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Investment Securities - Summary of Contractual Maturities (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Available-for-sale Securities, Debt Maturities [Abstract] |  |
Amortized Cost, Due in 1 year or less | $ 0 | $ 111
Fair Value (Estimated), Due in 1 year or less | 0 | 112
Amortized Cost, Due in 1 to 5 years | 13,501 | 841
Fair Value (Estimated), Due in 1 to 5 years | 13,518 | 842
Amortized Cost, Due in 5 to 10 years | 83,954 | 29,003
Fair Value (Estimated), Due in 1 to 5 years | 83,326 | 29,177
Amortized Cost, Due after 10 years | 226,354 | 270,594
Fair Value (Estimated), Due after 10 years | 220,572 | 266,627
Securities available-for-sale, Amortized Cost | 323,809 |
Fair Value (Estimated) | 317,416 |
Equity securities, Amortized Cost |  | 323
Equity securities, Fair Value (Estimated) |  | 441
Amortized Cost |  | 300,872
Fair Value (Estimated) |  | 297,199
Debt Securities, Held-to-maturity, Maturity [Abstract] |  |
Amortized Cost, Due in 1 year or less | 1,432 | 635
Fair Value (Estimated), Due in 1 year or less | 1,433 | 637
Amortized Cost, Due in 1 to 5 years | 20,717 | 18,059
Fair Value (Estimated), Due in 1 to 5 years | 20,778 | 18,164
Amortized Cost, Due in 5 to 10 years | 157,544 | 37,182
Fair Value (Estimated), Due in 1 to 5 years | 155,313 | 37,719
Amortized Cost, Due after 10 years | 75,970 | 200,691
Fair Value (Estimated), Due after 10 years | 73,376 | 203,135
Amortized Cost | 255,663 | 256,567
Fair Value (Estimated) | $ 250,900 | $ 259,655

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- Definition Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in sixth fiscal year through tenth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27198-111563 + Details
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