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Securities - Securities Available for Sale (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost $ 540,614 $ 681,510
Unrealized Gains 12,411 12,714
Unrealized Losses (6,982) (8,504)
Fair Value 546,043 685,720
U.S. Government Sponsored Entities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 141,300 155,482
Unrealized Gains 1,579 2,301
Unrealized Losses (1,128) (2,219)
Fair Value 141,751 155,564
States and Political Subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 165,828 174,600
Unrealized Gains 6,234 6,804
Unrealized Losses (243) (402)
Fair Value 171,819 181,002
Residential and Multi-Family Mortgage [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 160,316 265,678
Unrealized Gains 1,060 2,291
Unrealized Losses (3,394) (2,805)
Fair Value 157,982 265,164
Corporate Notes and Bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 19,794 20,791
Unrealized Gains 165 139
Unrealized Losses (1,271) (1,500)
Fair Value 18,688 19,430
Pooled Trust Preferred [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 800 800
Unrealized Gains 2,613 105
Unrealized Losses 0 0
Fair Value 3,413 905
Pooled SBA [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 51,556 63,139
Unrealized Gains 760 1,074
Unrealized Losses (907) (1,560)
Fair Value 51,409 62,653
Other Equity Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized Cost 1,020 1,020
Unrealized Gains 0 0
Unrealized Losses (39) (18)
Fair Value $ 981 $ 1,002