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Investment Securities - Contractual Maturities of Investment Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019 | Sep. 30, 2019
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Debt Securities, Available-for-sale, Amortized Cost, Fiscal Year Maturity [Abstract] |  |  |
Due in 1 year or less, Securities available for sale, Amortized Cost | $ 7,097 | $ 127 | $ 189
Due in 1 to 5 years, Securities available for sale, Amortized Cost | 23,789 | 36,534 | 36,304
Due in 5 to 10 years, Securities available for sale, Amortized Cost | 58,430 | 93,134 | 91,242
Due after 10 years, Securities available for sale, Amortized Cost | 243,836 | 226,095 | 194,398
Amortized Cost | 333,152 | 355,890 | 322,133
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |  |  |
Due in 1 year or less, Securities available for sale, Fair Value (Estimated) | 7,159 | 127 | 189
Due in 1 to 5 years, Securities available for sale, Fair Value (Estimated) | 24,260 | 36,778 | 36,703
Due in 5 to 10 years, Securities available for sale, Fair Value (Estimated) | 60,086 | 95,014 | 93,419
Due after 10 years, Securities available for sale, Fair Value (Estimated) | 248,635 | 228,601 | 196,487
Securities available for sale, Fair Value (Estimated) | 340,140 | 360,520 | 326,798
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract] |  |  |
Due in 1 year or less, Securities to be held to maturity, Amortized Cost | 2,454 | 1,334 | 1,241
Due in 1 to 5 years, Securities to be held to maturity, Amortized Cost | 32,595 | 25,860 | 23,460
Due in 5 to 10 years, Securities to be held to maturity, Amortized Cost | 176,400 | 179,133 | 184,234
Due after 10 years, Securities to be held to maturity, Amortized Cost | 120,513 | 75,279 | 89,851
Securities to be held to maturity, Amortized Cost | 331,962 | 281,606 | 298,786
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract] |  |  |
Due in 1 year or less, Securities to be held to maturity, Fair Value (Estimated) | 2,462 | 1,338 | 1,245
Due in 1 to 5 years, Securities to be held to maturity, Fair Value (Estimated) | 33,683 | 26,323 | 23,920
Due in 5 to 10 years, Securities to be held to maturity, Fair Value (Estimated) | 182,370 | 182,834 | 188,811
Due after 10 years, Securities to be held to maturity, Fair Value (Estimated) | 123,547 | 76,550 | 92,671
Securities to be held to maturity, Fair Value (Estimated) | $ 342,062 | $ 287,045 | $ 306,647

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