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Loans - Pre-Modification and Post-Modification (Detail)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
contract
Mar. 31, 2017
USD ($)
contract
Troubled Debt Restructurings    
Number of contracts, troubled restructurings (in contract) | contract 12 14
Pre-Modification Outstanding Recorded Investment $ 4,811 $ 11,640
Post-Modification Outstanding Recorded Investment $ 4,662 $ 10,510
Number of contracts, troubled debt restructurings subsequently defaulted (in contract) | contract 1 4
Recorded Investment $ 165 $ 3,128
Commercial and industrial    
Troubled Debt Restructurings    
Number of contracts, troubled restructurings (in contract) | contract 6 9
Pre-Modification Outstanding Recorded Investment $ 3,908 $ 10,282
Post-Modification Outstanding Recorded Investment $ 3,777 $ 9,235
Number of contracts, troubled debt restructurings subsequently defaulted (in contract) | contract 0 1
Recorded Investment $ 0 $ 2,000
Commercial real estate    
Troubled Debt Restructurings    
Number of contracts, troubled restructurings (in contract) | contract 2 2
Pre-Modification Outstanding Recorded Investment $ 228 $ 737
Post-Modification Outstanding Recorded Investment $ 218 $ 653
Number of contracts, troubled debt restructurings subsequently defaulted (in contract) | contract 1 2
Recorded Investment $ 165 $ 807
Commercial real estate | Commercial real estate    
Troubled Debt Restructurings    
Number of contracts, troubled restructurings (in contract) | contract 1 1
Pre-Modification Outstanding Recorded Investment $ 196 $ 177
Post-Modification Outstanding Recorded Investment $ 195 $ 173
Commercial real estate | Construction    
Troubled Debt Restructurings    
Number of contracts, troubled restructurings (in contract) | contract 1 1
Pre-Modification Outstanding Recorded Investment $ 32 $ 560
Post-Modification Outstanding Recorded Investment $ 23 $ 480
Residential mortgage    
Troubled Debt Restructurings    
Number of contracts, troubled restructurings (in contract) | contract 3 3
Pre-Modification Outstanding Recorded Investment $ 587 $ 621
Post-Modification Outstanding Recorded Investment $ 581 $ 622
Number of contracts, troubled debt restructurings subsequently defaulted (in contract) | contract 0 1
Recorded Investment $ 0 $ 321
Consumer    
Troubled Debt Restructurings    
Number of contracts, troubled restructurings (in contract) | contract 1 0
Pre-Modification Outstanding Recorded Investment $ 88 $ 0
Post-Modification Outstanding Recorded Investment $ 86 $ 0