Securities (Schedule of Securities Available-for-Sale) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 719,555	$ 631,800
Gross Unrealized Gains	4,327	10,400
Gross Unrealized Losses	(14,096)	(4,360)
Fair Value	709,786	637,840
U.S. Treasury and Agency Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	0	10,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	(102)
Fair Value	0	9,898
Obligations of State and Political Subdivisions
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	247,350	195,360
Gross Unrealized Gains	3,847	8,286
Gross Unrealized Losses	(3,678)	(18)
Fair Value	247,519	203,628
MBS/CMO – Residential
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	471,852	426,087
Gross Unrealized Gains	480	2,114
Gross Unrealized Losses	(10,418)	(4,240)
Fair Value	461,914	423,961
Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	353	353
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	$ 353	$ 353

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 3: http://www.xbrl.org/2003/role/presentationRef
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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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