Quarterly report pursuant to Section 13 or 15(d)

Loans - Troubled Debt Restructurings, Disaggregated by Type of Concession and by Loan Type (Detail)

v3.4.0.3
Loans - Troubled Debt Restructurings, Disaggregated by Type of Concession and by Loan Type (Detail) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Financing Receivable, Modifications [Line Items]    
Non-Accrual TDRs, Deferral of Principal $ 2,858 $ 3,131
Non-Accrual TDRs, Deferral of Principal and Interest 822 1,329
Non-Accrual TDRs, Reduction of Principal and Interest 1,261 1,329
Non-Accrual TDRs, Extension of Maturity 991 1,089
Non-Accrual TDRs, Total 5,932 6,878
Accrual TDRs, Deferral of Principal 4,428 4,241
Accrual Tdrs Deferral Of Principal and Interest 211 214
Accrual TDRs, Reduction of Principal and Interest 3,188 3,222
Accrual TDRs, Extension of Maturity 2,492 2,622
Accrual TDRs 10,319 10,299
Real estate loans [Member] | Retail [Member]    
Financing Receivable, Modifications [Line Items]    
Non-Accrual TDRs, Deferral of Principal 0 0
Non-Accrual TDRs, Deferral of Principal and Interest 0 0
Non-Accrual TDRs, Reduction of Principal and Interest 20 0
Non-Accrual TDRs, Extension of Maturity 328 344
Non-Accrual TDRs, Total 348 344
Accrual TDRs, Deferral of Principal 0 0
Accrual Tdrs Deferral Of Principal and Interest 0 0
Accrual TDRs, Reduction of Principal and Interest 1,225 1,227
Accrual TDRs, Extension of Maturity 0 0
Accrual TDRs 1,225 1,227
Real estate loans [Member] | Hospitality [Member]    
Financing Receivable, Modifications [Line Items]    
Non-Accrual TDRs, Deferral of Principal 1,180 1,216
Non-Accrual TDRs, Deferral of Principal and Interest 18 28
Non-Accrual TDRs, Reduction of Principal and Interest 0 0
Non-Accrual TDRs, Extension of Maturity 0 0
Non-Accrual TDRs, Total 1,198 1,244
Accrual TDRs, Deferral of Principal 411 414
Accrual Tdrs Deferral Of Principal and Interest 0 0
Accrual TDRs, Reduction of Principal and Interest 0 0
Accrual TDRs, Extension of Maturity 0 0
Accrual TDRs 411 414
Real estate loans [Member] | Gas station [Member]    
Financing Receivable, Modifications [Line Items]    
Non-Accrual TDRs, Deferral of Principal 917 959
Non-Accrual TDRs, Deferral of Principal and Interest 0 0
Non-Accrual TDRs, Reduction of Principal and Interest 0 0
Non-Accrual TDRs, Extension of Maturity 0 0
Non-Accrual TDRs, Total 917 959
Accrual TDRs, Deferral of Principal 0 0
Accrual Tdrs Deferral Of Principal and Interest 0 0
Accrual TDRs, Reduction of Principal and Interest 0 0
Accrual TDRs, Extension of Maturity 0 0
Accrual TDRs 0 0
Real estate loans [Member] | Other [Member]    
Financing Receivable, Modifications [Line Items]    
Non-Accrual TDRs, Deferral of Principal 719 0
Non-Accrual TDRs, Deferral of Principal and Interest 804 1,301
Non-Accrual TDRs, Reduction of Principal and Interest 197 216
Non-Accrual TDRs, Extension of Maturity 3 8
Non-Accrual TDRs, Total 1,723 1,525
Accrual TDRs, Deferral of Principal 2,780 3,537
Accrual Tdrs Deferral Of Principal and Interest 0 0
Accrual TDRs, Reduction of Principal and Interest 314 322
Accrual TDRs, Extension of Maturity 1,372 1,378
Accrual TDRs 4,466 5,237
Real estate loans [Member] | Residential property [Member]    
Financing Receivable, Modifications [Line Items]    
Non-Accrual TDRs, Deferral of Principal 0 689
Non-Accrual TDRs, Deferral of Principal and Interest 0 0
Non-Accrual TDRs, Reduction of Principal and Interest 0 0
Non-Accrual TDRs, Extension of Maturity 0 0
Non-Accrual TDRs, Total 0 689
Accrual TDRs, Deferral of Principal 801 0
Accrual Tdrs Deferral Of Principal and Interest 0 0
Accrual TDRs, Reduction of Principal and Interest 0 0
Accrual TDRs, Extension of Maturity 296 299
Accrual TDRs 1,097 299
Commercial and industrial loans [Member] | Commercial term [Member]    
Financing Receivable, Modifications [Line Items]    
Non-Accrual TDRs, Deferral of Principal 42 45
Non-Accrual TDRs, Deferral of Principal and Interest 0 0
Non-Accrual TDRs, Reduction of Principal and Interest 1,044 997
Non-Accrual TDRs, Extension of Maturity 622 679
Non-Accrual TDRs, Total 1,708 1,721
Accrual TDRs, Deferral of Principal 186 40
Accrual Tdrs Deferral Of Principal and Interest 211 214
Accrual TDRs, Reduction of Principal and Interest 1,522 1,673
Accrual TDRs, Extension of Maturity 824 945
Accrual TDRs 2,743 2,872
Commercial and industrial loans [Member] | Commercial lines of credit [Member]    
Financing Receivable, Modifications [Line Items]    
Non-Accrual TDRs, Deferral of Principal 0 222
Non-Accrual TDRs, Deferral of Principal and Interest 0 0
Non-Accrual TDRs, Reduction of Principal and Interest 0 0
Non-Accrual TDRs, Extension of Maturity 38 58
Non-Accrual TDRs, Total 38 280
Accrual TDRs, Deferral of Principal 0 0
Accrual Tdrs Deferral Of Principal and Interest 0 0
Accrual TDRs, Reduction of Principal and Interest 0 0
Accrual TDRs, Extension of Maturity 0 0
Accrual TDRs 0 0
Consumer loans [Member]    
Financing Receivable, Modifications [Line Items]    
Non-Accrual TDRs, Deferral of Principal 0 0
Non-Accrual TDRs, Deferral of Principal and Interest 0 0
Non-Accrual TDRs, Reduction of Principal and Interest 0 116
Non-Accrual TDRs, Extension of Maturity 0 0
Non-Accrual TDRs, Total 0 116
Accrual TDRs, Deferral of Principal 250 250
Accrual Tdrs Deferral Of Principal and Interest 0 0
Accrual TDRs, Reduction of Principal and Interest 127 0
Accrual TDRs, Extension of Maturity 0 0
Accrual TDRs $ 377 $ 250