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Securities Available for Sale - Amortized Cost and Fair Values of Investment Securities Available for Sale (Detail) (USD $) In Thousands, unless otherwise specified | Jun. 30, 2014 | Dec. 31, 2013
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Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale equity securities - financial services, Amortized Cost | $ 50 | $ 50
Available for sale securities, Gross Unrealized Gains | 19 | 19
Available for sale securities, Gross Unrealized Losses | 0 | 0
Available for sale securities, equity securities - financial services, Fair Value | 69 | 69
Available for sale debt securities, Amortized Cost | 387,934 | 414,298
Available for sale securities, Gross Unrealized Gains | 4,912 | 1,602
Available for sale securities, Gross Unrealized Losses | 2,954 | 9,026
Available for sale securities, debt securities, Fair Value | 389,892 | 406,874
Available for sale securities, Total | 387,984 | 414,348
Available for sale securities, Gross Unrealized Gains | 4,931 | 1,621
Available for sale securities, Gross Unrealized Losses | 2,954 | 9,026
Available for sale securities, Total | 389,961 | 406,943
U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale debt securities, Amortized Cost | 24,646 | 25,610
Available for sale securities, Gross Unrealized Gains | 0 | 34
Available for sale securities, Gross Unrealized Losses | 238 | 193
Available for sale securities, debt securities, Fair Value | 24,408 | 25,451
U.S. Government Sponsored Enterprises (GSE) [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale debt securities, Amortized Cost | 1,464 | 14,431
Available for sale securities, Gross Unrealized Gains | 0 | 5
Available for sale securities, Gross Unrealized Losses | 0 | 722
Available for sale securities, debt securities, Fair Value | 1,464 | 13,714
States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale debt securities, Amortized Cost | 53,538 | 75,494
Available for sale securities, Gross Unrealized Gains | 690 | 417
Available for sale securities, Gross Unrealized Losses | 1,395 | 4,367
Available for sale securities, debt securities, Fair Value | 52,833 | 71,544
GSE Residential Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale debt securities, Amortized Cost | 154,773 | 198,449
Available for sale securities, Gross Unrealized Gains | 2,629 | 895
Available for sale securities, Gross Unrealized Losses | 57 | 725
Available for sale securities, debt securities, Fair Value | 157,345 | 198,619
GSE Residential Collateralized Mortgage Obligations (CMOs) [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale debt securities, Amortized Cost | 88,240 | 40,502
Available for sale securities, Gross Unrealized Gains | 885 | 251
Available for sale securities, Gross Unrealized Losses | 498 | 221
Available for sale securities, debt securities, Fair Value | 88,627 | 40,532
GSE Commercial CMOs [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Available for sale debt securities, Amortized Cost | 65,273 | 59,812
Available for sale securities, Gross Unrealized Gains | 708 | 0
Available for sale securities, Gross Unrealized Losses | 766 | 2,798
Available for sale securities, debt securities, Fair Value | $ 65,215 | $ 57,014

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- Definition Amount of accumulated pre-tax unrealized gains before deducting pre-tax unrealized losses on investments in available-for-sale securities impacting investments. + References No definition available. + Details
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- Definition Amount of accumulated pre-tax unrealized loss before deducting pre-tax unrealized gain on investments in available-for-sale debt securities impacting investments. + References No definition available. + Details
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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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