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Amortized Cost and Aggregate Fair Value of Available-for-Sale and Held-to-Maturity Securities (Detail) - USD ($) $ in Thousands | Sep. 30, 2015 | Dec. 31, 2014
--- | --- | ---
Available-for-sale securities |  |
Due within one year, Amortized Cost | $ 56,044 |
Due after one year but within five years, Amortized Cost | 20,108 |
Due after five years but within ten years, Amortized Cost | 75,932 |
Due after ten years, Amortized Cost | 134,459 |
Amortized Cost | 386,197 | $ 332,942
Held-to-maturity securities |  |
Due within one year, Amortized Cost | 190 |
Due after one year but within five years, Amortized Cost | 72,406 |
Due after five years but within ten years, Amortized Cost | 0 |
Due after ten years, Amortized Cost | 0 |
Amortized Cost | 72,596 | 57,948
Available-for-sale securities |  |
Due within one year, Fair Value | 55,956 |
Due after one year but within five years, Fair Value | 20,137 |
Due after five years but within ten years, Fair Value | 78,955 |
Due after ten years, Fair Value | 127,804 |
Fair Value | 382,212 | 326,117
Held-to-maturity securities |  |
Due within one year, Fair Value | 191 |
Due after one year but within five years, Fair Value | 72,839 |
Due after five years but within ten years, Fair Value | 0 |
Due after ten years, Fair Value | 0 |
Fair Value | 73,030 | 57,889
Debt Securities |  |
Available-for-sale securities |  |
Amortized Cost | 286,543 |
Available-for-sale securities |  |
Fair Value | 282,852 |
Total Mortgage Backed Securities |  |
Available-for-sale securities |  |
Amortized Cost | 94,432 |
Available-for-sale securities |  |
Fair Value | 94,125 |
Equity Securities |  |
Available-for-sale securities |  |
Amortized Cost | 222 | 226
Available-for-sale securities |  |
Fair Value | 235 | $ 239
Certificates of deposit |  |
Available-for-sale securities |  |
Amortized Cost | 5,000 |
Available-for-sale securities |  |
Fair Value | $ 5,000 |

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- Definition Amount after adjustments of available-for-sale debt securities at cost, maturing in the sixth fiscal year through the tenth fiscal year following the latest fiscal year. Adjustments include, but are not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized in earnings less cumulative-effect adjustments, and fair value hedge accounting adjustments. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + 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 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27198-111563 + Details
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