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Loans - Impaired Loans (Detail) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance $ 41,484 $ 54,928
Recorded Investment With Related Allowance 85,701 77,460
Total Recorded Investment 127,185 132,388
Unpaid Contractual Principal Balance 135,527 145,473
Related Allowance 9,291 8,782
Commercial and industrial    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 3,211 7,863
Recorded Investment With Related Allowance 19,500 17,851
Total Recorded Investment 22,711 25,714
Unpaid Contractual Principal Balance 26,614 33,071
Related Allowance 3,294 3,439
Commercial real estate loans    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 31,173 38,960
Recorded Investment With Related Allowance 48,180 42,970
Total Recorded Investment 79,353 81,930
Unpaid Contractual Principal Balance 82,227 85,650
Related Allowance 4,339 3,671
Commercial real estate loans | Commercial real estate    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 23,758 30,113
Recorded Investment With Related Allowance 46,711 37,440
Total Recorded Investment 70,469 67,553
Unpaid Contractual Principal Balance 73,333 71,263
Related Allowance 4,282 3,354
Commercial real estate loans | Construction    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 7,415 8,847
Recorded Investment With Related Allowance 1,469 5,530
Total Recorded Investment 8,884 14,377
Unpaid Contractual Principal Balance 8,894 14,387
Related Allowance 57 317
Residential mortgage    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 6,901 7,842
Recorded Investment With Related Allowance 15,753 14,770
Total Recorded Investment 22,654 22,612
Unpaid Contractual Principal Balance 24,126 24,528
Related Allowance 1,261 1,377
Consumer    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 199 263
Recorded Investment With Related Allowance 2,268 1,869
Total Recorded Investment 2,467 2,132
Unpaid Contractual Principal Balance 2,560 2,224
Related Allowance 397 295
Consumer | Home equity    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 199 263
Recorded Investment With Related Allowance 2,268 1,869
Total Recorded Investment 2,467 2,132
Unpaid Contractual Principal Balance 2,560 2,224
Related Allowance $ 397 $ 295