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Investment Securities - Summary of Investment Security Carrying and Fair Value (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | $ 273,126 | $ 307,843
Gross Unrealized Gains | 446 | 558
Gross Unrealized Losses | 1,962 | 1,382
Fair Value | 271,610 | 307,019
U.S. Treasury and government sponsored entities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 209,908 | 250,794
Gross Unrealized Gains | 391 | 3
Gross Unrealized Losses | 1,439 | 1,336
Fair Value | 208,860 | 249,461
Municipal securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 9,089 | 14,395
Gross Unrealized Gains | 17 | 72
Gross Unrealized Losses | 22 | 46
Fair Value | 9,084 | 14,421
Corporate bonds |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 40,139 | 36,654
Gross Unrealized Gains | 38 | 478
Gross Unrealized Losses | 397 | 0
Fair Value | 39,780 | 37,132
Collateralized loan obligations |  |
Debt Securities, Available-for-sale [Line Items] |  |
Amortized Cost | 13,990 | 6,000
Gross Unrealized Gains | 0 | 5
Gross Unrealized Losses | 104 | 0
Fair Value | $ 13,886 | $ 6,005

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- Definition Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amount, before tax, of unrealized loss in accumulated other comprehensive income (AOCI) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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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). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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