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Securities - Amortized Cost and Estimated Fair Value of Securities Available-for-Sale and Held-to-Maturity (Detail) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Securities Financing Transaction [Line Items]    
Debt securities available-for-sale, fair value $ 100,717 $ 81,581
Debt Securites, Held-to-maturity, Amortized Cost 851,903 772,060
Debt Securites, Held-to-maturity, Estimated Fair Value 832,815 761,660
Total, Amortized Cost 953,425 854,438
Total, Gross Unrealized Gains 1,466 1,967
Total, Gross Unrealized Losses (21,359) (13,164)
Total, Estimated Fair Value 933,532 843,241
Corporate Debt Securities    
Securities Financing Transaction [Line Items]    
Debt Securites, Held-to-maturity, Amortized Cost 48,021  
Debt Securites, Held-to-maturity, Estimated Fair Value 43,059  
Held-to-Maturity Securities    
Securities Financing Transaction [Line Items]    
Debt Securites, Held-to-maturity, Amortized Cost 851,903 772,060
Debt Securites, Held-to-maturity, Gross Unrealized Gains 1,303 1,967
Debt Securites, Held-to-maturity, Gross Unrealized Losses (20,391) (12,367)
Debt Securites, Held-to-maturity, Estimated Fair Value 832,815 761,660
Held-to-Maturity Securities | Mortgage-Backed Securities    
Securities Financing Transaction [Line Items]    
Debt Securites, Held-to-maturity, Amortized Cost 646,107 531,110
Debt Securites, Held-to-maturity, Gross Unrealized Gains 1,110 1,436
Debt Securites, Held-to-maturity, Gross Unrealized Losses (13,580) (6,865)
Debt Securites, Held-to-maturity, Estimated Fair Value 633,637 525,681
Held-to-Maturity Securities | Mortgage-Backed Securities | FHLMC    
Securities Financing Transaction [Line Items]    
Debt Securites, Held-to-maturity, Amortized Cost 237,703 186,921
Debt Securites, Held-to-maturity, Gross Unrealized Gains 159 151
Debt Securites, Held-to-maturity, Gross Unrealized Losses (5,110) (2,937)
Debt Securites, Held-to-maturity, Estimated Fair Value 232,752 184,135
Held-to-Maturity Securities | Mortgage-Backed Securities | Mortgage-backed securities - FNMA    
Securities Financing Transaction [Line Items]    
Debt Securites, Held-to-maturity, Amortized Cost 277,266 263,103
Debt Securites, Held-to-maturity, Gross Unrealized Gains 753 1,193
Debt Securites, Held-to-maturity, Gross Unrealized Losses (6,030) (3,000)
Debt Securites, Held-to-maturity, Estimated Fair Value 271,989 261,296
Held-to-Maturity Securities | Mortgage-Backed Securities | GNMA    
Securities Financing Transaction [Line Items]    
Debt Securites, Held-to-maturity, Amortized Cost 127,611 75,243
Debt Securites, Held-to-maturity, Gross Unrealized Gains 198 64
Debt Securites, Held-to-maturity, Gross Unrealized Losses (2,360) (928)
Debt Securites, Held-to-maturity, Estimated Fair Value 125,449 74,379
Held-to-Maturity Securities | Mortgage-Backed Securities | SBA    
Securities Financing Transaction [Line Items]    
Debt Securites, Held-to-maturity, Amortized Cost 3,527 5,843
Debt Securites, Held-to-maturity, Gross Unrealized Gains 0 28
Debt Securites, Held-to-maturity, Gross Unrealized Losses (80) 0
Debt Securites, Held-to-maturity, Estimated Fair Value 3,447 5,871
Investment Securities    
Securities Financing Transaction [Line Items]    
Debt Securites, Available-for-sale, Amortized Cost 101,522  
Debt Securites, Available-for-sale, Gross Unrealized Gains 163  
Debt Securites, Available-for-sale, Gross Unrealized Loss (968)  
Debt securities available-for-sale, fair value 100,717  
Investment Securities | U.S. Agency Obligations    
Securities Financing Transaction [Line Items]    
Debt Securites, Available-for-sale, Amortized Cost 100,524 82,378
Debt Securites, Available-for-sale, Gross Unrealized Gains 163 0
Debt Securites, Available-for-sale, Gross Unrealized Loss (963) (797)
Debt securities available-for-sale, fair value 99,724 81,581
Investment Securities | Other investments    
Securities Financing Transaction [Line Items]    
Debt Securites, Available-for-sale, Amortized Cost 998  
Debt Securites, Available-for-sale, Gross Unrealized Gains 0  
Debt Securites, Available-for-sale, Gross Unrealized Loss (5)  
Debt securities available-for-sale, fair value 993  
Investment Securities | Held-to-Maturity Securities    
Securities Financing Transaction [Line Items]    
Debt Securites, Held-to-maturity, Amortized Cost 205,796 240,950
Debt Securites, Held-to-maturity, Gross Unrealized Gains 193 531
Debt Securites, Held-to-maturity, Gross Unrealized Losses (6,811) (5,502)
Debt Securites, Held-to-maturity, Estimated Fair Value 199,178 235,979
Investment Securities | Held-to-Maturity Securities | U.S. Agency Obligations    
Securities Financing Transaction [Line Items]    
Debt Securites, Held-to-maturity, Amortized Cost 14,975 14,968
Debt Securites, Held-to-maturity, Gross Unrealized Gains 0 0
Debt Securites, Held-to-maturity, Gross Unrealized Losses (130) (65)
Debt Securites, Held-to-maturity, Estimated Fair Value 14,845 14,903
Investment Securities | Held-to-Maturity Securities | State and Municipal Obligations    
Securities Financing Transaction [Line Items]    
Debt Securites, Held-to-maturity, Amortized Cost 123,987 149,958
Debt Securites, Held-to-maturity, Gross Unrealized Gains 67 219
Debt Securites, Held-to-maturity, Gross Unrealized Losses (1,697) (1,475)
Debt Securites, Held-to-maturity, Estimated Fair Value 122,357 148,702
Investment Securities | Held-to-Maturity Securities | Corporate Debt Securities    
Securities Financing Transaction [Line Items]    
Debt Securites, Held-to-maturity, Amortized Cost 66,834 76,024
Debt Securites, Held-to-maturity, Gross Unrealized Gains 126 312
Debt Securites, Held-to-maturity, Gross Unrealized Losses (4,984) (3,962)
Debt Securites, Held-to-maturity, Estimated Fair Value $ 61,976 $ 72,374