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Investment Securities - Summary of Investment Security Carrying and Fair Value (Details) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
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Available-for-sale Debt Securities, Amortized Cost Basis [Abstract] |  |
Amortized Cost | $ 299,386 | $ 307,843
Gross Unrealized Gains | 346 | 558
Gross Unrealized Losses | 2,159 | 1,382
Fair Value | 297,573 | 307,019
U.S. Treasury and government sponsored entities |  |
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract] |  |
Amortized Cost | 245,429 | 250,794
Gross Unrealized Gains | 0 | 3
Gross Unrealized Losses | 2,111 | 1,336
Fair Value | 243,318 | 249,461
Municipal securities |  |
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract] |  |
Amortized Cost | 13,805 | 14,395
Gross Unrealized Gains | 18 | 72
Gross Unrealized Losses | 47 | 46
Fair Value | 13,776 | 14,421
Corporate bonds |  |
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract] |  |
Amortized Cost | 34,152 | 36,654
Gross Unrealized Gains | 317 | 478
Gross Unrealized Losses | 0 | 0
Fair Value | 34,469 | 37,132
Collateralized loan obligations |  |
Available-for-sale Debt Securities, Amortized Cost Basis [Abstract] |  |
Amortized Cost | 6,000 | 6,000
Gross Unrealized Gains | 11 | 5
Gross Unrealized Losses | 1 | 0
Fair Value | $ 6,010 | $ 6,005

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 investments in debt securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 2: 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 + Details
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- Definition Amount of debt securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=75030427&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82896770&loc=d3e26610-111562 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 2 -Subparagraph (b)-(g) -URI http://asc.fasb.org/extlink&oid=75019621&loc=d3e62557-112803 + Details
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