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Investments (Schedule of Available-for-sale Securities Reconciliation) (Details) - USD ($) $ in Thousands | Jun. 30, 2016 | Dec. 31, 2015
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 519,744 | $ 503,152
Gross Unrealized Gains | 9,490 | 6,610
Gross Unrealized Losses | (695) | (2,180)
Estimated Fair Value | 528,539 | 507,582
US Government agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 24,466 | 28,801
Gross Unrealized Gains | 409 | 303
Gross Unrealized Losses | (3) | (62)
Estimated Fair Value | 24,872 | 29,042
Mortgage-backed securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 391,345 | 374,683
Gross Unrealized Gains | 3,951 | 2,440
Gross Unrealized Losses | (682) | (2,062)
Estimated Fair Value | 394,614 | 375,061
State and poltical subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 103,433 | 99,093
Gross Unrealized Gains | 4,503 | 3,146
Gross Unrealized Losses | (10) | (56)
Estimated Fair Value | 107,926 | 102,183
Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 500 | 575
Gross Unrealized Gains | 627 | 721
Gross Unrealized Losses | 0 | 0
Estimated Fair Value | $ 1,127 | $ 1,296

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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=65884222&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=73527792&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=66010992&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=73527792&loc=d3e27161-111563 + Details
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