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Investment Securities (Scheduled Maturities of Securities Available for Sale and Securities Held to Maturity) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Investments [Abstract]
Debt securities available for sale, Due in one year or less, Amortized Cost	$ 1
Debt securities available for sale, Due from one to five years, Amortized Cost	36,525
Debt securities available for sale, Due after five years through ten years, Amortized Cost	162,953
Debt securities available for sale, Due after ten years, Amortized Cost	296,139
Securities available for sale, Amortized Cost	495,618	$ 415,852
Debt securities available for sale, Due in one year or less, Fair Value	1
Debt securities available for sale, Due from one to five years, Fair Value	38,323
Debt securities available for sale, Due after five years through ten years, Fair Value	175,586
Debt securities available for sale, Due after ten years, Fair Value	302,061
Debt securities available for sale, Fair Value	515,971	417,917
Debt securities held to maturity, Due in one year or less, Amortized Cost	48,688
Debt securities held to maturity, Due from one to five years, Amortized Cost	102,292
Debt securities held to maturity, Due after five years through ten years, Amortized Cost	19,076
Debt securities held to maturity, Due after ten years, Amortized Cost	120,898
Securities held to maturity, Amortized Cost	290,954	359,000
Debt securities held to maturity, Due in one year or less, Fair Value	49,234
Debt securities held to maturity, Due from one to five years, Fair Value	106,631
Debt securities held to maturity, Due after five years through ten years, Fair Value	20,008
Debt securities held to maturity, Due after ten years, Fair Value	126,005
Securities held to maturity, Fair Value	$ 301,878	$ 363,259

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Amount of investment in debt security measured at amortized cost (held-to-maturity), with single maturity date and allocated without single maturity date, maturing in next fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 320
-Section 50
-Paragraph 3
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=120252992&loc=d3e62586-112803

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (f)(1)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27232-111563

+ Details

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

X

- 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=121645371&loc=d3e27232-111563

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(6))
-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=SL120269820-111563

+ Details

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

X

- References

No definition available.

+ Details

Name:	us-gaap_InvestmentsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration