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Securities - Fair Value of Securities (Detail) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2014
Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]    
Total available for sale investment securities, Amortized Cost $ 321,203 $ 508,427
Held-to-maturity, Amortized Cost 172,449 9,910
Gross Unrealized Gains 5,396 9,015
Held-to-maturity, Gross Unrealized Gains 3,415  
Gross Unrealized Losses (3,107) (8,851)
Held-to-maturity, Gross Unrealized Losses (26)  
Available-for-sale Securities, Fair Value 323,492 508,591
Held-to-maturity, Fair Value 175,838 9,910
U.S. Treasury and Federal Agencies [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Total available for sale investment securities, Amortized Cost 27,093 43,808
Held-to-maturity, Amortized Cost 9,783  
Gross Unrealized Gains 67 133
Held-to-maturity, Gross Unrealized Gains 49  
Gross Unrealized Losses (335) (807)
Held-to-maturity, Gross Unrealized Losses (4)  
Available-for-sale Securities, Fair Value 26,825 43,134
Held-to-maturity, Fair Value 9,828  
State and Municipal [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Total available for sale investment securities, Amortized Cost 47,006 176,670
Held-to-maturity, Amortized Cost 135,839 9,910
Gross Unrealized Gains 1,641 4,405
Held-to-maturity, Gross Unrealized Gains 2,958   
Gross Unrealized Losses (52) (3,177)
Held-to-maturity, Gross Unrealized Losses (22)  
Available-for-sale Securities, Fair Value 48,595 177,898
Held-to-maturity, Fair Value 138,775 9,910
Federal Agency Collateralized Mortgage Obligations [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Total available for sale investment securities, Amortized Cost 123,916 116,047
Held-to-maturity, Amortized Cost 4,193  
Gross Unrealized Gains 970 1,242
Held-to-maturity, Gross Unrealized Gains 9  
Gross Unrealized Losses (1,758) (2,583)
Available-for-sale Securities, Fair Value 123,128 114,706
Held-to-maturity, Fair Value 4,202  
Federal Agency Mortgage-backed Pools [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Total available for sale investment securities, Amortized Cost 122,393 170,006
Held-to-maturity, Amortized Cost 22,634  
Gross Unrealized Gains 2,678 3,172
Held-to-maturity, Gross Unrealized Gains 399  
Gross Unrealized Losses (962) (2,284)
Available-for-sale Securities, Fair Value 124,109 170,894
Held-to-maturity, Fair Value 23,033  
Private Labeled Mortgage-backed Pools [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Total available for sale investment securities, Amortized Cost 763 1,188
Gross Unrealized Gains 23 38
Available-for-sale Securities, Fair Value 786 1,226
Corporate Notes [Member]
   
Schedule of Available-for-sale Securities [Line Items]    
Total available for sale investment securities, Amortized Cost 32 708
Gross Unrealized Gains 17 25
Available-for-sale Securities, Fair Value $ 49 $ 733