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Investment Securities Amortized Cost and Estimated Fair Value of Held to Maturity Securities (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015 | Mar. 31, 2015
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Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | $ 236,611 | $ 240,023 | $ 262,455
Unrealized Gains | 6,868 | 5,545 | 5,949
Unrealized Losses | (142) | (2,445) | (1,157)
Fair Value (Estimated) | 243,337 | 243,123 | 267,247
U.S. Government-sponsored agencies |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 68,009 | 71,000 | 82,974
Unrealized Gains | 37 | 40 | 108
Unrealized Losses | (107) | (2,284) | (912)
Fair Value (Estimated) | 67,939 | 68,756 | 82,170
Mortgage-backed securities |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 39,828 | 42,193 | 53,228
Unrealized Gains | 1,675 | 1,305 | 2,030
Unrealized Losses | (35) | (136) | (116)
Fair Value (Estimated) | 41,468 | 43,362 | 55,142
State and political subdivisions |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 124,474 | 122,530 | 125,953
Unrealized Gains | 5,156 | 4,200 | 3,811
Unrealized Losses | 0 | (25) | (129)
Fair Value (Estimated) | 129,630 | 126,705 | 129,635
Corporate securities |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 4,300 | 4,300 | 300
Unrealized Gains | 0 | 0 | 0
Unrealized Losses | 0 | 0 | 0
Fair Value (Estimated) | $ 4,300 | $ 4,300 | $ 300

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- Definition Amount of accumulated unrealized gain on investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 + Details
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- Definition Amount of accumulated unrealized loss on investments in debt securities classified as held-to-maturity. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 + Details
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- Definition Fair value of investments in debt securities classified as held-to-maturity. + References Reference 1: 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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (f) -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 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 + Details
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