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Securities - Amortized Cost and Fair Value of Securities with Gross Unrealized Gains and Losses (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 243,056 | $ 247,819
Gross Unrealized Gains | 2,167 | 2,619
Gross Unrealized Losses | (437) | (1,946)
Fair Value | 244,786 | 248,492
U.S. Treasury [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 38,861 | 25,833
Gross Unrealized Gains | 124 |
Gross Unrealized Losses | (81) | (440)
Fair Value | 38,904 | 25,393
U.S. Government Agency [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 100,798 | 120,154
Gross Unrealized Gains | 215 | 391
Gross Unrealized Losses | (209) | (1,311)
Fair Value | 100,804 | 119,234
Mortgage-backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 27,593 | 29,067
Gross Unrealized Gains | 472 | 557
Gross Unrealized Losses | (37) | (62)
Fair Value | 28,028 | 29,562
State and Local Governments [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 75,804 | 72,765
Gross Unrealized Gains | 1,356 | 1,671
Gross Unrealized Losses | (110) | (133)
Fair Value | $ 77,050 | $ 74,303

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + 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 before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt securities classified as available-for-sale. + 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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- Definition This item represents the cost of debt 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 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27161-111563 Reference 2: 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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