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Investment Securities (Securities Available for Sale) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost $ 1,025,030 $ 1,041,247
Gross unrealized gains 8,225 7,558
Gross unrealized losses (4,950) (8,419)
Fair value 1,028,305 1,040,386
U.S. Treasury Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 5,995 7,995
Gross unrealized gains 0 13
Gross unrealized losses (1) 0
Fair value 5,994 8,008
Agency Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 28,031 57,123
Gross unrealized gains 15 90
Gross unrealized losses (11) (25)
Fair value 28,035 57,188
Mortgage-Backed Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 965,863 952,992
Gross unrealized gains 7,477 7,249
Gross unrealized losses (4,928) (8,380)
Fair value 968,412 951,861
State And Municipal Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 3,695 3,727
Gross unrealized gains 112 19
Gross unrealized losses 0 (3)
Fair value 3,807 3,743
Corporate Obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 21,049 19,013
Gross unrealized gains 420 35
Gross unrealized losses (10) (11)
Fair value 21,459 19,037
Equity Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Amortized cost 397 397
Gross unrealized gains 201 152
Gross unrealized losses 0 0
Fair value $ 598 $ 549