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Fair Value Measurements - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
Jun. 30, 2018
Dec. 31, 2017
Assets    
Securities available for sale, at fair value $ 4,650,915,000 $ 4,590,062,000
CRA and Community Development Investment Funds 1,878,000 0
Mortgage loans held for sale 78,843,000 134,916,000
Loans Receivable, Fair Value Disclosure 18,274,000 14,953,000
Derivative instruments 9,656,000 29,056,000
Liabilities    
Derivative instruments 37,781,000 16,191,000
Fair value assets transferred from Level 1 to Level 2 0  
Level 1    
Assets    
Securities available for sale, at fair value 0 0
CRA and Community Development Investment Funds 0  
Level 2    
Assets    
Securities available for sale, at fair value 4,650,915,000 4,590,062,000
CRA and Community Development Investment Funds 1,878,000  
Level 3    
Assets    
Securities available for sale, at fair value 0 0
CRA and Community Development Investment Funds 0  
Recurring    
Assets    
Securities available for sale, at fair value 4,650,915,000 4,590,062,000
CRA and Community Development Investment Funds 1,878,000  
Mortgage loans held for sale 78,843,000 134,916,000
Loans Receivable, Fair Value Disclosure 18,274,000 14,953,000
Derivative instruments 12,913,000 31,265,000
Total, Assets 4,762,823,000 4,771,196,000
Liabilities    
Derivative instruments 38,607,000 25,154,000
Total 38,607,000 25,154,000
Recurring | Level 1    
Assets    
Securities available for sale, at fair value 0 0
CRA and Community Development Investment Funds 0  
Mortgage loans held for sale 0 0
Loans Receivable, Fair Value Disclosure 0 0
Derivative instruments 0 0
Total, Assets 0 0
Liabilities    
Derivative instruments 0 0
Total 0 0
Recurring | Level 2    
Assets    
Securities available for sale, at fair value 4,650,915,000 4,590,062,000
CRA and Community Development Investment Funds 1,878,000  
Mortgage loans held for sale 78,843,000 134,916,000
Loans Receivable, Fair Value Disclosure 18,274,000 14,953,000
Derivative instruments 12,913,000 31,265,000
Total, Assets 4,762,823,000 4,771,196,000
Liabilities    
Derivative instruments 38,607,000 25,154,000
Total 38,607,000 25,154,000
Recurring | Level 3    
Assets    
Securities available for sale, at fair value 0 0
CRA and Community Development Investment Funds 0  
Mortgage loans held for sale 0 0
Loans Receivable, Fair Value Disclosure 0 0
Derivative instruments 0 0
Total, Assets 0 0
Liabilities    
Derivative instruments 0 0
Total $ 0 $ 0