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Investment Securities Amortized Cost and Estimated Fair Value of Held to Maturity Securities (Details) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013 | Jun. 30, 2013
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Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | $ 198,135 | $ 169,277 | $ 177,264
Unrealized Gains | 4,315 | 3,264 | 4,161
Unrealized Losses | (6,900) | (14,205) | (6,635)
Fair Value (Estimated) | 195,550 | 158,336 | 174,790
US Treasury and Government [Member] |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 92,324 | 92,280 | 92,179
Unrealized Gains | 5 | 1 | 10
Unrealized Losses | (6,343) | (12,757) | (5,944)
Fair Value (Estimated) | 85,986 | 79,524 | 86,245
Collateralized Mortgage Backed Securities [Member] |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 65,835 | 35,712 | 42,389
Unrealized Gains | 1,851 | 1,440 | 1,883
Unrealized Losses | (526) | (1,336) | (625)
Fair Value (Estimated) | 67,160 | 35,816 | 43,647
US States and Political Subdivisions Debt Securities [Member] |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 39,676 | 40,985 | 42,396
Unrealized Gains | 2,459 | 1,823 | 2,268
Unrealized Losses | (31) | (112) | (66)
Fair Value (Estimated) | 42,104 | 42,696 | 44,598
Corporate Debt Securities [Member] |  |  |
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 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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