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Securities Available for Sale - Gross Unrealized Losses and Fair Value of Company's Available for Sale Securities (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] |  |
Total temporarily impaired securities, Less Than 12 Months, Fair Value | $ 122,494 | $ 260,908
Total temporarily impaired securities, Less Than 12 Months, Unrealized Losses | 962 | 7,466
Total temporarily impaired securities, 12 Months or More, Fair Value | 80,375 | 26,207
Total temporarily impaired securities, 12 Months or More, Unrealized Losses | 2,420 | 1,560
Total temporarily impaired securities, Total, Fair Value | 202,869 | 287,115
Total temporarily impaired securities, Total, Unrealized Losses | 3,382 | 9,026
U.S. Government Agencies [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total temporarily impaired securities, Less Than 12 Months, Fair Value | 3,743 | 17,454
Total temporarily impaired securities, Less Than 12 Months, Unrealized Losses | 5 | 193
Total temporarily impaired securities, 12 Months or More, Fair Value | 15,195 | 0
Total temporarily impaired securities, 12 Months or More, Unrealized Losses | 50 | 0
Total temporarily impaired securities, Total, Fair Value | 18,938 | 17,454
Total temporarily impaired securities, Total, Unrealized Losses | 55 | 193
U.S. government sponsored enterprises (GSE) [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total temporarily impaired securities, Less Than 12 Months, Fair Value |  | 12,049
Total temporarily impaired securities, Less Than 12 Months, Unrealized Losses |  | 722
Total temporarily impaired securities, 12 Months or More, Fair Value |  | 0
Total temporarily impaired securities, 12 Months or More, Unrealized Losses |  | 0
Total temporarily impaired securities, Total, Fair Value |  | 12,049
Total temporarily impaired securities, Total, Unrealized Losses |  | 722
States and Political Subdivisions [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total temporarily impaired securities, Less Than 12 Months, Fair Value | 0 | 53,606
Total temporarily impaired securities, Less Than 12 Months, Unrealized Losses | 0 | 4,367
Total temporarily impaired securities, 12 Months or More, Fair Value | 35,529 | 0
Total temporarily impaired securities, 12 Months or More, Unrealized Losses | 1,370 | 0
Total temporarily impaired securities, Total, Fair Value | 35,529 | 53,606
Total temporarily impaired securities, Total, Unrealized Losses | 1,370 | 4,367
GSE Residential Mortgage-Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total temporarily impaired securities, Less Than 12 Months, Fair Value | 80,161 | 125,468
Total temporarily impaired securities, Less Than 12 Months, Unrealized Losses | 487 | 716
Total temporarily impaired securities, 12 Months or More, Fair Value | 0 | 7,447
Total temporarily impaired securities, 12 Months or More, Unrealized Losses | 0 | 9
Total temporarily impaired securities, Total, Fair Value | 80,161 | 132,915
Total temporarily impaired securities, Total, Unrealized Losses | 487 | 725
GSE Residential Collateralized Mortgage Obligations (CMOs) [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total temporarily impaired securities, Less Than 12 Months, Fair Value | 28,728 | 14,033
Total temporarily impaired securities, Less Than 12 Months, Unrealized Losses | 388 | 220
Total temporarily impaired securities, 12 Months or More, Fair Value | 0 | 44
Total temporarily impaired securities, 12 Months or More, Unrealized Losses | 0 | 1
Total temporarily impaired securities, Total, Fair Value | 28,728 | 14,077
Total temporarily impaired securities, Total, Unrealized Losses | 388 | 221
GSE Commercial CMOs [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Total temporarily impaired securities, Less Than 12 Months, Fair Value | 9,862 | 38,298
Total temporarily impaired securities, Less Than 12 Months, Unrealized Losses | 82 | 1,248
Total temporarily impaired securities, 12 Months or More, Fair Value | 29,651 | 18,716
Total temporarily impaired securities, 12 Months or More, Unrealized Losses | 1,000 | 1,550
Total temporarily impaired securities, Total, Fair Value | 39,513 | 57,014
Total temporarily impaired securities, Total, Unrealized Losses | $ 1,082 | $ 2,798

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- Definition Amount of accumulated pre-tax unrealized loss on securities classified as available-for-sale that have been in a loss position for twelve months or longer recognized in Accumulated Other Comprehensive Income (AOCI). + References No definition available. + Details
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