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Investment Securities (Scheduled Maturities of Securities Available for Sale and Securities Held to Maturity) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Investments [Abstract]
Debt securities available for sale, Due in one year or less, Amortized Cost	$ 4,887
Debt securities available for sale, Due from one to five years, Amortized Cost	57,462
Debt securities available for sale, Due after five years through ten years, Amortized Cost	148,739
Debt securities available for sale, Due after ten years, Amortized Cost	541,443
Securities available for sale, Amortized Cost	752,531	$ 607,665
Debt securities available for sale, Due in one year or less, Fair Value	4,946
Debt securities available for sale, Due from one to five years, Fair Value	60,632
Debt securities available for sale, Due after five years through ten years, Fair Value	153,492
Debt securities available for sale, Due after ten years, Fair Value	534,419
Debt securities available for sale, Fair Value	753,489	628,059
Debt securities held to maturity, Due in one year or less, Amortized Cost	46,389
Debt securities held to maturity, Due from one to five years, Amortized Cost	92,903
Debt securities held to maturity, Due after five years through ten years, Amortized Cost	20,252
Debt securities held to maturity, Due after ten years, Amortized Cost	96,590
Securities held to maturity, Amortized Cost	256,134	271,973
Debt securities held to maturity, Due in one year or less, Fair Value	46,684
Debt securities held to maturity, Due from one to five years, Fair Value	96,303
Debt securities held to maturity, Due after five years through ten years, Fair Value	21,018
Debt securities held to maturity, Due after ten years, Fair Value	100,324
Securities held to maturity, Fair Value	$ 264,329	$ 282,035

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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