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Investment Securities - Amortized Cost, Gross Unrealized Gains and Losses and Fair Value of Investment Securities Available for Sale (Detail) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost $ 1,516,937 $ 889,958
Gross Unrealized Gains 6,236 9,343
Gross Unrealized Losses (16,312) (12,331)
Available for sale 1,506,861 886,970
U.S. Treasury securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 551,173 51,063
Gross Unrealized Gains 4 2
Gross Unrealized Losses (1,704) (1,622)
Available for sale 549,473 49,443
U.S. government agency securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 29,316 33,163
Gross Unrealized Gains 665 748
Gross Unrealized Losses (18) (86)
Available for sale 29,963 33,825
Obligations of states and state agencies [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 44,285 11,160
Gross Unrealized Gains 196 0
Gross Unrealized Losses (67) (24)
Available for sale 44,414 11,136
Municipal bonds [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 80,717 33,340
Gross Unrealized Gains 209 127
Gross Unrealized Losses (374) (552)
Available for sale 80,552 32,915
Obligations of states and political subdivisions [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 125,002 44,500
Gross Unrealized Gains 405 127
Gross Unrealized Losses (441) (576)
Available for sale 124,966 44,051
Residential mortgage-backed securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 701,764 643,382
Gross Unrealized Gains 3,348 5,854
Gross Unrealized Losses (8,684) (4,960)
Available for sale 696,428 644,276
Trust preferred securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost [1] 10,458 23,194
Gross Unrealized Gains [1] 0 296
Gross Unrealized Losses [1] (2,054) (2,953)
Available for sale [1] 8,404 20,537
Corporate and other debt securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 78,202 73,585
Gross Unrealized Gains 1,239 1,645
Gross Unrealized Losses (1,889) (1,218)
Available for sale 77,552 74,012
Equity securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 21,022 21,071
Gross Unrealized Gains 575 671
Gross Unrealized Losses (1,522) (916)
Available for sale $ 20,075 $ 20,826
[1] Includes two and three pooled trust preferred securities, principally collateralized by securities issued by banks and insurance companies, at December 31, 2015 and 2014, respectively.