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Investment Securities (Narrative) (Detail)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
USD ($)
security
position
Sep. 30, 2017
USD ($)
Sep. 30, 2018
USD ($)
security
position
Sep. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
security
position
Schedule of Held-to-maturity Securities [Line Items]          
Available for sale debt securities, at fair value $ 1,042,320   $ 1,042,320   $ 1,037,154
Securities held to maturity, at fair value $ 474,092   $ 474,092   $ 477,652
Total number of all held to maturity and available for sale securities in an unrealized loss position | security 689   689   306
Securities available for sale, amortized cost $ 1,071,352   $ 1,071,352   $ 1,041,868
Securities available for sale, number of securities in an unrealized loss position | position 209   209   122
Held to maturity securities, proceeds from calls $ 10,400 $ 8,100 $ 30,900 $ 28,700  
Held to maturity securities, recognized gain on calls 3 39 4 50  
Held to maturity securities, recognized loss on calls 1 $ 3 1 $ 3  
Investment securities held to maturity, fair value $ 469,861   $ 469,861   $ 485,039
Number of securities in an unrealized loss position | security 480   480   184
Private Label Mortgage-Backed Securities [Member]          
Schedule of Held-to-maturity Securities [Line Items]          
Securities available for sale, amortized cost $ 34   $ 34    
Securities available for sale, number of securities in an unrealized loss position | position 1   1    
Unrealized losses     $ 1    
Mortgage-Backed Securities [Member]          
Schedule of Held-to-maturity Securities [Line Items]          
Available for sale debt securities, at fair value $ 1,014,171   1,014,171   $ 988,367
Securities held to maturity, at fair value 207   207   382
Securities available for sale, amortized cost 1,043,084   1,043,084   993,548
Held-to-maturity securities, amortized cost 207   207    
Investment securities held to maturity, fair value $ 214   $ 214   $ 396