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Impairment of Investment Securities - Schedule of Unrealized Losses and Estimated Fair Values (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Schedule Of Unrealized Losses On Securities [Line Items]    
Estimated Fair Value, Less Than 12 Months $ 431,247 $ 773,932
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses (3,386) (13,175)
Estimated Fair Value, 12 Months or More 456,539 85,152
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses (15,148) (9,326)
Total Estimated Fair Value 887,786 859,084
Total Gross Unrealized Losses (18,534) (22,501)
Corporate Securities [Member]    
Schedule Of Unrealized Losses On Securities [Line Items]    
Estimated Fair Value, Less Than 12 Months 3,993  
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses (4)  
Estimated Fair Value, 12 Months or More 0  
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses 0  
Total Estimated Fair Value 3,993  
Total Gross Unrealized Losses (4)  
Pooled Trust Preferred Collateralized Debt Obligations [Member]    
Schedule Of Unrealized Losses On Securities [Line Items]    
Estimated Fair Value, Less Than 12 Months 0 0
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses 0 0
Estimated Fair Value, 12 Months or More 19,120 28,952
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses (4,379) (7,124)
Total Estimated Fair Value 19,120 28,952
Total Gross Unrealized Losses (4,379) (7,124)
Obligations of U.S. Government [Member] | Mortgage - Backed Securities - Residential [Member]    
Schedule Of Unrealized Losses On Securities [Line Items]    
Estimated Fair Value, Less Than 12 Months 5,584 4,898
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses (21) (11)
Estimated Fair Value, 12 Months or More 0 0
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses 0 0
Total Estimated Fair Value 5,584 4,898
Total Gross Unrealized Losses (21) (11)
Obligations of U.S. Government [Member] | Mortgage - Backed Securities - Commercial [Member]    
Schedule Of Unrealized Losses On Securities [Line Items]    
Estimated Fair Value, Less Than 12 Months 48,322 33,883
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses (962) (561)
Estimated Fair Value, 12 Months or More 32,683 0
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses (894) 0
Total Estimated Fair Value 81,005 33,883
Total Gross Unrealized Losses (1,856) (561)
Obligations of U.S. Government-Sponsored Enterprises [Member] | Mortgage - Backed Securities - Residential [Member]    
Schedule Of Unrealized Losses On Securities [Line Items]    
Estimated Fair Value, Less Than 12 Months 351,222 670,708
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses (2,295) (11,630)
Estimated Fair Value, 12 Months or More 400,984 56,200
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses (9,746) (2,202)
Total Estimated Fair Value 752,206 726,908
Total Gross Unrealized Losses (12,041) (13,832)
Obligations of U.S. Government-Sponsored Enterprises [Member] | Mortgage - Backed Securities - Commercial [Member]    
Schedule Of Unrealized Losses On Securities [Line Items]    
Estimated Fair Value, Less Than 12 Months 13,985 14,534
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses (71) (142)
Estimated Fair Value, 12 Months or More 0 0
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses 0 0
Total Estimated Fair Value 13,985 14,534
Total Gross Unrealized Losses (71) (142)
Obligations of U.S. Government-Sponsored Enterprises [Member] | Other Government - Sponsored Enterprises [Member]    
Schedule Of Unrealized Losses On Securities [Line Items]    
Estimated Fair Value, Less Than 12 Months 997 16,632
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses (1) (69)
Estimated Fair Value, 12 Months or More 99 0
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses 0 0
Total Estimated Fair Value 1,096 16,632
Total Gross Unrealized Losses (1) (69)
US States and Political Subdivisions Debt Securities [Member] | Other Government - Sponsored Enterprises [Member]    
Schedule Of Unrealized Losses On Securities [Line Items]    
Estimated Fair Value, Less Than 12 Months 7,144 33,277
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses (32) (762)
Estimated Fair Value, 12 Months or More 3,653 0
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses (129) 0
Total Estimated Fair Value 10,797 33,277
Total Gross Unrealized Losses $ (161) $ (762)