Investment Securities (Summary of Amortized Cost and Fair Value of Available-For-Sale Investment Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Available-for-sale Securities
Investment securities available-for-sale, Amortized Cost	$ 455,174	$ 556,636	$ 686,128
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	4,174	1,468	2,545
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	796	4,373	2,967
Available-for-sale Securities, Total	458,552	553,731	685,706
US Treasury Securities [Member]
Available-for-sale Securities
Investment securities available-for-sale, Amortized Cost	5,781	5,773	8,270
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	29	0	24
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	0	8	0
Available-for-sale Securities, Total	5,810	5,765	8,294
Government sponsored agencies [Member]
Available-for-sale Securities
Investment securities available-for-sale, Amortized Cost	156,843	195,711	227,424
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	715	78	683
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	536	800	200
Available-for-sale Securities, Total	157,022	194,989	227,907
State and political subdivisions [Member]
Available-for-sale Securities
Investment securities available-for-sale, Amortized Cost	12,901	14,731	26,476
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	319	395	503
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	0	6	14
Available-for-sale Securities, Total	13,220	15,120	26,965
Residential mortgage-backed securities [Member]
Available-for-sale Securities
Investment securities available-for-sale, Amortized Cost	166,582	189,452	213,621
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	2,034	538	742
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	0	2,222	1,694
Available-for-sale Securities, Total	168,616	187,768	212,669
Collateralized Mortgage Obligations [Member]
Available-for-sale Securities
Investment securities available-for-sale, Amortized Cost	100,433	133,256	167,768
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	611	111	245
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	195	1,137	981
Available-for-sale Securities, Total	100,849	132,230	167,032
Corporate bonds [Member]
Available-for-sale Securities
Investment securities available-for-sale, Amortized Cost	9,746	14,825	39,680
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	30	2	76
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	64	200	78
Available-for-sale Securities, Total	9,712	14,627	39,678
Preferred stock [Member]
Available-for-sale Securities
Investment securities available-for-sale, Amortized Cost	2,888	2,888	2,889
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax	436	344	272
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax	1	0	0
Available-for-sale Securities, Total	$ 3,323	$ 3,232	$ 3,161

Amortized cost and estimated fair value of investment securities.

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 25
-Paragraph 1
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-URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558

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-Publisher FASB
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562

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This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.2)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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