Investment Securities (Amortized Cost And Fair Value Of Investment Securities) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Investment [Line Items]
Securities available for sale, Amortized Cost	$ 507,599	$ 528,458
Securities available for sale, Unrealized Gains	1,155	1,681
Securities available for sale, Unrealized Losses	16,526	5,166
Securities available for sale	492,228	524,973
Securities held to maturity, Amortized Cost	474,803	516,466
Securities held to maturity, Unrealized Gains	1,300	2,341
Securities held to maturity, Unrealized Losses	10,561	5,824
Securities held to maturity, fair value	465,542	512,983
U.S. Government Agencies And Government Sponsored Enterprises [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	162,330	163,025
Securities available for sale, Unrealized Gains	11	122
Securities available for sale, Unrealized Losses	4,815	1,258
Securities available for sale	157,526	161,889
State And Political Subdivisions [Member]
Investment [Line Items]
Securities held to maturity, Amortized Cost	250,791	283,557
Securities held to maturity, Unrealized Gains	1,287	2,317
Securities held to maturity, Unrealized Losses	1,559	662
Securities held to maturity, fair value	250,519	285,212
Collateralized Mortgage Obligations [Member] \| Federal National Mortgage Association [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	163	217
Securities available for sale, Unrealized Gains		1
Securities available for sale, Unrealized Losses		1
Securities available for sale	163	217
Securities held to maturity, Amortized Cost	68,906	76,432
Securities held to maturity, Unrealized Losses	2,966	1,958
Securities held to maturity, fair value	65,940	74,474
Collateralized Mortgage Obligations [Member] \| Federal Home Loan Mortgage Corporation [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	40	45
Securities available for sale	40	45
Securities held to maturity, Amortized Cost	85,824	93,810
Securities held to maturity, Unrealized Gains		3
Securities held to maturity, Unrealized Losses	3,705	2,165
Securities held to maturity, fair value	82,119	91,648
Collateralized Mortgage Obligations [Member] \| Government National Mortgage Association [Member]
Investment [Line Items]
Securities held to maturity, Amortized Cost	20,112	22,881
Securities held to maturity, Unrealized Gains		5
Securities held to maturity, Unrealized Losses	811	502
Securities held to maturity, fair value	19,301	22,384
Collateralized Mortgage Obligations [Member] \| Privately Issued [Member]
Investment [Line Items]
Securities available for sale, Unrealized Gains	937	976
Securities available for sale	937	976
Mortgage-Backed Securities [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	345,269	365,433
Securities available for sale, Unrealized Gains	1,144	1,559
Securities available for sale, Unrealized Losses	11,711	3,908
Securities available for sale	334,702	363,084
Securities held to maturity, Amortized Cost	224,012	232,909
Securities held to maturity, Unrealized Gains	13	24
Securities held to maturity, Unrealized Losses	9,002	5,162
Securities held to maturity, fair value	215,023	227,771
Mortgage-Backed Securities [Member] \| Federal National Mortgage Association [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	296,084	311,830
Securities available for sale, Unrealized Gains	52	313
Securities available for sale, Unrealized Losses	9,954	3,220
Securities available for sale	286,182	308,923
Securities held to maturity, Amortized Cost	10,574	9,732
Securities held to maturity, Unrealized Gains		16
Securities held to maturity, Unrealized Losses	340	88
Securities held to maturity, fair value	10,234	9,660
Mortgage-Backed Securities [Member] \| Federal Home Loan Mortgage Corporation [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	38,387	41,290
Securities available for sale, Unrealized Gains	15	76
Securities available for sale, Unrealized Losses	1,655	675
Securities available for sale	36,747	40,691
Securities held to maturity, Amortized Cost	4,662	3,213
Securities held to maturity, Unrealized Losses	226	119
Securities held to maturity, fair value	4,436	3,094
Mortgage-Backed Securities [Member] \| Government National Mortgage Association [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	10,595	12,051
Securities available for sale, Unrealized Gains	140	193
Securities available for sale, Unrealized Losses	102	12
Securities available for sale	10,633	12,232
Securities held to maturity, Amortized Cost	33,934	26,841
Securities held to maturity, Unrealized Gains	13
Securities held to maturity, Unrealized Losses	954	330
Securities held to maturity, fair value	$ 32,993	$ 26,511

Line items represent reporting concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 12
-Sentence Column A

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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