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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 | Sep. 30, 2014 | Dec. 31, 2013
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Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | $ 402,431 |
Fair Value | 402,500 |
Equity securities, Amortized Cost | 50 |
Equity securities, Fair Value | 63 |
Available for sale securities, Total | 402,481 | 414,348
Available for sale securities, Gross Unrealized Gains | 3,464 | 1,621
Available for sale securities, Gross Unrealized Losses | 3,382 | 9,026
Securities available for sale | 402,563 | 406,943
Debt Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 402,431 | 414,298
Gross Unrealized Gains | 3,451 | 1,602
Gross Unrealized Losses | 3,382 | 9,026
Fair Value | 402,500 | 406,874
Debt Securities [Member] | U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 24,216 | 25,610
Gross Unrealized Gains | 15 | 34
Gross Unrealized Losses | 55 | 193
Fair Value | 24,176 | 25,451
Debt Securities [Member] | U.S. government sponsored enterprises (GSE) [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost |  | 14,431
Gross Unrealized Gains |  | 5
Gross Unrealized Losses |  | 722
Fair Value |  | 13,714
Debt Securities [Member] | States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 52,658 | 75,494
Gross Unrealized Gains | 726 | 417
Gross Unrealized Losses | 1,370 | 4,367
Fair Value | 52,014 | 71,544
Debt Securities [Member] | GSE Residential Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 178,817 | 198,449
Gross Unrealized Gains | 1,456 | 895
Gross Unrealized Losses | 487 | 725
Fair Value | 179,786 | 198,619
Debt Securities [Member] | GSE Residential Collateralized Mortgage Obligations (CMOs) [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 81,584 | 40,502
Gross Unrealized Gains | 788 | 251
Gross Unrealized Losses | 388 | 221
Fair Value | 81,984 | 40,532
Debt Securities [Member] | GSE Commercial CMOs [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized Cost | 65,156 | 59,812
Gross Unrealized Gains | 466 | 0
Gross Unrealized Losses | 1,082 | 2,798
Fair Value | 64,540 | 57,014
Equity Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Equity securities, Amortized Cost | 50 | 50
Equity securities, Gross Unrealized Gains | 13 | 19
Equity securities, Gross Unrealized Losses | 0 | 0
Equity securities, Fair Value | $ 63 | $ 69

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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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