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Investment Securities - Summary of Contractual Maturities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
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Available-for-sale Securities, Debt Maturities [Abstract] |  |
Amortized Cost, Due in 1 year or less | $ 111 | $ 253
Fair Value (Estimated), Due in 1 year or less | 112 | 253
Amortized Cost, Due in 1 to 5 years | 841 | 2,251
Fair Value (Estimated), Due in 1 to 5 years | 842 | 2,298
Amortized Cost, Due in 5 to 10 years | 29,003 | 21,043
Fair Value (Estimated), Due in 1 to 5 years | 29,177 | 21,505
Amortized Cost, Due after 10 years | 270,594 | 275,033
Fair Value (Estimated), Due after 10 years | 266,627 | 273,030
Amortized Cost-Equity | 3,296 | 3,274
Fair Value (Estimated)-Equity | 3,414 | 3,330
Amortized Cost | 303,845 | 301,854
Fair Value (Estimated) | 300,172 | 300,416
Held-to-maturity Securities, Debt Maturities [Abstract] |  |
Amortized Cost, Due in 1 year or less | 635 | 906
Fair Value (Estimated), Due in 1 year or less | 637 | 913
Amortized Cost, Due in 1 to 5 years | 18,059 | 13,451
Fair Value (Estimated), Due in 1 to 5 years | 18,164 | 13,714
Amortized Cost, Due in 5 to 10 years | 37,182 | 41,588
Fair Value (Estimated), Due in 1 to 5 years | 37,719 | 42,448
Amortized Cost, Due after 10 years | 200,691 | 170,883
Fair Value (Estimated), Due after 10 years | 203,135 | 168,462
Amortized Cost | 256,567 | 226,828
Fair Value (Estimated) | $ 259,655 | $ 225,537

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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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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