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Securities Available-for-Sale - Amortized Cost and Fair Value of Available-for-Sale Securities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 659,629 $ 650,782
Fair Value 683,479 660,963
Obligations of the U.S. Treasury and U.S. government corporations and agencies, and obligations of states and political subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Due in one year or less, Amortized Cost 46,370  
Due after one year through five years, Amortized Cost 211,742  
Due after five years through ten years, Amortized Cost 66,087  
Due after ten years, Amortized Cost 72,406  
Available-for-sale Securities, Debt Maturities, Amortized Cost 396,605  
Due in one year or less, Fair Value 46,509  
Due after one year through five years, Fair Value 217,558  
Due after five years through ten years, Fair Value 69,318  
Due after ten years, Fair Value 78,233  
Fair Value, Debt securities 411,618  
Collateralized Mortgage Obligations of U.S. Government Corporations and Agencies    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 139,532 128,458
Fair Value 143,262 128,835
Residential Mortgage-Backed Securities of U.S. Government Corporations and Agencies    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 36,396 39,185
Fair Value 38,014 40,125
Commercial Mortgage-Backed Securities of U.S. Government Corporations and Agencies    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 79,517 69,697
Fair Value 81,668 69,204
Debt Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 652,050 643,203
Fair Value 674,562 651,294
Marketable Equity Securities    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 7,579 7,579
Fair Value $ 8,917 $ 9,669