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Derivatives and Hedging Activities - Additional Information (Detail)
 3 Months Ended
Mar. 31, 2017
USD ($)
Contract
shares
Mar. 31, 2016
USD ($)
Dec. 31, 2016
USD ($)
Dec. 01, 2016
USD ($)
Derivative [Line Items]        
Embedded Derivative, Fair Value of Embedded Derivative Asset $ 14,700,000     $ 10,800,000
Business Acquisitions, Purchase Price Allocation, Subsequent Years, Remaining Adjustments 1,600,000      
Marked To Market Adjustment On Derivative Instruments $ 2,300,000      
Preferred Stock, Shares Issued | shares 867,846      
Credit Default Option [Member]        
Derivative [Line Items]        
Credit Risk Related Contingent Features Termination Value $ 4,800,000      
Net Liability Position [Member]        
Derivative [Line Items]        
Credit Risk Related Contingent Features Termination Value 4,800,000      
ERROR in label resolution.        
Derivative [Line Items]        
Fair Value of Credit Risk Derivatives $ 5,000,000      
Designated as Hedging Instrument [Member] | Interest Rate Caps        
Derivative [Line Items]        
Derivative, Number of Instruments Held | Contract 2      
Derivative, Notional Amount $ 50,000,000      
Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]        
Derivative [Line Items]        
Derivative, Number of Instruments Held | Contract 16      
Derivative, Notional Amount $ 700,000,000      
Designated as Hedging Instrument [Member] | Interest Expense        
Derivative [Line Items]        
Loss on Cash Flow Hedge Ineffectiveness (3,000) $ (43,000)    
Change in fair value of interest rate derivatives included in AOCI and expected to be reclassified in the next 12 months 1,400,000      
Other Assets [Member]        
Derivative [Line Items]        
Interest Rate Cash Flow Hedge Asset at Fair Value $ 4,198,000   $ 2,364,000