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Amortized Cost and Estimated Fair Value of Investment Securities Available for Sale (Detail) (USD $) In Thousands, unless otherwise specified | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2013 | Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 393,501 | $ 373,865
Gross Unrealized Gains | 5,136 | 7,488
Gross Unrealized Losses | (5,061) | (1,165)
Estimated Fair Value | 393,576 | 380,188
U.S. Government agencies |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 4,363 | 2,987
Gross Unrealized Gains | 4 | 3
Gross Unrealized Losses | (74) | (17)
Estimated Fair Value | 4,293 | 2,973
Obligations of State and Political Subdivisions |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 87,237 | 70,736
Gross Unrealized Gains | 2,138 | 3,430
Gross Unrealized Losses | (1,970) | (180)
Estimated Fair Value | 87,405 | 73,986
U.S. Government agencies collateralized by mortgage obligations |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 300,565 | 298,806
Gross Unrealized Gains | 2,096 | 3,547
Gross Unrealized Losses | (3,017) | (964)
Estimated Fair Value | 299,644 | 301,389
Equity Securities |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 1,336 | 1,336
Gross Unrealized Gains | 898 | 508
Gross Unrealized Losses | 0 | (4)
Estimated Fair Value | $ 2,234 | $ 1,840

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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=28360136&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=27724398&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=6871852&loc=d3e26610-111562 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition Amount of unrealized gain before deducting unrealized loss on investments in debt and equity securities classified as available-for-sale securities. + 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=27724398&loc=d3e27161-111563 + Details
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- Definition Amount of unrealized loss before deducting unrealized gain on investments in available-for-sale securities. + 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 (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 + Details
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