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Investment Securities (Narrative) (Detail)
3 Months Ended
Mar. 31, 2019
USD ($)
security
position
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
security
position
Schedule of Held-to-maturity Securities [Line Items]      
Available for sale debt securities, at fair value $ 1,083,601,000   $ 1,063,079,000
Securities held to maturity, at fair value $ 472,039,000   $ 479,425,000
Total number of all held to maturity and available for sale securities in an unrealized loss position | security 260   509
Securities available for sale, amortized cost $ 1,086,386,000   $ 1,076,282,000
Securities available for sale, number of securities in an unrealized loss position | position 130   175
Held to maturity securities, proceeds from calls $ 9,300,000 $ 20,300,000  
Held to maturity securities, recognized gain on calls 0 1,000  
Held to maturity securities, recognized loss on calls 0 $ 0  
Investment securities held to maturity, fair value $ 479,827,000   $ 479,740,000
Number of securities in an unrealized loss position | security 130   334
Private Label Mortgage-Backed Securities [Member]      
Schedule of Held-to-maturity Securities [Line Items]      
Securities available for sale, amortized cost $ 24,000    
Securities available for sale, number of securities in an unrealized loss position | position 1    
Unrealized losses $ 2,000    
Mortgage-Backed Securities [Member]      
Schedule of Held-to-maturity Securities [Line Items]      
Available for sale debt securities, at fair value 1,054,482,000   $ 1,034,969,000
Securities held to maturity, at fair value 170,000   187,000
Securities available for sale, amortized cost 1,057,405,000   1,048,415,000
Held-to-maturity securities, amortized cost 170,000    
Investment securities held to maturity, fair value $ 173,000   $ 190,000