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Investment Securities Amortized Cost and Estimated Fair Value of Held to Maturity Securities (Details) - USD ($) $ in Thousands | Jun. 30, 2015 | Dec. 31, 2014 | Jun. 30, 2014
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Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | $ 249,250 | $ 275,919 | $ 198,135
Unrealized Gains | 3,671 | 5,998 | 4,315
Unrealized Losses | (4,223) | (2,213) | (6,900)
Fair Value (Estimated) | 248,698 | 279,704 | 195,550
U.S. Government-sponsored agencies |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 75,982 | 92,341 | 92,324
Unrealized Gains | 45 | 54 | 5
Unrealized Losses | (3,035) | (2,066) | (6,343)
Fair Value (Estimated) | 72,992 | 90,329 | 85,986
Mortgage-backed securities |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 48,655 | 57,003 | 65,835
Unrealized Gains | 1,650 | 1,830 | 1,851
Unrealized Losses | (125) | (116) | (526)
Fair Value (Estimated) | 50,180 | 58,717 | 67,160
State and political subdivisions |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 124,313 | 126,275 | 39,676
Unrealized Gains | 1,976 | 4,114 | 2,459
Unrealized Losses | (1,063) | (31) | (31)
Fair Value (Estimated) | 125,226 | 130,358 | 42,104
Corporate securities |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 300 | 300 | 300
Unrealized Gains | 0 | 0 | 0
Unrealized Losses | 0 | 0 | 0
Fair Value (Estimated) | $ 300 | $ 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=27724398&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=27724398&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=27724398&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=27724398&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=27724398&loc=d3e27232-111563 + Details
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