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Impairment of Investment Securities - Schedule of Unrealized Losses and Estimated Fair Values (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Schedule Of Unrealized Losses On Securities [Line Items]    
Estimated Fair Value, Less Than 12 Months $ 773,932 $ 493,938
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses (13,175) (3,881)
Estimated Fair Value, 12 Months or More 85,152 293,076
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses (9,326) (14,910)
Total Estimated Fair Value 859,084 787,014
Total Gross Unrealized Losses (22,501) (18,791)
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 28,952 29,957
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses (7,124) (7,497)
Total Estimated Fair Value 28,952 29,957
Total Gross Unrealized Losses (7,124) (7,497)
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 4,898 6,798
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses (11) (20)
Estimated Fair Value, 12 Months or More 0 0
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses 0 0
Total Estimated Fair Value 4,898 6,798
Total Gross Unrealized Losses (11) (20)
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 33,883  
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses (561)  
Estimated Fair Value, 12 Months or More 0  
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses 0  
Total Estimated Fair Value 33,883  
Total Gross Unrealized Losses (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 670,708 436,011
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses (11,630) (3,293)
Estimated Fair Value, 12 Months or More 56,200 263,119
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses (2,202) (7,413)
Total Estimated Fair Value 726,908 699,130
Total Gross Unrealized Losses (13,832) (10,706)
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 14,534  
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses (142)  
Estimated Fair Value, 12 Months or More 0  
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses 0  
Total Estimated Fair Value 14,534  
Total Gross Unrealized Losses (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 16,632 12,316
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses (69) (85)
Estimated Fair Value, 12 Months or More 0 0
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses 0 0
Total Estimated Fair Value 16,632 12,316
Total Gross Unrealized Losses (69) (85)
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 33,277 7,208
Available For Sale Securities Continuous Unrealized Income Loss Position Less Than Twelve Months Aggregate Gain Losses (762) (58)
Estimated Fair Value, 12 Months or More 0 0
SecuritiesContinuousUnrealizedLossPosition12MonthsOrLongerAggregateLosses 0 0
Total Estimated Fair Value 33,277 7,208
Total Gross Unrealized Losses $ (762) $ (58)