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Investment Securities - Contractual Maturities of Investment Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019 | Jun. 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 | $ 584 | $ 127 | $ 268
Due in 1 to 5 years, Securities available for sale, Amortized Cost | 26,736 | 36,534 | 21,771
Due in 5 to 10 years, Securities available for sale, Amortized Cost | 63,422 | 93,134 | 102,117
Due after 10 years, Securities available for sale, Amortized Cost | 211,771 | 226,095 | 194,932
Amortized Cost | 302,513 | 355,890 | 319,088
Debt Securities, Available-for-sale, Fair Value, Fiscal Year Maturity [Abstract] |  |  |
Due in 1 year or less, Securities available for sale, Fair Value (Estimated) | 573 | 127 | 269
Due in 1 to 5 years, Securities available for sale, Fair Value (Estimated) | 27,310 | 36,778 | 21,976
Due in 5 to 10 years, Securities available for sale, Fair Value (Estimated) | 65,575 | 95,014 | 104,238
Due after 10 years, Securities available for sale, Fair Value (Estimated) | 218,042 | 228,601 | 196,087
Securities available for sale, Fair Value (Estimated) | 311,500 | 360,520 | 322,570
Debt Securities, Held-to-maturity, Maturity, Amortized Cost, Net [Abstract] |  |  |
Due in 1 year or less, Securities to be held to maturity, Amortized Cost | 1,860 | 1,334 | 1,337
Due in 1 to 5 years, Securities to be held to maturity, Amortized Cost | 32,303 | 25,860 | 21,857
Due in 5 to 10 years, Securities to be held to maturity, Amortized Cost | 179,877 | 179,133 | 186,409
Due after 10 years, Securities to be held to maturity, Amortized Cost | 127,922 | 75,279 | 92,924
Securities to be held to maturity, Amortized Cost | 341,962 | 281,606 | 302,527
Debt Securities, Held-to-maturity, Maturity, Fair Value [Abstract] |  |  |
Due in 1 year or less, Securities to be held to maturity, Fair Value (Estimated) | 1,863 | 1,338 | 1,339
Due in 1 to 5 years, Securities to be held to maturity, Fair Value (Estimated) | 33,367 | 26,323 | 22,026
Due in 5 to 10 years, Securities to be held to maturity, Fair Value (Estimated) | 185,994 | 182,834 | 189,984
Due after 10 years, Securities to be held to maturity, Fair Value (Estimated) | 131,001 | 76,550 | 94,726
Securities to be held to maturity, Fair Value (Estimated) | $ 352,225 | $ 287,045 | $ 308,075

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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