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Analysis of Impaired Loans by Class (Detail) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Jun. 30, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Principal Balance $ 75,751 $ 84,480  
Recorded Investment with No Allowance 46,795 49,576  
Recorded Investment with Allowance 20,391 28,749  
Total Recorded Investment 67,186 78,325  
Related Allowance 4,740 5,864 $ 1,561
Average Recorded Investment 73,956 53,354  
Real estate - residential [Member] | Prime [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Principal Balance 364 1,054  
Recorded Investment with No Allowance 282 939  
Total Recorded Investment 282 939  
Average Recorded Investment 707 1,433  
Commercial [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Principal Balance 64,008 72,739  
Recorded Investment with No Allowance 37,994 40,648  
Recorded Investment with Allowance 20,276 27,356  
Total Recorded Investment 58,270 68,004  
Related Allowance 4,714 5,668  
Average Recorded Investment 64,586 41,394  
Construction [Member] | Real estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Principal Balance 962 782  
Recorded Investment with No Allowance 311 331  
Recorded Investment with Allowance 115 118  
Total Recorded Investment 426 449  
Related Allowance 26 42  
Average Recorded Investment 437 802  
Real estate - commercial [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Principal Balance 7,839 7,117  
Recorded Investment with No Allowance 5,630 4,891  
Recorded Investment with Allowance   1,275  
Total Recorded Investment 5,630 6,166  
Related Allowance   154  
Average Recorded Investment 5,512 7,768  
Real estate - HELOC [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Principal Balance   214  
Recorded Investment with No Allowance   193  
Total Recorded Investment   193  
Average Recorded Investment 132 162  
Other [Member] | Consumer [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Unpaid Principal Balance 2,578 2,574  
Recorded Investment with No Allowance 2,578 2,574  
Total Recorded Investment 2,578 2,574  
Average Recorded Investment $ 2,582 $ 1,795