XML 17 R55.htm IDEA: XBRL DOCUMENT v3.3.0.814
Loans and Leases - Additional Information (Detail) - USD ($)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Consumer loans $ 181,298   $ 180,588
Commercial construction loans 294,249   296,156
Carrying amount $ 11,873,645   11,247,038
Sustained period of delinquency for impairment evaluation 90 days 90 days  
Minimum reserves for commercial loan $ 500    
Minimum amount to allocate specific valuation allowance 500    
Allowance for loan losses 6,564   7,974
Restructured loans returned to performing status 7,577    
Valuation for impairment of loans with pooled reserves 500   500
Pooled reserves for all other classes of loans 3,350   3,448
Consumer Lines of Credit [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying amount 1,127,002   1,110,976
Allowance for loan losses 642   267
Commercial Real Estate [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying amount 3,949,246   3,815,708
Allowance for loan losses 3,056   3,286
Commercial and Industrial [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying amount 2,491,355   2,318,015
Allowance for loan losses 579   1,484
Direct Installment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying amount 1,692,638   1,644,621
Allowance for loan losses 1,427   1,847
Residential Mortgages [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying amount 1,386,386   1,263,053
Allowance for loan losses 558   858
Indirect Installment [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying amount 974,028   875,551
Allowance for loan losses 302   232
Purchased Credit-Impaired Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Carrying amount 8,766   9,556
Specific reserves for commercial TDRs [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Reserves in allowance for loan losses, TDRs 438   371
Pooled reserves for commercial TDRs [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Reserves in allowance for loan losses, TDRs $ 1,146   $ 1,215
Loan Portfolio Diversification Risk [Member] | Loans and Leases Receivable Net of Deferred Income [Member] | Consumer Lines of Credit [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Percentage of portfolio 1.50%   1.60%
Loan Portfolio Diversification Risk [Member] | Loans and Leases Receivable Net of Deferred Income [Member] | Constuction Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Percentage of portfolio 2.50%   2.60%
Loan Portfolio Diversification Risk [Member] | Commercial Real Estate Loans [Member] | Owner-Occupied [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Percentage of portfolio 38.90%   41.60%
Loan Portfolio Diversification Risk [Member] | Commercial Real Estate Loans [Member] | Non-Owner-Occupied [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Percentage of portfolio 61.10%   58.40%
Credit Concentration Risk [Member] | Acquired Loans Receivable [Member] | Purchased Credit-Impaired Loans [Member] | Maximum [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Percentage of portfolio 1.00%    
Commercial Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Threshold period past due for default non-accrual status of trade accounts receivable 90 days    
Installment Loans [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Threshold period past due for default non-accrual status of trade accounts receivable 120 days    
Residential Mortgages [Member]      
Accounts, Notes, Loans and Financing Receivable [Line Items]      
Threshold period past due for default non-accrual status of trade accounts receivable 180 days    
Carrying value of OREO through foreclosure $ 4,285    
Mortgage loans on real estate, foreclosure $ 12,786