Quarterly report pursuant to Section 13 or 15(d)

Loans and Leases - Additional Information (Detail)

v3.19.3
Loans and Leases - Additional Information (Detail)
 6 Months Ended
Jun. 30, 2019
USD ($)
SecurityLoan
Dec. 31, 2018
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accrued interest receivable $ 12,946,000 $ 13,331,000
Loans and leases receivable pledged to secure advances 1,200,000,000 1,100,000,000
Loans and leases 90 days or more past due and still accruing 0 4,000
Commitments to lend additional funds to borrowers whose loans are impaired 0 0
TDR loans receivable $ 47,100,000 10,300,000
Principal and interest due 3 months  
Reserves relating to loans included in allowance for loan losses $ 15,900,000 313,000
Increase in allowance 15,700,000  
Loans and lease receivables    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accrued interest receivable 11,200,000 $ 10,900,000
Real estate loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans modified within last twelve months $ 30,300,000  
Number of loans modified within last twelve months | SecurityLoan 7  
Commercial and industrial loans    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans modified within last twelve months $ 12,700,000  
Number of loans modified within last twelve months | SecurityLoan 1