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Investment Securities Amortized Cost and Estimated Fair Value of Held to Maturity Securities (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2013
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | $ 182,853 | $ 150,791 | $ 169,277
Unrealized Gains | 3,724 | 6,273 | 3,264
Unrealized Losses | (10,015) | (512) | (14,205)
Fair Value (Estimated) | 176,562 | 156,552 | 158,336
US Treasury and Government [Member] |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 92,312 | 60,940 | 92,280
Unrealized Gains | 2 | 79 | 1
Unrealized Losses | (9,131) | (289) | (12,757)
Fair Value (Estimated) | 83,183 | 60,730 | 79,524
Collateralized Mortgage Backed Securities [Member] |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 49,805 | 46,604 | 35,712
Unrealized Gains | 1,652 | 2,634 | 1,440
Unrealized Losses | (789) | (218) | (1,336)
Fair Value (Estimated) | 50,668 | 49,020 | 35,816
US States and Political Subdivisions Debt Securities [Member] |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |
Amortized Cost | 40,436 | 42,947 | 40,985
Unrealized Gains | 2,070 | 3,560 | 1,823
Unrealized Losses | (95) | (5) | (112)
Fair Value (Estimated) | 42,411 | 46,502 | 42,696
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 Amount before other than temporary impairment (OTTI) accretion, of investments in debt securities classified as held-to-maturity. + References No definition available. + 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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- Definition Amount of unrecognized gain before loss on investments in held-to-maturity securities. + 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 unrecognized loss before gain on investments in held-to-maturity securities. Excludes write-down for other than temporary impairment (OTTI). + 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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