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Investment Securities - Amortized Cost and Estimated Fair Value of Available for Sale Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016 | Jun. 30, 2016
--- | --- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | $ 309,046 | $ 301,854 | $ 235,174
Unrealized Gains | 1,932 | 1,872 | 6,422
Unrealized Losses | (2,832) | (3,310) | (269)
Fair Value (Estimated) | 308,146 | 300,416 | 241,327
U.S. Government-sponsored agencies |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost |  |  | 522
Unrealized Gains |  |  | 0
Unrealized Losses |  |  | 0
Fair Value (Estimated) |  |  | 522
Mortgage-backed securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 290,379 | 282,397 | 214,303
Unrealized Gains | 1,381 | 1,334 | 5,274
Unrealized Losses | (2,769) | (3,127) | (224)
Fair Value (Estimated) | 288,991 | 280,604 | 219,353
State and political subdivisions |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 15,401 | 16,183 | 17,315
Unrealized Gains | 486 | 475 | 1,100
Unrealized Losses | (59) | (176) | 0
Fair Value (Estimated) | 15,828 | 16,482 | 18,415
Other equity securities |  |  |
Schedule of Available-for-sale Securities [Line Items] |  |  |
Amortized Cost | 3,266 | 3,274 | 3,034
Unrealized Gains | 65 | 63 | 48
Unrealized Losses | (4) | (7) | (45)
Fair Value (Estimated) | $ 3,327 | $ 3,330 | $ 3,037

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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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