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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
Jun. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Total temporarily impaired securities, Less Than 12 Months, Fair Value $ 66,084 $ 260,908
Total temporarily impaired securities, Less Than 12 Months, Unrealized Losses 610 7,466
Total temporarily impaired securities, 12 Months or More, Fair Value 92,069 26,207
Total temporarily impaired securities, 12 Months or More, Unrealized Losses 2,344 1,560
Total temporarily impaired securities, Total, Fair Value 158,153 287,115
Total temporarily impaired securities, Total, Unrealized Losses 2,954 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 12,987 17,454
Total temporarily impaired securities, Less Than 12 Months, Unrealized Losses 87 193
Total temporarily impaired securities, 12 Months or More, Fair Value 11,421 0
Total temporarily impaired securities, 12 Months or More, Unrealized Losses 151 0
Total temporarily impaired securities, Total, Fair Value 24,408 17,454
Total temporarily impaired securities, Total, Unrealized Losses 238 193
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 35,574 0
Total temporarily impaired securities, 12 Months or More, Unrealized Losses 1,395 0
Total temporarily impaired securities, Total, Fair Value 35,574 53,606
Total temporarily impaired securities, Total, Unrealized Losses 1,395 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 11,623 125,468
Total temporarily impaired securities, Less Than 12 Months, Unrealized Losses 25 716
Total temporarily impaired securities, 12 Months or More, Fair Value 10,122 7,447
Total temporarily impaired securities, 12 Months or More, Unrealized Losses 32 9
Total temporarily impaired securities, Total, Fair Value 21,745 132,915
Total temporarily impaired securities, Total, Unrealized Losses 57 725
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 41,474 14,033
Total temporarily impaired securities, Less Than 12 Months, Unrealized Losses 498 220
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 41,474 14,077
Total temporarily impaired securities, Total, Unrealized Losses 498 221
GSE Commercial CMOs [Member]
    
Schedule of Available-for-sale Securities [Line Items]    
Total temporarily impaired securities, Less Than 12 Months, Fair Value 0 38,298
Total temporarily impaired securities, Less Than 12 Months, Unrealized Losses 0 1,248
Total temporarily impaired securities, 12 Months or More, Fair Value 34,952 18,716
Total temporarily impaired securities, 12 Months or More, Unrealized Losses 766 1,550
Total temporarily impaired securities, Total, Fair Value 34,952 57,014
Total temporarily impaired securities, Total, Unrealized Losses $ 766 $ 2,798