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Investment Securities Available-for-Sale (Details) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Amortized cost | $ 741,613 | $ 594,386
Gross unrealized gains | 592 | 1,928
Gross unrealized losses | 19,531 | 7,046
Estimated fair value | 722,674 | 589,268
US Agency Securities [Member] |  |
Amortized cost | 236,853 | 198,115
Gross unrealized gains |  | 283
Gross unrealized losses | 6,528 | 2,414
Estimated fair value | 230,325 | 195,984
Residential Mortgage Backed Securities [Member] |  |
Amortized cost | 448,335 | 322,067
Gross unrealized gains | 140 | 187
Gross unrealized losses | 12,126 | 4,418
Estimated fair value | 436,349 | 317,836
Municipal Bonds [Member] |  |
Amortized cost | 48,203 | 60,976
Gross unrealized gains | 391 | 1,295
Gross unrealized losses | 858 | 214
Estimated fair value | 47,736 | 62,057
Corporate Bonds [Member] |  |
Amortized cost | 8,004 | 13,010
Gross unrealized gains | 61 | 163
Gross unrealized losses | 19 |
Estimated fair value | 8,046 | 13,173
Investment Securities [Member] |  |
Amortized cost | 218 | 218
Estimated fair value | $ 218 | $ 218

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- Definition Amount of investment in debt and equity 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 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27232-111563 Reference 3: 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 + Details
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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity 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 and equity 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 and equity 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 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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