Investment Securities (Details 2) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Held-to-Maturity:
After One & Within Five Years	$ 32
Amortized Cost	32	35
Available-for-Sale:
Within One Year	46,923
After One & Within Five Years	136,783
After Five & Within Ten Years	58,393
After Ten Years	100,339
Fair Value	342,438	352,437
Investments' gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position
Less than 12 months, Fair Value	157,049	180,331
Less than 12 months, Gross Unrealized Losses	(4,841)	(7,407)
12 months or longer, Fair Value	12,944	13,435
12 months or longer, Gross Unrealized Losses	(371)	(433)
Total Fair Value	169,993	193,766
Total Gross Unrealized Losses	(5,212)	(7,840)
Securities of government sponsored enterprises
Available-for-Sale:
Within One Year	1,002
After One & Within Five Years	22,765
After Five & Within Ten Years	36,183
Fair Value	59,950	60,789
Investments' gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position
Less than 12 months, Fair Value	58,948	60,789
Less than 12 months, Gross Unrealized Losses	(1,904)	(3,054)
Total Fair Value	58,948	60,789
Total Gross Unrealized Losses	(1,904)	(3,054)
Mortgage-backed securities (residential)
Available-for-Sale:
Within One Year	5,697
After One & Within Five Years	3,260
After Five & Within Ten Years	355
After Ten Years	80,013
Fair Value	89,325	90,869
Investments' gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position
Less than 12 months, Fair Value	61,180	61,983
Less than 12 months, Gross Unrealized Losses	(1,997)	(2,966)
12 months or longer, Fair Value	4,099	4,340
12 months or longer, Gross Unrealized Losses	(56)	(96)
Total Fair Value	65,279	66,323
Total Gross Unrealized Losses	(2,053)	(3,062)
Collateralized mortgage obligations (residential)
Held-to-Maturity:
After One & Within Five Years	32
Amortized Cost	32	35
Available-for-Sale:
Within One Year	8,169
After One & Within Five Years	101,102
After Five & Within Ten Years	18,543
Fair Value	127,814	135,653
Investments' gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position
Less than 12 months, Fair Value	36,455	56,520
Less than 12 months, Gross Unrealized Losses	(920)	(1,329)
12 months or longer, Fair Value	8,845	9,095
12 months or longer, Gross Unrealized Losses	(315)	(337)
Total Fair Value	45,300	65,615
Total Gross Unrealized Losses	(1,235)	(1,666)
Corporate securities
Available-for-Sale:
Within One Year	31,481
After One & Within Five Years	7,761
Fair Value	39,242	39,530
Investments' gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position
Held-to-maturity securities with unrealized losses	0	0
Municipal securities
Available-for-Sale:
Within One Year	574
After One & Within Five Years	1,895
After Five & Within Ten Years	3,312
After Ten Years	20,326
Fair Value	26,107	25,596
Investments' gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position
Less than 12 months, Fair Value	466	1,039
Less than 12 months, Gross Unrealized Losses	(20)	(58)
Total Fair Value	466	1,039
Total Gross Unrealized Losses	$ (20)	$ (58)