Annual report pursuant to Section 13 and 15(d)

Loans and Leases - Additional Information (Detail)

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Loans and Leases - Additional Information (Detail)
 12 Months Ended
Dec. 31, 2018
USD ($)
Property
Dec. 31, 2017
USD ($)
Property
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases receivable $ 4,600,540,000 $ 4,304,458,000
Accrued interest receivable 13,331,000 12,770,000
Loans pledged to secure advances from the FHLB $ 1,100,000,000 $ 1,100,000,000
Number of real estate properties | Property 7 6
Net carrying value of other real estate property $ 663,000 $ 1,946,000
TDR loans receivable $ 10,300,000 15,400,000
Principal and interest due 6 months  
Reserves relating to loans included in allowance for loan losses $ 313,000 2,200,000
Loans 90 days or more past due and still accruing 4,000 0
Home equity lines of credit    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Loans and leases receivable 10,300,000 14,200,000
Loans and leases receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accrued interest receivable $ 10,900,000 $ 10,200,000