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Investment Securities Available-for-Sale (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Amortized cost | $ 594,386 | $ 541,364
Gross unrealized gains | 1,928 | 2,648
Gross unrealized losses | 7,046 | 5,904
Estimated fair value | 589,268 | 538,108
US Agency Securities [Member] |  |
Amortized cost | 198,115 | 107,425
Gross unrealized gains | 283 | 519
Gross unrealized losses | 2,414 | 1,802
Estimated fair value | 195,984 | 106,142
Residential Mortgage Backed Securities [Member] |  |
Amortized cost | 322,067 | 329,606
Gross unrealized gains | 187 | 324
Gross unrealized losses | 4,418 | 3,691
Estimated fair value | 317,836 | 326,239
Municipal Bonds [Member] |  |
Amortized cost | 60,976 | 94,607
Gross unrealized gains | 1,295 | 1,723
Gross unrealized losses | 214 | 400
Estimated fair value | 62,057 | 95,930
Corporate Bonds [Member] |  |
Amortized cost | 13,010 | 9,508
Gross unrealized gains | 163 | 82
Gross unrealized losses |  | 11
Estimated fair value | 13,173 | 9,579
Other Equity Investments [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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