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Loans - Impaired Loans (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance $ 56,590 $ 54,928
Recorded Investment With Related Allowance 80,989 77,460
Total Recorded Investment 137,579 132,388
Unpaid Contractual Principal Balance 149,817 145,473
Related Allowance 9,377 8,782
Commercial and industrial    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 7,758 7,863
Recorded Investment With Related Allowance 19,838 17,851
Total Recorded Investment 27,596 25,714
Unpaid Contractual Principal Balance 33,913 33,071
Related Allowance 3,578 3,439
Commercial real estate loans    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 41,272 38,960
Recorded Investment With Related Allowance 44,073 42,970
Total Recorded Investment 85,345 81,930
Unpaid Contractual Principal Balance 89,247 85,650
Related Allowance 4,125 3,671
Commercial real estate loans | Commercial real estate    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 32,587 30,113
Recorded Investment With Related Allowance 42,816 37,440
Total Recorded Investment 75,403 67,553
Unpaid Contractual Principal Balance 79,295 71,263
Related Allowance 4,088 3,354
Commercial real estate loans | Construction    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 8,685 8,847
Recorded Investment With Related Allowance 1,257 5,530
Total Recorded Investment 9,942 14,377
Unpaid Contractual Principal Balance 9,952 14,387
Related Allowance 37 317
Residential mortgage    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 7,356 7,842
Recorded Investment With Related Allowance 14,624 14,770
Total Recorded Investment 21,980 22,612
Unpaid Contractual Principal Balance 23,907 24,528
Related Allowance 1,267 1,377
Consumer    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 204 263
Recorded Investment With Related Allowance 2,454 1,869
Total Recorded Investment 2,658 2,132
Unpaid Contractual Principal Balance 2,750 2,224
Related Allowance 407 295
Consumer | Home equity    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 204 263
Recorded Investment With Related Allowance 2,454 1,869
Total Recorded Investment 2,658 2,132
Unpaid Contractual Principal Balance 2,750 2,224
Related Allowance $ 407 $ 295