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Amortized Cost, Fair Value, and Weighted-Average Yield of Securities by Contractual Maturity (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended |
--- | --- | ---
Dec. 31, 2013 | Dec. 31, 2012
Available-for-Sale |  |  |
Due within one year, Amortized cost | $ 1,386 |  |
Due after one year but within five years, Amortized cost | 14,227 |  |
Due after five years but within ten years, Amortized cost | 196,906 |  |
Due after ten years, Amortized cost | 5,002 |  |
Amortized cost | 541,642 |  |
Amortized Cost | 541,642 |  | 534,810
Tax equivalent purchase yield | 3.01% |  |
Average contractual maturity (in years) | 11 years 3 months |  |
Due within one year, Fair value | 1,393 |  |
Due after one year but within five years, Fair value | 14,557 |  |
Due after five years but within ten years, Fair value | 184,474 |  |
Due after ten years, Fair value | 3,974 |  |
Fair Value | 519,820 |  | 534,358
Due within one year, tax equivalent purchase yield | 3.85% | [1] |
Due after one year through five years, tax equivalent purchase yield | 5.69% | [1] |
Due after five years through ten years, tax equivalent purchase yield | 3.63% | [1] |
Due after ten years, tax equivalent purchase yield | 1.15% | [1] |
Held-to-Maturity |  |  |
Total amortized cost | 568 |  | 816
Fair Value | 579 |  | 832
Due within one year, tax equivalent purchase yield | 8.05% | [1] |
Due after one year through five years, tax equivalent purchase yield | 8.17% | [1] |
Due after five years through ten years, tax equivalent purchase yield |  | [1] |
Due after ten years, tax equivalent purchase yield |  | [1] |
US Treasury Securities |  |  |
Available-for-Sale |  |  |
Due after five years but within ten years, Amortized cost | 9,708 |  |
Tax equivalent purchase yield | 2.09% |  |
Average contractual maturity (in years) | 9 years 4 months 17 days |  |
Due after five years but within ten years, Fair value | 9,013 |  |
Municipal securities |  |  |
Available-for-Sale |  |  |
Due within one year, Amortized cost | 1,386 |  |
Due after one year but within five years, Amortized cost | 14,227 |  |
Due after five years but within ten years, Amortized cost | 131,436 |  |
Tax equivalent purchase yield | 4.76% |  |
Average contractual maturity (in years) | 10 years 5 months 1 day |  |
Due within one year, Fair value | 1,393 |  |
Due after one year but within five years, Fair value | 14,557 |  |
Due after five years but within ten years, Fair value | 128,330 |  |
Held-to-Maturity |  |  |
Due within one year, Amortized cost | 190 |  |
Due after one year but within five years, Amortized cost | 378 |  |
Due after five years but within ten years, Amortized cost |  |  |
Due after ten years, Amortized cost |  |  |
Total amortized cost | 568 |  |
Tax equivalent purchase yield | 8.13% |  |
Average contractual maturity (in years) | 1 year 3 months 29 days |  |
Due within one year, Fair value | 193 |  |
Due after one year but within five years, Fair value | 386 |  |
Due after five years but within ten years, Fair value |  |  |
Due after ten years, Fair value |  |  |
Fair Value | 579 |  |
Corporate securities |  |  |
Available-for-Sale |  |  |
Due after five years but within ten years, Amortized cost | 55,762 |  |
Due after ten years, Amortized cost | 5,002 |  |
Tax equivalent purchase yield | 1.34% |  |
Average contractual maturity (in years) | 13 years 6 months 18 days |  |
Due after five years but within ten years, Fair value | 47,131 |  |
Due after ten years, Fair value | 3,974 |  |
Total Mortgage Backed Securities |  |  |
Available-for-Sale |  |  |
Amortized Cost | 318,862 |  | 324,538
Tax equivalent purchase yield | 2.50% | [1] |
Fair Value | 310,175 |  | 326,964
Equity Securities |  |  |
Available-for-Sale |  |  |
Amortized Cost | 5,259 |  | 3,446
Tax equivalent purchase yield | 4.92% | [1] |
Fair Value | 5,247 |  | 3,531
Debt Securities |  |  |
Available-for-Sale |  |  |
Amortized cost | 217,521 |  |
Fair Value | 204,398 |  |
Debt Securities | US Treasury Securities |  |  |
Available-for-Sale |  |  |
Amortized cost | 9,708 |  |
Fair Value | 9,013 |  |
Debt Securities | Municipal securities |  |  |
Available-for-Sale |  |  |
Amortized cost | 147,049 |  |
Fair Value | 144,280 |  |
Debt Securities | Corporate securities |  |  |
Available-for-Sale |  |  |
Amortized cost | 60,764 |  |
Fair Value | $ 51,105 |  |
[1] | Fully taxable equivalent at the rate of 35%.

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- Definition Carrying amount of debt securities accounted for as held-to-maturity, net of adjustments including, but not limited to, accretion, amortization, collection of cash, previous other-than-temporary impairments (OTTI) recognized, and fair value hedge accounting adjustments, maturing after the tenth fiscal year following the latest fiscal year. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 320 -Section 50 -Paragraph 3 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=6957658&loc=d3e62586-112803 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)(4) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 + 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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