030

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