XML 120 R97.htm IDEA: XBRL DOCUMENT v3.6.0.2
Commitments (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Commitments to extend credit    
Schedule of Commitments [Line Items]    
Off-balance sheet financial instruments, contractual amounts $ 1,075,170 $ 1,140,028
Letters of credit    
Schedule of Commitments [Line Items]    
Off-balance sheet financial instruments, contractual amounts $ 78,954 54,648
Letters of credit | Minimum    
Schedule of Commitments [Line Items]    
Remaining term 1 month  
Letters of credit | Maximum    
Schedule of Commitments [Line Items]    
Remaining term 4 years 9 months  
Unadvanced Commitment on Impaired Loan    
Schedule of Commitments [Line Items]    
Estimated losses attributable to unadvanced commitments on impaired loans $ 300  
Fixed Rate Loan Commitment | Commitments to extend credit    
Schedule of Commitments [Line Items]    
Off-balance sheet financial instruments, contractual amounts $ 89,700 $ 93,900