Investment Securities (Details) - Unrealized gains on investment securities - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Investment securities available-for-sale
Investment Securities Available-for-Sale, Amortized Cost	$ 189,285	$ 194,619
Investment Securities Available-for-Sale, Gross Unrealized Gains	3,346	2,271
Investment Securities Available-for-Sale, Gross Unrealized Losses	(1,300)	(1,120)
Investment Securities Available-for-Sale, Fair Value	191,331	195,770
Investment securities held-to-maturity
Investment Securities Held-to-Maturity, Amortized Cost	219,373	224,056
Investment Securities Held-to-Maturity, Gross Unrealized Gains	10,252	6,793
Investment Securities Held-to-Maturity, Gross Unrealized Losses	(155)	(291)
Investment Securities Held-to-Maturity, Fair Value	229,470	230,558
Total, Amortized Cost	408,658	418,675
Total, Gross Unrealized Gains	13,598	9,064
Total, Gross Unrealized Losses	(1,455)	(1,411)
Total, Fair Value	420,801	426,328
US Treasury Securities [Member]
Investment securities held-to-maturity
Investment Securities Held-to-Maturity, Amortized Cost	28,523	28,471
Investment Securities Held-to-Maturity, Gross Unrealized Gains	$ 1,890	$ 755
Investment Securities Held-to-Maturity, Gross Unrealized Losses
Investment Securities Held-to-Maturity, Fair Value	$ 30,413	$ 29,226
Federal Agency Obligations [Member]
Investment securities available-for-sale
Investment Securities Available-for-Sale, Amortized Cost	31,370	29,062
Investment Securities Available-for-Sale, Gross Unrealized Gains	486	142
Investment Securities Available-for-Sale, Gross Unrealized Losses	(29)	(58)
Investment Securities Available-for-Sale, Fair Value	31,827	29,146
Investment securities held-to-maturity
Investment Securities Held-to-Maturity, Amortized Cost	31,567	33,616
Investment Securities Held-to-Maturity, Gross Unrealized Gains	700	280
Investment Securities Held-to-Maturity, Gross Unrealized Losses	(8)	(119)
Investment Securities Held-to-Maturity, Fair Value	33,259	33,777
Residential Mortgage Backed Securities [Member]
Investment securities available-for-sale
Investment Securities Available-for-Sale, Amortized Cost	47,404	44,155
Investment Securities Available-for-Sale, Gross Unrealized Gains	1,162	803
Investment Securities Available-for-Sale, Gross Unrealized Losses	(21)	(48)
Investment Securities Available-for-Sale, Fair Value	48,545	44,910
Investment securities held-to-maturity
Investment Securities Held-to-Maturity, Amortized Cost	3,489	3,805
Investment Securities Held-to-Maturity, Gross Unrealized Gains	28	11
Investment Securities Held-to-Maturity, Gross Unrealized Losses	(15)	(6)
Investment Securities Held-to-Maturity, Fair Value	3,502	3,810
Commercial Mortgage Backed Securities [Member]
Investment securities available-for-sale
Investment Securities Available-for-Sale, Amortized Cost	2,965	$ 2,981
Investment Securities Available-for-Sale, Gross Unrealized Gains	$ 88
Investment Securities Available-for-Sale, Gross Unrealized Losses		$ (9)
Investment Securities Available-for-Sale, Fair Value	$ 3,053	2,972
Investment securities held-to-maturity
Investment Securities Held-to-Maturity, Amortized Cost	1,317	4,110
Investment Securities Held-to-Maturity, Gross Unrealized Gains	$ 30	27
Investment Securities Held-to-Maturity, Gross Unrealized Losses		(2)
Investment Securities Held-to-Maturity, Fair Value	$ 1,347	4,135
US States and Political Subdivisions Debt Securities [Member]
Investment securities available-for-sale
Investment Securities Available-for-Sale, Amortized Cost	9,642	8,188
Investment Securities Available-for-Sale, Gross Unrealized Gains	$ 164	$ 169
Investment Securities Available-for-Sale, Gross Unrealized Losses
Investment Securities Available-for-Sale, Fair Value	$ 9,806	$ 8,357
Investment securities held-to-maturity
Investment Securities Held-to-Maturity, Amortized Cost	117,416	118,015
Investment Securities Held-to-Maturity, Gross Unrealized Gains	$ 6,208	5,001
Investment Securities Held-to-Maturity, Gross Unrealized Losses		(3)
Investment Securities Held-to-Maturity, Fair Value	$ 123,624	123,013
Corporate Bonds And Notes [Member]
Investment securities available-for-sale
Investment Securities Available-for-Sale, Amortized Cost	40,771	53,566
Investment Securities Available-for-Sale, Gross Unrealized Gains	873	702
Investment Securities Available-for-Sale, Gross Unrealized Losses	(256)	(292)
Investment Securities Available-for-Sale, Fair Value	41,388	53,976
Investment securities held-to-maturity
Investment Securities Held-to-Maturity, Amortized Cost	37,061	36,039
Investment Securities Held-to-Maturity, Gross Unrealized Gains	1,396	719
Investment Securities Held-to-Maturity, Gross Unrealized Losses	(132)	(161)
Investment Securities Held-to-Maturity, Fair Value	38,325	36,597
Trust Preferred Securities [Member]
Investment securities available-for-sale
Investment Securities Available-for-Sale, Amortized Cost	16,089	16,088
Investment Securities Available-for-Sale, Gross Unrealized Gains	440	398
Investment Securities Available-for-Sale, Gross Unrealized Losses	(350)	(231)
Investment Securities Available-for-Sale, Fair Value	16,179	16,255
Asset-backed Securities [Member]
Investment securities available-for-sale
Investment Securities Available-for-Sale, Amortized Cost	$ 18,682	20,005
Investment Securities Available-for-Sale, Gross Unrealized Gains		18
Investment Securities Available-for-Sale, Gross Unrealized Losses	$ (528)	(298)
Investment Securities Available-for-Sale, Fair Value	18,154	19,725
Certificates of Deposit [Member]
Investment securities available-for-sale
Investment Securities Available-for-Sale, Amortized Cost	1,496	1,895
Investment Securities Available-for-Sale, Gross Unrealized Gains	$ 20	18
Investment Securities Available-for-Sale, Gross Unrealized Losses		(8)
Investment Securities Available-for-Sale, Fair Value	$ 1,516	1,905
Equity Securities [Member]
Investment securities available-for-sale
Investment Securities Available-for-Sale, Amortized Cost	376	376
Investment Securities Available-for-Sale, Gross Unrealized Gains	29	21
Investment Securities Available-for-Sale, Gross Unrealized Losses	(28)	(23)
Investment Securities Available-for-Sale, Fair Value	377	374
Other Securities [Member]
Investment securities available-for-sale
Investment Securities Available-for-Sale, Amortized Cost	20,490	$ 18,303
Investment Securities Available-for-Sale, Gross Unrealized Gains	84
Investment Securities Available-for-Sale, Gross Unrealized Losses	(88)	$ (153)
Investment Securities Available-for-Sale, Fair Value	$ 20,486	$ 18,150