Loans - Loans in Process of Foreclosure (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
Financing Receivable Impaired [Line Items]
Unpaid Principal Balance	$ 54,617	$ 51,902	$ 51,616
Total Recorded Investment	40,253	39,659
Residential Mortgage Loans [Member] | Loans In Process Of Foreclosure [Member]
Financing Receivable Impaired [Line Items]
Unpaid Principal Balance	3,142	1,294
Total Recorded Investment	2,862	1,162
Consumer Loans [Member] | Loans In Process Of Foreclosure [Member]
Financing Receivable Impaired [Line Items]
Unpaid Principal Balance	1,306	845
Total Recorded Investment	$ 1,098	$ 643