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Past Due Loans, Allowance For Credit Losses, Impaired Loans, and TDRs (Detail) - Loans and Related Allowance for Credit Losses by Portfolio Segment - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]        
Total loans $ 7,161,715 $ 6,736,853    
Total Allowance for Credit Losses 74,855 74,510 $ 87,121 $ 102,812
Receivables Acquired with Deteriorated Credit Quality [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans Purchased impaired loans 60,205 83,394    
Commercial, Industrial, and Agricultural        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans Individually Evaluated for Impairment 2,871 19,796    
Loans Collectively Evaluated for Impairment 2,902,361 2,588,141    
Total loans 2,912,166 2,611,805    
Allowance for Credit Losses Individually Evaluated for Impairment 883 2,249    
Allowance for Credit Losses Collectively Evaluated for Impairment 35,378 27,209    
Total Allowance for Credit Losses 37,074 29,458    
Commercial, Industrial, and Agricultural | Receivables Acquired with Deteriorated Credit Quality [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans Purchased impaired loans 6,934 3,868    
Total Allowance for Credit Losses 813 0    
Office, Retail, and Industrial        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans Individually Evaluated for Impairment 6,162 12,332    
Loans Collectively Evaluated for Impairment 1,376,789 1,458,918    
Total loans 1,395,454 1,478,379    
Allowance for Credit Losses Individually Evaluated for Impairment 715 271    
Allowance for Credit Losses Collectively Evaluated for Impairment 10,833 10,721    
Total Allowance for Credit Losses 13,116 10,992    
Office, Retail, and Industrial | Receivables Acquired with Deteriorated Credit Quality [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans Purchased impaired loans 12,503 7,129    
Total Allowance for Credit Losses 1,568 0    
Multi-family        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans Individually Evaluated for Impairment 800 939    
Loans Collectively Evaluated for Impairment 526,037 561,400    
Total loans 528,324 564,421    
Allowance for Credit Losses Individually Evaluated for Impairment 0 0    
Allowance for Credit Losses Collectively Evaluated for Impairment 2,367 2,249    
Total Allowance for Credit Losses 2,462 2,249    
Multi-family | Receivables Acquired with Deteriorated Credit Quality [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans Purchased impaired loans 1,487 2,082    
Total Allowance for Credit Losses 95 0    
Construction        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans Individually Evaluated for Impairment 178 6,671    
Loans Collectively Evaluated for Impairment 212,671 195,094    
Total loans 216,882 204,236    
Allowance for Credit Losses Individually Evaluated for Impairment 0 0    
Allowance for Credit Losses Collectively Evaluated for Impairment 1,160 2,297    
Total Allowance for Credit Losses 1,440 2,297    
Construction | Receivables Acquired with Deteriorated Credit Quality [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans Purchased impaired loans 4,033 2,471    
Total Allowance for Credit Losses 280 0    
Other Commercial Real Estate        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans Individually Evaluated for Impairment 3,665 3,266    
Loans Collectively Evaluated for Impairment 913,161 880,087    
Total loans 931,190 887,897    
Allowance for Credit Losses Individually Evaluated for Impairment 0 11    
Allowance for Credit Losses Collectively Evaluated for Impairment 5,367 8,316    
Total Allowance for Credit Losses 6,088 8,327    
Other Commercial Real Estate | Receivables Acquired with Deteriorated Credit Quality [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans Purchased impaired loans 14,364 4,544    
Total Allowance for Credit Losses 721 0    
Total Commercial Real Estate        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans Individually Evaluated for Impairment 10,805 23,208    
Loans Collectively Evaluated for Impairment 3,028,658 3,095,499    
Total loans 3,071,850 3,134,933    
Allowance for Credit Losses Individually Evaluated for Impairment 715 282    
Allowance for Credit Losses Collectively Evaluated for Impairment 19,727 23,583    
Total Allowance for Credit Losses 23,106 23,865    
Total Commercial Real Estate | Receivables Acquired with Deteriorated Credit Quality [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans Purchased impaired loans 32,387 16,226    
Total Allowance for Credit Losses 2,664 0    
Total Corporate Loans        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans Individually Evaluated for Impairment 13,676 43,004    
Loans Collectively Evaluated for Impairment 5,931,019 5,683,640    
Total loans 5,984,016 5,746,738    
Allowance for Credit Losses Individually Evaluated for Impairment 1,598 2,531    
Allowance for Credit Losses Collectively Evaluated for Impairment 55,105 50,792    
Total Allowance for Credit Losses 60,180 53,323    
Total Corporate Loans | Receivables Acquired with Deteriorated Credit Quality [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans Purchased impaired loans 39,321 20,094    
Total Allowance for Credit Losses 3,477 0    
Consumer        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans Individually Evaluated for Impairment 0 0    
Loans Collectively Evaluated for Impairment 1,135,959 902,062    
Total loans 1,146,924 910,680    
Allowance for Credit Losses Individually Evaluated for Impairment 0 0    
Allowance for Credit Losses Collectively Evaluated for Impairment 11,425 11,822    
Total Allowance for Credit Losses 11,812 12,145    
Consumer | Receivables Acquired with Deteriorated Credit Quality [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans Purchased impaired loans 10,965 8,618    
Total Allowance for Credit Losses 387 323    
Total Loans Excluding Covered Loans        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans Individually Evaluated for Impairment 13,676 43,004    
Loans Collectively Evaluated for Impairment 7,066,978 6,585,702    
Total loans 7,130,940 6,657,418    
Allowance for Credit Losses Individually Evaluated for Impairment 1,598 2,531    
Allowance for Credit Losses Collectively Evaluated for Impairment 66,530 62,614    
Total Allowance for Credit Losses 71,992 65,468    
Total Loans Excluding Covered Loans | Receivables Acquired with Deteriorated Credit Quality [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans Purchased impaired loans 50,286 28,712    
Total Allowance for Credit Losses 3,864 323    
Covered Loans        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans Individually Evaluated for Impairment 0 0    
Loans Collectively Evaluated for Impairment 20,856 24,753    
Total loans 30,775 79,435    
Allowance for Credit Losses Individually Evaluated for Impairment 0 0    
Allowance for Credit Losses Collectively Evaluated for Impairment 248 488    
Total Allowance for Credit Losses 1,638 7,226    
Covered Loans | Receivables Acquired with Deteriorated Credit Quality [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans Purchased impaired loans 9,919 54,682    
Total Allowance for Credit Losses 1,390 6,738    
Reserve for Unfunded Commitments        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans Individually Evaluated for Impairment 0 0    
Loans Collectively Evaluated for Impairment 0 0    
Total loans 0 0    
Allowance for Credit Losses Individually Evaluated for Impairment 0 0    
Allowance for Credit Losses Collectively Evaluated for Impairment 1,225 1,816    
Total Allowance for Credit Losses 1,225 1,816    
Reserve for Unfunded Commitments | Receivables Acquired with Deteriorated Credit Quality [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans Purchased impaired loans 0 0    
Total Allowance for Credit Losses 0 0    
Total Loans Included in Calculation of Allowance        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans Individually Evaluated for Impairment 13,676 43,004    
Loans Collectively Evaluated for Impairment 7,087,834 6,610,455    
Total loans 7,161,715 6,736,853    
Allowance for Credit Losses Individually Evaluated for Impairment 1,598 2,531    
Allowance for Credit Losses Collectively Evaluated for Impairment 68,003 64,918    
Total Allowance for Credit Losses 74,855 74,510    
Total Loans Included in Calculation of Allowance | Receivables Acquired with Deteriorated Credit Quality [Member]        
Financing Receivable, Allowance for Credit Losses [Line Items]        
Loans Purchased impaired loans 60,205 83,394    
Total Allowance for Credit Losses $ 5,254 $ 7,061