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Loans - Impaired Loans (Detail) - USD ($)
$ in Thousands
Sep. 30, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance $ 35,632 $ 54,928
Recorded Investment With Related Allowance 80,816 77,460
Total Recorded Investment 116,448 132,388
Unpaid Contractual Principal Balance 127,333 145,473
Related Allowance 8,999 8,782
Commercial and industrial    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 4,312 7,863
Recorded Investment With Related Allowance 22,816 17,851
Total Recorded Investment 27,128 25,714
Unpaid Contractual Principal Balance 34,156 33,071
Related Allowance 3,506 3,439
Commercial real estate loans    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 22,400 38,960
Recorded Investment With Related Allowance 46,689 42,970
Total Recorded Investment 69,089 81,930
Unpaid Contractual Principal Balance 71,374 85,650
Related Allowance 4,575 3,671
Commercial real estate loans | Commercial real estate    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 20,428 30,113
Recorded Investment With Related Allowance 42,363 37,440
Total Recorded Investment 62,791 67,553
Unpaid Contractual Principal Balance 65,076 71,263
Related Allowance 4,152 3,354
Commercial real estate loans | Construction    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 1,972 8,847
Recorded Investment With Related Allowance 4,326 5,530
Total Recorded Investment 6,298 14,377
Unpaid Contractual Principal Balance 6,298 14,387
Related Allowance 423 317
Residential mortgage    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 8,706 7,842
Recorded Investment With Related Allowance 9,802 14,770
Total Recorded Investment 18,508 22,612
Unpaid Contractual Principal Balance 19,983 24,528
Related Allowance 708 1,377
Consumer    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 214 263
Recorded Investment With Related Allowance 1,509 1,869
Total Recorded Investment 1,723 2,132
Unpaid Contractual Principal Balance 1,820 2,224
Related Allowance 210 295
Consumer | Home equity    
Financing Receivable, Impaired [Line Items]    
Recorded Investment With No Related Allowance 214 263
Recorded Investment With Related Allowance 1,509 1,869
Total Recorded Investment 1,723 2,132
Unpaid Contractual Principal Balance 1,820 2,224
Related Allowance $ 210 $ 295