Securities (Schedule of Securities Available-for-Sale) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 631,800	$ 626,383
Gross Unrealized Gains	10,400	10,130
Gross Unrealized Losses	(4,360)	(5,518)
Securities Available-for-Sale, at Fair Value	637,840	630,995
U.S. Treasury and Agency Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	10,000	20,000
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(102)	(439)
Securities Available-for-Sale, at Fair Value	9,898	19,561
Obligations of State and Political Subdivisions
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	195,360	147,321
Gross Unrealized Gains	8,286	6,515
Gross Unrealized Losses	(18)	(59)
Securities Available-for-Sale, at Fair Value	203,628	153,777
Mortgage-backed Securities – Residential
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	426,087	458,709
Gross Unrealized Gains	2,114	3,615
Gross Unrealized Losses	(4,240)	(5,020)
Securities Available-for-Sale, at Fair Value	423,961	457,304
Equity Securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	353	353
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Securities Available-for-Sale, at Fair Value	$ 353	$ 353