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Balance Sheet Offsetting - Financial Instruments Eligible for Offset Consolidated Balance Sheet (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Gross Amount Recognized, Derivative, Financial Assets $ 3,810 $ 3,798
Gross Amount Offset, Derivatives, Financial Assets 0 0
Net Amount Recognized, Derivative, Financial Assets 3,810 3,798
Gross Amount Recognized, Resell Agreements, Financial Assets 9,642 9,642
Gross Amount Offset, Resell Agreements, Financial Assets 0 0
Net Amount Recognized, Resell Agreements, Financial Assets 9,642 9,642
Gross Amount Recognized, Financial Assets 13,452 13,440
Gross Amount Offset, Financial Assets 0 0
Net Amount Recognized, Financial Assets 13,452 13,440
Gross Amount Recognized, Derivative, Financial Liabilities 27,375 32,534
Gross Amount Offset, Derivative, Financial Liabilities 0 0
Net Amount Recognized, Derivative, Financial Liabilities 27,375 32,534
Gross Amount Recognized, Repurchase Agreements, Financial Liabilities 1,117,199 963,317
Gross Amount Offset, Repurchase Agreements, Financial Liabilities 0 0
Net Amount Recognized, Repurchase Agreements, Financial Liabilities 1,117,199 963,317
Gross Amount Recognized, Financial Liabilities 1,144,574 995,851
Gross Amount Offset, Financial Liabilities 0 0
Net Amount Recognized, Financial Liabilities 1,144,574 995,851
Loan Lease Interest Rate Swaps And Caps [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Gross Amount Recognized, Derivative, Financial Assets 2,140 3,592
Gross Amount Offset, Derivatives, Financial Assets 0 0
Net Amount Recognized, Derivative, Financial Assets 2,140 3,592
Commodity Swaps And Options [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Gross Amount Recognized, Derivative, Financial Assets 1,592 206
Gross Amount Offset, Derivatives, Financial Assets 0 0
Net Amount Recognized, Derivative, Financial Assets 1,592 206
Gross Amount Recognized, Derivative, Financial Liabilities 13,774 5,757
Gross Amount Offset, Derivative, Financial Liabilities 0 0
Net Amount Recognized, Derivative, Financial Liabilities 13,774 5,757
Foreign Currency Forward Contracts [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Gross Amount Recognized, Derivative, Financial Assets 78 0
Gross Amount Offset, Derivatives, Financial Assets 0 0
Net Amount Recognized, Derivative, Financial Assets 78 0
Gross Amount Recognized, Derivative, Financial Liabilities 188 33
Gross Amount Offset, Derivative, Financial Liabilities 0 0
Net Amount Recognized, Derivative, Financial Liabilities 188 33
Loan Lease Interest Rate Swaps [Member]    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Gross Amount Recognized, Derivative, Financial Liabilities 13,413 26,744
Gross Amount Offset, Derivative, Financial Liabilities 0 0
Net Amount Recognized, Derivative, Financial Liabilities $ 13,413 $ 26,744