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Investment Securities Available-for-Sale (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016
--- | --- | --- | ---
Amortized cost | $ 557,744 | $ 541,364 |
Gross unrealized gains | 2,595 | 2,648 |
Gross unrealized losses | 4,313 | 5,904 |
Estimated fair value | 556,026 | 538,108 | $ 430,668
US Agency Securities [Member] |  |  |
Amortized cost | 179,100 | 107,425 |
Gross unrealized gains | 342 | 519 |
Gross unrealized losses | 1,524 | 1,802 |
Estimated fair value | 177,918 | 106,142 |
Residential Mortgage Backed Securities [Member] |  |  |
Amortized cost | 303,822 | 329,606 |
Gross unrealized gains | 374 | 324 |
Gross unrealized losses | 2,670 | 3,691 |
Estimated fair value | 301,526 | 326,239 |
Municipal Bonds [Member] |  |  |
Amortized cost | 61,593 | 94,607 |
Gross unrealized gains | 1,673 | 1,723 |
Gross unrealized losses | 119 | 400 |
Estimated fair value | 63,147 | 95,930 |
Corporate Bonds [Member] |  |  |
Amortized cost | 13,011 | 9,508 |
Gross unrealized gains | 206 | 82 |
Gross unrealized losses |  | 11 |
Estimated fair value | 13,217 | 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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- 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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