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Investment Securities - Amortized Cost and Estimated Fair Value of Available for Sale Securities (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016
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Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | $ 300,268 | $ 301,854 | $ 278,126
Unrealized Gains | 1,480 | 1,872 | 4,698
Unrealized Losses | (2,749) | (3,310) | (531)
Fair Value (Estimated) | 298,999 | 300,416 | 282,293
Mortgage-backed securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 290,151 | 282,397 | 258,179
Unrealized Gains | 1,339 | 1,334 | 3,848
Unrealized Losses | (2,701) | (3,127) | (513)
Fair Value (Estimated) | 288,789 | 280,604 | 261,514
State and political subdivisions |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 6,860 | 16,183 | 16,689
Unrealized Gains | 28 | 475 | 795
Unrealized Losses | (46) | (176) | 0
Fair Value (Estimated) | 6,842 | 16,482 | 17,484
Other equity securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 3,257 | 3,274 | 3,258
Unrealized Gains | 113 | 63 | 55
Unrealized Losses | (2) | (7) | (18)
Fair Value (Estimated) | $ 3,368 | $ 3,330 | $ 3,295

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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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