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Fair Value Measurements - Balances of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets Measured at Fair Value, Securities available for sale $ 2,231,987 $ 1,630,567 $ 1,534,065
Derivative assets 54,220 53,202  
Derivative financial instruments 47,267 51,605  
U.S. Treasury [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets Measured at Fair Value, Debt securities available for sale 29,953 29,796 29,682
U.S. Government-Sponsored Entities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets Measured at Fair Value, Debt securities available for sale 365,098 367,994 337,133
Agency Collateralized Mortgage Obligations [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets Measured at Fair Value, Debt securities available for sale 535,974 495,830 573,171
Assets Measured at Fair Value, Securities available for sale 535,974    
Non-Agency Collateralized Mortgage Obligations [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets Measured at Fair Value, Debt securities available for sale 897 1,190 1,431
Assets Measured at Fair Value, Securities available for sale 897    
Commercial Mortgage-Backed Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets Measured at Fair Value, Debt securities available for sale 1,291 4,287 7,880
Assets Measured at Fair Value, Securities available for sale 1,291    
States of the U.S. and Political Subdivisions [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets Measured at Fair Value, Debt securities available for sale 35,849 11,057 13,158
Other Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets Measured at Fair Value, Debt securities available for sale 9,487 14,286 $ 16,178
Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets Measured at Fair Value, Securities available for sale 148 225  
Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets Measured at Fair Value, Securities available for sale 2,230,453 1,628,719  
Derivative assets 54,220 53,202  
Derivative financial instruments 47,267 51,605  
Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets Measured at Fair Value, Securities available for sale 1,386 1,623  
Fair Value, Measurements, Recurring [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets Measured at Fair Value, Debt securities available for sale 2,231,347 1,629,271  
Assets Measured at Fair Value, Equity securities available for sale 640 1,296  
Assets Measured at Fair Value, Securities available for sale 2,231,987 1,630,567  
Derivative assets 54,220 53,202  
Assets measured at fair value on a recurring basis, Total 2,286,207 1,683,769  
Derivative financial instruments 47,267 51,605  
Liabilities measured at fair value on a recurring basis, Total 47,267 51,605  
Fair Value, Measurements, Recurring [Member] | U.S. Treasury [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets Measured at Fair Value, Debt securities available for sale 29,953 29,796  
Fair Value, Measurements, Recurring [Member] | U.S. Government-Sponsored Entities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets Measured at Fair Value, Debt securities available for sale 365,098 367,994  
Fair Value, Measurements, Recurring [Member] | Agency Collateralized Mortgage Obligations [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets Measured at Fair Value, Debt securities available for sale 535,974 495,830  
Fair Value, Measurements, Recurring [Member] | Non-Agency Collateralized Mortgage Obligations [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets Measured at Fair Value, Debt securities available for sale 897 1,190  
Fair Value, Measurements, Recurring [Member] | Commercial Mortgage-Backed Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets Measured at Fair Value, Debt securities available for sale 1,291 4,287  
Fair Value, Measurements, Recurring [Member] | States of the U.S. and Political Subdivisions [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets Measured at Fair Value, Debt securities available for sale 35,849 11,057  
Fair Value, Measurements, Recurring [Member] | Other Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets Measured at Fair Value, Debt securities available for sale 9,487 14,286  
Fair Value, Measurements, Recurring [Member] | Trading Assets [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative assets 44,951 50,017  
Fair Value, Measurements, Recurring [Member] | Not for Trading Assets [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative assets 9,269 3,185  
Fair Value, Measurements, Recurring [Member] | Financial Services Industry [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets Measured at Fair Value, Equity securities available for sale 492 1,168  
Fair Value, Measurements, Recurring [Member] | Insurance Services Industry [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets Measured at Fair Value, Equity securities available for sale 148 128  
Fair Value, Measurements, Recurring [Member] | Agency Mortgage-Backed Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets Measured at Fair Value, Debt securities available for sale 1,252,798 704,831  
Fair Value, Measurements, Recurring [Member] | Trading Liabilities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative financial instruments 45,973 50,510  
Fair Value, Measurements, Recurring [Member] | Not for Trading Liabilities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative financial instruments 1,294 1,095  
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets Measured at Fair Value, Equity securities available for sale 148 225  
Assets Measured at Fair Value, Securities available for sale 148 225  
Assets measured at fair value on a recurring basis, Total 148 225  
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Financial Services Industry [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets Measured at Fair Value, Equity securities available for sale   97  
Fair Value, Measurements, Recurring [Member] | Level 1 [Member] | Insurance Services Industry [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets Measured at Fair Value, Equity securities available for sale 148 128  
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets Measured at Fair Value, Debt securities available for sale 2,230,453 1,628,087  
Assets Measured at Fair Value, Equity securities available for sale   632  
Assets Measured at Fair Value, Securities available for sale 2,230,453 1,628,719  
Derivative assets 54,220 53,202  
Assets measured at fair value on a recurring basis, Total 2,284,673 1,681,921  
Derivative financial instruments 47,267 51,605  
Liabilities measured at fair value on a recurring basis, Total 47,267 51,605  
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | U.S. Treasury [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets Measured at Fair Value, Debt securities available for sale 29,953 29,796  
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | U.S. Government-Sponsored Entities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets Measured at Fair Value, Debt securities available for sale 365,098 367,994  
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Agency Collateralized Mortgage Obligations [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets Measured at Fair Value, Debt securities available for sale 535,974 495,830  
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Non-Agency Collateralized Mortgage Obligations [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets Measured at Fair Value, Debt securities available for sale 3 6  
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Commercial Mortgage-Backed Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets Measured at Fair Value, Debt securities available for sale 1,291 4,287  
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | States of the U.S. and Political Subdivisions [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets Measured at Fair Value, Debt securities available for sale 35,849 11,057  
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Other Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets Measured at Fair Value, Debt securities available for sale 9,487 14,286  
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Trading Assets [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative assets 44,951 50,017  
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Not for Trading Assets [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative assets 9,269 3,185  
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Financial Services Industry [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets Measured at Fair Value, Equity securities available for sale   632  
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Agency Mortgage-Backed Securities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets Measured at Fair Value, Debt securities available for sale 1,252,798 704,831  
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Trading Liabilities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative financial instruments 45,973 50,510  
Fair Value, Measurements, Recurring [Member] | Level 2 [Member] | Not for Trading Liabilities [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Derivative financial instruments 1,294 1,095  
Fair Value, Measurements, Recurring [Member] | Level 3 [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets Measured at Fair Value, Debt securities available for sale 894 1,184  
Assets Measured at Fair Value, Equity securities available for sale 492 439  
Assets Measured at Fair Value, Securities available for sale 1,386 1,623  
Assets measured at fair value on a recurring basis, Total 1,386 1,623  
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Non-Agency Collateralized Mortgage Obligations [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets Measured at Fair Value, Debt securities available for sale 894 1,184  
Fair Value, Measurements, Recurring [Member] | Level 3 [Member] | Financial Services Industry [Member]      
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]      
Assets Measured at Fair Value, Equity securities available for sale $ 492 $ 439