Investment Securities (Amortized Cost And Fair Value Of Investment Securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Investment [Line Items]
Securities available for sale, Amortized Cost	$ 476,118	$ 528,458
Securities available for sale, Unrealized Gains	920	1,681
Securities available for sale, Unrealized Losses	18,728	5,166
Securities available for sale	458,310	524,973
Securities held to maturity, Amortized Cost	459,623	516,466
Securities held to maturity, Unrealized Gains	519	2,341
Securities held to maturity, Unrealized Losses	12,424	5,824
Securities held to maturity, fair value	447,718	512,983
U.S. Government Agencies And Government Sponsored Enterprises [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	157,786	163,025
Securities available for sale, Unrealized Gains		122
Securities available for sale, Unrealized Losses	5,977	1,258
Securities available for sale	151,809	161,889
State And Political Subdivisions [Member]
Investment [Line Items]
Securities held to maturity, Amortized Cost	241,637	283,557
Securities held to maturity, Unrealized Gains	519	2,317
Securities held to maturity, Unrealized Losses	2,192	662
Securities held to maturity, fair value	239,964	285,212
Collateralized Mortgage Obligations [Member] \| Federal National Mortgage Association [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	139	217
Securities available for sale, Unrealized Gains		1
Securities available for sale, Unrealized Losses		1
Securities available for sale	139	217
Securities held to maturity, Amortized Cost	65,130	76,432
Securities held to maturity, Unrealized Losses	3,270	1,958
Securities held to maturity, fair value	61,860	74,474
Collateralized Mortgage Obligations [Member] \| Federal Home Loan Mortgage Corporation [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	39	45
Securities available for sale	39	45
Securities held to maturity, Amortized Cost	81,676	93,810
Securities held to maturity, Unrealized Gains		3
Securities held to maturity, Unrealized Losses	4,103	2,165
Securities held to maturity, fair value	77,573	91,648
Collateralized Mortgage Obligations [Member] \| Government National Mortgage Association [Member]
Investment [Line Items]
Securities held to maturity, Amortized Cost	18,824	22,881
Securities held to maturity, Unrealized Gains		5
Securities held to maturity, Unrealized Losses	867	502
Securities held to maturity, fair value	17,957	22,384
Collateralized Mortgage Obligations [Member] \| Privately Issued [Member]
Investment [Line Items]
Securities available for sale, Unrealized Gains	850	976
Securities available for sale	850	976
Mortgage-Backed Securities [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	318,332	365,433
Securities available for sale, Unrealized Gains	920	1,559
Securities available for sale, Unrealized Losses	12,751	3,908
Securities available for sale	306,501	363,084
Securities held to maturity, Amortized Cost	217,986	232,909
Securities held to maturity, Unrealized Gains		24
Securities held to maturity, Unrealized Losses	10,232	5,162
Securities held to maturity, fair value	207,754	227,771
Mortgage-Backed Securities [Member] \| Federal National Mortgage Association [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	275,416	311,830
Securities available for sale, Unrealized Gains	39	313
Securities available for sale, Unrealized Losses	10,778	3,220
Securities available for sale	264,677	308,923
Securities held to maturity, Amortized Cost	12,032	9,732
Securities held to maturity, Unrealized Gains		16
Securities held to maturity, Unrealized Losses	467	88
Securities held to maturity, fair value	11,565	9,660
Mortgage-Backed Securities [Member] \| Federal Home Loan Mortgage Corporation [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	37,088	41,290
Securities available for sale, Unrealized Gains	10	76
Securities available for sale, Unrealized Losses	1,847	675
Securities available for sale	35,251	40,691
Securities held to maturity, Amortized Cost	4,616	3,213
Securities held to maturity, Unrealized Losses	272	119
Securities held to maturity, fair value	4,344	3,094
Mortgage-Backed Securities [Member] \| Government National Mortgage Association [Member]
Investment [Line Items]
Securities available for sale, Amortized Cost	5,650	12,051
Securities available for sale, Unrealized Gains	21	193
Securities available for sale, Unrealized Losses	126	12
Securities available for sale	5,545	12,232
Securities held to maturity, Amortized Cost	35,708	26,841
Securities held to maturity, Unrealized Losses	1,253	330
Securities held to maturity, fair value	$ 34,455	$ 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

+ Details

Name:	invest_InvestmentLineItems
Namespace Prefix:	invest_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_AvailableForSaleSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

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

+ References

No definition available.

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

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

No definition available.

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesAmortizedCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 45
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=109979856&loc=d3e26610-111562

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

+ Details

Name:	us-gaap_HeldToMaturitySecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Amount of accumulated unrecognized gain on investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

+ Details

Name:	us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingGain
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of accumulated unrealized loss on investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

+ Details

Name:	us-gaap_HeldToMaturitySecuritiesAccumulatedUnrecognizedHoldingLoss
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Fair value of investment in debt security measured at amortized cost (held-to-maturity).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (aa)
-URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563

+ Details

Name:	us-gaap_HeldToMaturitySecuritiesFairValue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USGovernmentSponsoredEnterprisesDebtSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_USStatesAndPoliticalSubdivisionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CollateralizedMortgageObligationsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_FederalNationalMortgageAssociationCertificatesAndObligationsFNMAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_FederalHomeLoanMortgageCorporationCertificatesAndObligationsFHLMCMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_GovernmentNationalMortgageAssociationCertificatesAndObligationsGNMAMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_MortgageBackedSecuritiesIssuedByPrivateEnterprisesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_MortgageBackedSecuritiesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: