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Derivative Financial Instruments - Fair Value of Derivative Financial Instruments (Detail) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Derivatives, Fair Value [Line Items]    
Total Asset Derivatives $ 954 $ 608
Total Liability Derivatives 2,542 3,160
Derivatives Designated as Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Total Asset Derivatives 811 6
Total Liability Derivatives 2,539 3,138
Derivatives Designated as Hedging Instruments [Member] | Interest Rate Contracts One [Member] | Other Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Total Liability Derivatives 811 6
Derivatives Designated as Hedging Instruments [Member] | Interest Rate Contracts Two [Member] | Other Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Total Liability Derivatives 1,728 3,132
Derivatives Designated as Hedging Instruments [Member] | Interest Rate Contracts Two [Member] | Other Assets [Member]    
Derivatives, Fair Value [Line Items]    
Total Asset Derivatives 811 6
Derivatives Not Designated as Hedging Instruments [Member]    
Derivatives, Fair Value [Line Items]    
Total Asset Derivatives 143 602
Total Liability Derivatives 3 22
Derivatives Not Designated as Hedging Instruments [Member] | Mortgage Loan Contracts [Member] | Other Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Total Liability Derivatives 3 22
Derivatives Not Designated as Hedging Instruments [Member] | Mortgage Loan Contracts [Member] | Other Assets [Member]    
Derivatives, Fair Value [Line Items]    
Total Asset Derivatives $ 143 $ 602