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Finance Receivables and Allowance for Credit Losses - Schedule of Impaired Loans (Detail) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]    
Recorded Investment, Total $ 108,632 $ 104,872
Unpaid Principal Balance, Total 112,089 109,235
Related Allowance 8,148 11,307
Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Related Allowance 4,561 7,111
Recorded Investment with no related allowance 29,001 40,414
Unpaid Principal Balance with no related allowance 29,634 41,212
Recorded Investment with related allowance 16,959 16,377
Unpaid Principal Balance with related allowance 17,283 16,483
Commercial Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Related Allowance 107 6
Recorded Investment with related allowance 467 237
Unpaid Principal Balance with related allowance 467 237
Commercial Real Estate - Other [Member]    
Financing Receivable, Impaired [Line Items]    
Related Allowance 3,330 4,015
Recorded Investment with no related allowance 30,585 26,998
Unpaid Principal Balance with no related allowance 32,413 30,264
Recorded Investment with related allowance 26,178 14,752
Unpaid Principal Balance with related allowance 26,710 14,802
Residential [Member]    
Financing Receivable, Impaired [Line Items]    
Related Allowance 54 49
Recorded Investment with no related allowance 1,610 1,383
Unpaid Principal Balance with no related allowance 1,631 1,422
Recorded Investment with related allowance 1,081 985
Unpaid Principal Balance with related allowance 1,081 985
Consumer [Member]    
Financing Receivable, Impaired [Line Items]    
Related Allowance 96 126
Recorded Investment with no related allowance 827 1,201
Unpaid Principal Balance with no related allowance 946 1,305
Recorded Investment with related allowance 1,924 2,525
Unpaid Principal Balance with related allowance $ 1,924 $ 2,525