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Junior Subordinated Debentures (Narrative) (Detail) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
Subordinated Borrowing [Line Items]      
Percentage ownership interest in subsidiary trusts 100.00%    
Common securities, approximate percentage of junior subordinated debentures 3.00%    
Trust preferred securities, approximate percentage of junior subordinated debentures 97.00%    
Junior subordinated debentures $ 249,493 $ 249,493 $ 249,493
Consecutive quarters of deferred payment 20    
Junior Subordinated Debt      
Subordinated Borrowing [Line Items]      
Debt, weighted average interest rate 2.47%    
Debt, Hedge Adjusted Weighted Average Interest Rate 3.28%    
Tier One Risk Based Capital $ 60,500    
Tier Two Risk Based Capital 181,500    
Cash Flow Hedge of Junior Subordinated Debentures | Cash Flow Hedging | Designated as Hedging Instrument | Interest Rate Swaps and Caps      
Subordinated Borrowing [Line Items]      
Notional amount $ 225,000