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Investment Securities (Details) - Unrealized gains on investment securities - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Investment securities available-for-sale
Investment Securities Available-for-Sale, Amortized Cost	$ 205,144	$ 194,619
Investment Securities Available-for-Sale, Gross Unrealized Gains	4,084	2,271
Investment Securities Available-for-Sale, Gross Unrealized Losses	(962)	(1,120)
Investment Securities Available-for-Sale, Fair Value	208,266	195,770
Investment securities held-to-maturity
Investment Securities Held-to-Maturity, Amortized Cost	214,718	224,056
Investment Securities Held-to-Maturity, Gross Unrealized Gains	12,728	6,793
Investment Securities Held-to-Maturity, Gross Unrealized Losses	(19)	(291)
Investment Securities Held-to-Maturity, Fair Value	227,427	230,558
Total, Amortized Cost	419,862	418,675
Total, Gross Unrealized Gains	16,812	9,064
Total, Gross Unrealized Losses	(981)	(1,411)
Total, Fair Value	435,693	426,328
US Treasury Securities [Member]
Investment securities held-to-maturity
Investment Securities Held-to-Maturity, Amortized Cost	28,574	28,471
Investment Securities Held-to-Maturity, Gross Unrealized Gains	2,373	755
Investment Securities Held-to-Maturity, Gross Unrealized Losses
Investment Securities Held-to-Maturity, Fair Value	30,947	29,226
Federal Agency Obligations [Member]
Investment securities available-for-sale
Investment Securities Available-for-Sale, Amortized Cost	29,785	29,062
Investment Securities Available-for-Sale, Gross Unrealized Gains	628	142
Investment Securities Available-for-Sale, Gross Unrealized Losses	(10)	(58)
Investment Securities Available-for-Sale, Fair Value	30,403	29,146
Investment securities held-to-maturity
Investment Securities Held-to-Maturity, Amortized Cost	29,459	33,616
Investment Securities Held-to-Maturity, Gross Unrealized Gains	825	280
Investment Securities Held-to-Maturity, Gross Unrealized Losses		(119)
Investment Securities Held-to-Maturity, Fair Value	30,284	33,777
Residential Mortgage Backed Securities [Member]
Investment securities available-for-sale
Investment Securities Available-for-Sale, Amortized Cost	45,718	44,155
Investment Securities Available-for-Sale, Gross Unrealized Gains	1,326	803
Investment Securities Available-for-Sale, Gross Unrealized Losses	(14)	(48)
Investment Securities Available-for-Sale, Fair Value	47,030	44,910
Investment securities held-to-maturity
Investment Securities Held-to-Maturity, Amortized Cost	3,147	3,805
Investment Securities Held-to-Maturity, Gross Unrealized Gains	30	11
Investment Securities Held-to-Maturity, Gross Unrealized Losses	(12)	(6)
Investment Securities Held-to-Maturity, Fair Value	3,165	3,810
Commercial Mortgage Backed Securities [Member]
Investment securities available-for-sale
Investment Securities Available-for-Sale, Amortized Cost	2,949	2,981
Investment Securities Available-for-Sale, Gross Unrealized Gains	125
Investment Securities Available-for-Sale, Gross Unrealized Losses		(9)
Investment Securities Available-for-Sale, Fair Value	3,074	2,972
Investment securities held-to-maturity
Investment Securities Held-to-Maturity, Amortized Cost	1,301	4,110
Investment Securities Held-to-Maturity, Gross Unrealized Gains	44	27
Investment Securities Held-to-Maturity, Gross Unrealized Losses		(2)
Investment Securities Held-to-Maturity, Fair Value	1,345	4,135
US States and Political Subdivisions Debt Securities [Member]
Investment securities available-for-sale
Investment Securities Available-for-Sale, Amortized Cost	38,085	8,188
Investment Securities Available-for-Sale, Gross Unrealized Gains	336	169
Investment Securities Available-for-Sale, Gross Unrealized Losses
Investment Securities Available-for-Sale, Fair Value	38,421	8,357
Investment securities held-to-maturity
Investment Securities Held-to-Maturity, Amortized Cost	115,154	118,015
Investment Securities Held-to-Maturity, Gross Unrealized Gains	7,661	5,001
Investment Securities Held-to-Maturity, Gross Unrealized Losses		(3)
Investment Securities Held-to-Maturity, Fair Value	122,815	123,013
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	506	398
Investment Securities Available-for-Sale, Gross Unrealized Losses	(268)	(231)
Investment Securities Available-for-Sale, Fair Value	16,327	16,255
Corporate Bonds And Notes [Member]
Investment securities available-for-sale
Investment Securities Available-for-Sale, Amortized Cost	34,098	53,566
Investment Securities Available-for-Sale, Gross Unrealized Gains	1,003	702
Investment Securities Available-for-Sale, Gross Unrealized Losses	(182)	(292)
Investment Securities Available-for-Sale, Fair Value	34,919	53,976
Investment securities held-to-maturity
Investment Securities Held-to-Maturity, Amortized Cost	37,083	36,039
Investment Securities Held-to-Maturity, Gross Unrealized Gains	1,795	719
Investment Securities Held-to-Maturity, Gross Unrealized Losses	(7)	(161)
Investment Securities Held-to-Maturity, Fair Value	38,871	36,597
Asset-backed Securities [Member]
Investment securities available-for-sale
Investment Securities Available-for-Sale, Amortized Cost	17,124	20,005
Investment Securities Available-for-Sale, Gross Unrealized Gains		18
Investment Securities Available-for-Sale, Gross Unrealized Losses	(412)	(298)
Investment Securities Available-for-Sale, Fair Value	16,712	19,725
Certificates of Deposit [Member]
Investment securities available-for-sale
Investment Securities Available-for-Sale, Amortized Cost	1,196	1,895
Investment Securities Available-for-Sale, Gross Unrealized Gains	21	18
Investment Securities Available-for-Sale, Gross Unrealized Losses		(8)
Investment Securities Available-for-Sale, Fair Value	1,217	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	16	21
Investment Securities Available-for-Sale, Gross Unrealized Losses	(11)	(23)
Investment Securities Available-for-Sale, Fair Value	381	374
Other Securities [Member]
Investment securities available-for-sale
Investment Securities Available-for-Sale, Amortized Cost	19,724	18,303
Investment Securities Available-for-Sale, Gross Unrealized Gains	123
Investment Securities Available-for-Sale, Gross Unrealized Losses	(65)	(153)
Investment Securities Available-for-Sale, Fair Value	$ 19,782	$ 18,150

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