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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
Dec. 31, 2013
Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]    
Total temporarily impaired securities, Less Than 12 Months, Fair Value $ 260,908 $ 86,233
Total temporarily impaired securities, Less Than 12 Months, Unrealized Losses 7,466 376
Total temporarily impaired securities, 12 Months or More, Fair Value 26,207 2,657
Total temporarily impaired securities, 12 Months or More, Unrealized Losses 1,560 21
Total temporarily impaired securities, Total, Fair Value 287,115 88,890
Total temporarily impaired securities, Total, Unrealized Losses 9,026 397
U.S. Government Agencies [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Total temporarily impaired securities, Less Than 12 Months, Fair Value 17,454  
Total temporarily impaired securities, Less Than 12 Months, Unrealized Losses 193  
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 17,454  
Total temporarily impaired securities, Total, Unrealized Losses 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 53,606 885
Total temporarily impaired securities, Less Than 12 Months, Unrealized Losses 4,367 3
Total temporarily impaired securities, 12 Months or More, Fair Value 0 0
Total temporarily impaired securities, 12 Months or More, Unrealized Losses 0 0
Total temporarily impaired securities, Total, Fair Value 53,606 885
Total temporarily impaired securities, Total, Unrealized Losses 4,367 3
GSE Residential Mortgage-backed Securities [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Total temporarily impaired securities, Less Than 12 Months, Fair Value 125,468 51,491
Total temporarily impaired securities, Less Than 12 Months, Unrealized Losses 716 285
Total temporarily impaired securities, 12 Months or More, Fair Value 7,447 0
Total temporarily impaired securities, 12 Months or More, Unrealized Losses 9 0
Total temporarily impaired securities, Total, Fair Value 132,915 51,491
Total temporarily impaired securities, Total, Unrealized Losses 725 285
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 14,033 13,461
Total temporarily impaired securities, Less Than 12 Months, Unrealized Losses 220 27
Total temporarily impaired securities, 12 Months or More, Fair Value 44 2,657
Total temporarily impaired securities, 12 Months or More, Unrealized Losses 1 21
Total temporarily impaired securities, Total, Fair Value 14,077 16,118
Total temporarily impaired securities, Total, Unrealized Losses 221 48
GSE Commercial CMOs [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Total temporarily impaired securities, Less Than 12 Months, Fair Value 38,298 20,396
Total temporarily impaired securities, Less Than 12 Months, Unrealized Losses 1,248 61
Total temporarily impaired securities, 12 Months or More, Fair Value 18,716 0
Total temporarily impaired securities, 12 Months or More, Unrealized Losses 1,550 0
Total temporarily impaired securities, Total, Fair Value 57,014 20,396
Total temporarily impaired securities, Total, Unrealized Losses $ 2,798 $ 61