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Investment Securities (Scheduled Maturities of Securities Available for Sale and Securities Held to Maturity) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Investments [Abstract]
Debt securities available for sale, Due in one year or less, Amortized Cost	$ 4,863
Debt securities available for sale, Due from one to five years, Amortized Cost	62,802
Debt securities available for sale, Due after five years through ten years, Amortized Cost	175,663
Debt securities available for sale, Due after ten years, Amortized Cost	855,648
Securities available for sale, Amortized Cost	1,098,976	$ 607,665
Debt securities available for sale, Due in one year or less, Fair Value	4,891
Debt securities available for sale, Due from one to five years, Fair Value	65,773
Debt securities available for sale, Due after five years through ten years, Fair Value	180,702
Debt securities available for sale, Due after ten years, Fair Value	846,584
Debt securities available for sale, Fair Value	1,097,950	628,059
Debt securities held to maturity, Due in one year or less, Amortized Cost	36,191
Debt securities held to maturity, Due from one to five years, Amortized Cost	72,707
Debt securities held to maturity, Due after five years through ten years, Amortized Cost	20,848
Debt securities held to maturity, Due after ten years, Amortized Cost	88,394
Securities held to maturity, Amortized Cost	218,140	271,973
Debt securities held to maturity, Due in one year or less, Fair Value	36,543
Debt securities held to maturity, Due from one to five years, Fair Value	75,317
Debt securities held to maturity, Due after five years through ten years, Fair Value	21,233
Debt securities held to maturity, Due after ten years, Fair Value	91,071
Securities held to maturity, Fair Value	$ 224,164	$ 282,035

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Amount, after allowance for credit loss, 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=123599081&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=123581744&loc=d3e27232-111563

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- 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
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-URI http://asc.fasb.org/extlink&oid=123581744&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=123581744&loc=SL120269820-111563

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- References

No definition available.

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